Have you ever heard someone make an argument that leaves you shaking your head in disbelief?  Does it seem to you like some people are coming from a completely different reality than your own?  If so, then this blog is for you.  I have spent the last year trying to develop an understanding of the common thought patterns that drive the acrimonious spirit of our social and political dialogue.  I am continually amazed by what I hear coming from seemingly informed people.  I have assumed that some folks are either deluded, disingenuous, or downright ignorant.  There is yet another possibility here, including the reality that different moral schema or belief systems may be driving their thinking.  And if this is the case, how do these divergent processes come to be?  I  have learned a lot through this exploration and feel compelled do provide a recap of the posts I have made.  I want to share with you those posts that have gathered the most traction and some that I believe warrant a bit more attention.


Over the past year I have posted 52 articles often dealing with Erroneous Thought Processes, Intuitive Thinking, and Rational Thought.  Additionally, I have explored the down stream implications of these processes with regard to politics, morality, religion, parenting, memory, willpower, and general perception.  I have attempted to be evidenced-based and objective in this process – striving to avoid the very trappings of confirmation bias and the erroneous processes that I am trying to understand.   As it turns out, the brain is very complicated: and although it is the single most amazing system known to human kind, it can and does lead us astray in very surprising and alarming ways.


As for this blog, the top ten posts, based on the shear number of hits, are as follows:

  1. Attribution Error
  2. Nonmoral Nature, It is what it is.
  3. Multitasking: The Illusion of Efficacy
  4. Moral Instinct
  5. Pareidolia
  6. IAT: Questions of Reliability
  7. Are You a Hedgehog or a Fox?
  8. What Plato, Descartes, and Kant Got Wrong: Reason Does not Rule
  9. Illusion of Punditry
  10. Emotion vs.Reason: And the winner is?

What started out as ramblings from a curious guy in a remote corner of New York State ended up being read by folks from all over the planet.  It has been a difficult process at times, consuming huge amounts of time, but it has also been exhilarating and deeply fulfilling.


I have been heavily influenced by several scientists and authors in this exploration.  Of particular importance have been Steven Pinker, Daniel Simons, Christopher Chabris, Jonah Lehrer, Bruce Hood, Carl Sagan, and Malcolm Gladwell.  Exploring the combined works of these men has been full of twists and turns that in some cases necessitated deep re-evaluation of long held beliefs.  Holding myself to important standards – valuing evidence over ideology – has been an important and guiding theme.


Several important concepts have floated to the top as I poked through the diverse literature pertaining to thought processes. Of critical importance has been the realization that what we have, when it comes to our thought processes, is a highly developed yet deeply flawed system that has been shaped by natural selection over millions of years of evolution.  Also important has been my increased understanding of the importance of genes, the basic element of selective pressures, as they play out in morality and political/religious beliefs.  These issues are covered in the top ten posts listed above.


There are other worthy posts that did not garner as much attention as those listed above.  Some of my other favorites included a review of Steven Pinker’s article in the New York Times (also titled Moral Instinct,) a look at Jonathon Haidt’s Moral Foundations Theory in Political Divide, as well as the tricks of Retail Mind Manipulation and the Illusion of Attention.  This latter post and my series on Vaccines and Autism (Part 1, Part 2, Part 3) were perhaps the most important of the lot.  Having the content of these become general knowledge would make the world a safer place.


The evolution of understanding regarding the power and importance of Intuitive relative to Rational Thinking was humbling at times and Daniel Simons’ and Christopher Chabris’ book, The Invisible Gorilla, certainly provided a mind opening experience.  Hey, our intuitive capabilities are incredible (as illustrated by Gladwell in Blink & Lehrer in How We Decide) but the downfalls are amazingly humbling.  I’ve covered other topics such as  happiness, superstition, placebos, and the debate over human nature.


The human brain, no matter how remarkable, is flawed in two fundamental ways.  First, the proclivities toward patternicity (pareidolia), hyperactive agency detection, and superstition, although once adaptive mechanisms, now lead to many errors of thought.  Since the age of enlightenment, when human kind developed the scientific method, we have exponentially expanded our knowledge base regarding the workings of the world and the universe.  These leaps of knowledge have rendered those error prone proclivities unessential for survival.  Regardless, they have remained a dominant cognitive force.  Although our intuition and rapid cognitions have sustained us, and in some ways still do, the everyday illusions impede us in important ways.


Secondly, we are prone to a multitude of cognitive biases that diminish and narrow our capacity to truly understand the world. Time after time I have written of the dangers of ideology with regard to its capacity to put blind-folds on adherents.  Often the blind- folds are absolutely essential to sustain the ideology.  And this is dangerous when truths and facts are denied or innocents are subjugated or brutalized.  As I discussed in Spinoza’s Conjecture“We all look at the world through our personal lenses of experience.  Our experiences shape our understanding of the world, and ultimately our understanding of [it], then filters what we take in.  The end result is that we may reject or ignore new and important information simply because it does not conform to our previously held beliefs.


Because of our genetically inscribed tendencies toward mysticism and gullibility, we must make extra effort in order to find truth. As Dr. Steven Novella once wrote:

“We must realize that the default mode of human psychology is to grab onto comforting beliefs for purely emotional reasons, and then justify those beliefs to ourselves with post-hoc rationalizations. It takes effort to rise above this tendency, to step back from our beliefs and our emotional connection to conclusions and focus on the process.”

We must therefore be humble with regard to beliefs and be willing to accept that we are vulnerable to error prone influences outside our awareness.  Recognition and acceptance of these proclivities are important first steps.   Are you ready to move forward?  How do you think?


There are many well intentioned folks out there who believe that childhood vaccinations cause Autism. Last week I covered the origins of this belief system as well as its subsequent debunking in Vaccines and Autism. Despite the conclusive data that clearly establishes no causal link between vaccines and Autism, the belief lives on. Why is this? Why do smart people fall prey to such illusions? Chabris and Simons contend in their book, The Invisible Gorilla, that we fall prey to such myths because of the Illusion of Cause. Michael Shermer (2000), in his book, How We Believe, eloquently describes our brains as a Belief Engine. Underlying this apt metaphor is the notion that “Humans evolved to be skilled pattern seeking creatures. Those who were best at finding patterns (standing upwind of game animals is bad for the hunt, cow manure is good for the crops) left behind the most offspring. We are their descendants.” (Shermer, p. 38). Chabris and Simons note that this refined ability “serves us well, enabling us to draw conclusions in seconds (or milliseconds) that would take minutes or hours if we had to rely on laborious logical calculations.” (p. 154). However, it is important to understand that we are all prone to drawing erroneous connections between stimuli in the environment and notable outcomes. Shermer further contends that “The problem in seeking and finding patterns is knowing which ones are meaningful and which ones are not.


From an evolutionary perspective, we have thrived in part, as a result of our tendency to infer cause or agency regardless of the reality of threat. For example, those who assumed that rustling in the bushes was a tiger (when it was just wind) were more likely to take precautions and thus less likely, in general, to succumb to predation. Those who were inclined to ignore such stimuli were more likely to later get eaten when in fact the rustling was a hungry predator. Clearly from a survival perspective, it is best to infer agency and run away rather than become lunch meat. The problem that Shermer refers to regarding this system is that we are subsequently inclined toward mystical and superstitious beliefs: giving agency to unworthy stimuli or drawing causal connections that do not exist. Dr. Steven Novella, a neurologist, in his blog post entitled Hyperactive Agency Detection notes that humans vary in the degree to which they assign agency. Some of us have Hyperactive Agency Detection Devices (HADD) and as such, are more prone to superstitious thinking, conspiratorial thinking, and more mystical thinking. It is important to understand as Shermer (2000) makes clear:


“The Belief Engine is real. It is normal. It is in all of us. Stuart Vyse [a research psychologist] shows for example, that superstition is not a form of psychopathology or abnormal behavior; it is not limited to traditional cultures; it is not restricted to race, religion, or nationality; nor is it only a product of people of low intelligence or lacking education. …all humans possess it because it is part of our nature, built into our neuronal mainframe.” (p. 47).


We all are inclined to detect patterns where there are none. Shermer refers to this tendency as patternicity. It is also called pareidolia. I’ve previously discussed this innate tendency noting that “Our brains do not tolerate vague or obscure stimuli very well. We have an innate tendency to perceive clear and distinct images within such extemporaneous stimuli.” It is precisely what leads us to see familiar and improbable shapes in puffy cumulus clouds or the Virgin Mary in a toasted cheese sandwich. Although this tendency can be fun, it can also lead to faulty and sometimes dangerous conclusions. And what is even worse is that when we hold a belief, we are even more prone to perceive patterns that are consistent with or confirm that belief. We are all prone to Confirmation Bias – an inclination to take in, and accept as true, information that supports our belief systems and miss, ignore, or discount information that runs contrary to our beliefs.


Patternicity and confirmation bias alone are not the only factors that contribute to the illusion of cause. There are at least two other equally salient intuitive inclinations that lead us astray. First, we tend to infer causation based on correlation. And second, the appeal of chronology, or the coincidence of timing, also leads us toward drawing such causal connections (Chabris & Simons, 2010).


A fundamental rule in science and statistics is that correlation does not infer causation. Just because two events occur in close temporal proximity, does not mean that one leads to the other. Chabris and Simons note that this rule is in place because our brains automatically – intuitively – draw causal associations, without any rational thought. We know that causation leads to correlation – but it is erroneous to assume that the opposite is true. Just because A and B occur together does not mean A causes B or vice-versa. There may be a third factor, C, that is responsible for both A and B. Chabris and Simons use ice cream consumption and drownings as an example. There is a sizable positive correlation between these two variables (as ice cream consumption goes up so do the incidences of drowning), but it would be silly to assume that ice cream consumption causes drowning, or that increases in the number of drownings causes increases in ice cream consumption. Obviously, a third factor, summer heat, leads to both more ice cream consumption and more swimming. With more swimming behavior there are more incidents of drowning.


Likewise, with vaccines and Autism, although there may be a correlation between the two (increases in the number of children vaccinated and increases in the number of Autism diagnoses), it is incidental, simply a coincidental relationship. But given our proclivity to draw inferences based on correlation, it is easy to see why people would be mislead by this relationship.


Add to this the chronology of the provision of the MMR vaccine (recommended between 12 and 18 months), and the typical time at which the most prevalent symptoms of Autism become evident (18-24 months), people are bound to infer causation. Given the fact that millions of children are vaccinated each year, there are bound to be examples of tight chronology.


So what is at work here are hyperactive agency detection (or overzealous patternicity), an inherent disposition to infer causality from correlation, and a propensity to “interpret events that happened earlier as the causes of events that happened or appeared to happen later” (Chabris & Simons, 2010, p. 184).  Additionally, you have a doctor like Andrew Wakefield misrepresenting data in such a way to solidify plausibility and celebrities like Jenny McCarthy using powerful anecdotes to convince others of the perceived link. And anecdotes are powerful indeed. “..[W]e naturally generalize from one example to the population as a whole, and our memories for such inferences are inherently sticky. Individual examples lodge in our minds, but statistics and averages do not. And it makes sense that anecdotes are compelling to us. Our brains evolved under conditions in which the only evidence available to us was what we experienced ourselves and what we heard from trusted others. Our ancestors lacked access to huge data sets, statistics, and experimental methods. By necessity, we learned from specific examples…” (Chabris & Simons, 2010, pp. 177-178).  When an emotional mother (Jenny McCarthy) is given a very popular stage (The Oprah Winfrey Show) and tells a compelling story, people buy it – intuitively – regardless of the veracity of the story. And when we empathize with others, particularly those in pain, we tend to become even less critical of the message conveyed (Chabris & Simons, 2010). These authors add that “Even in the face of overwhelming scientific evidence and statistics culled from studies of hundreds of thousands of people, that one personalized case carries undue influence” (p.178).


Although the efficacy of science is unquestionable, in terms of answering questions like the veracity of the relationship between vaccines and Autism, it appears that many people are incapable of accepting the reality of scientific inquiry (Chabris & Simons, 2010). Acceptance necessitates the arduous application of reason and the rejection of the influences rendered by the intuitive portion of our brain. This is harder than one might think. Again, it comes down to evolution. Although the ability to infer cause is a relatively recent development, we hominids are actually pretty good at it. And perhaps, in cases such as this one, we are too proficient for our own good (Chabris & Simons, 2010).




Center for Disease Control. (2009). Recommended Immunization Schedule for Persons Aged 0 Through 6 Years. http://www.cdc.gov/vaccines/recs/schedules/downloads/child/2009/09_0-6yrs_schedule_pr.pdf


Chabris, C. F., & Simons, D. J. (2010). The Invisible Gorilla. Random House: New York.


Novella, S. (2010). Hyperactive Agency Detection. NeuroLogica Blog. http://www.theness.com/neurologicablog/?p=1762


Shermer, M. (2000). How We Believe. W.H. Freeman / Henry Holt and Company: New York.


Vaccines and Autism

13 August 2010

It is hard to imagine anything more precious than one’s newborn child. Part of the joy of raising a child is the corresponding hope one has for the future. Don’t we all wish for our children a life less fraught with the angst and struggles we ourselves endured? One of the less pleasant aspects of my job has the effect, at least temporarily, of robbing parents of that hope. This erosion occurs in the parent’s mind and heart as a consequence of a diagnosis I often have to provide. I am a psychologist employed in part to provide diagnostic evaluations of preschool age children suspected of having Autism. My intention is never to crush hope, instead it is to get the child on the right therapeutic path as early as possible in order to sustain as much hope as possible. However, uttering the word AUTISM in reference to one’s child constitutes a serious and devastating emotional blow.


Many parents come to my office very aware of their child’s challenges and the subsequent implications. They love their child, accept him as he is, and just want to do whatever they can to make his life better. Others come still steeped in hope that their child’s challenges are just a phase or believing that she is just fine. Regardless, most of them report that they suspected difficulties very early in the child’s development. For example, many note a lack of smiles, chronic agitation and difficulty soothing their child. Some children had not been calmed by being held or may have even resisted it. Some other children I see develop quite typically. They smile, giggle, rejoice at being held, coo and babble, and ultimately start to use a few words with communicative intent. The parents of this latter and rather rare subset, then watch in dismay as their child withdraws, often losing both functional communication and interest in other children.


The timing of this developmental back-slide most often occurs at around 18 months of age. This regression happens to coincide with the recommended timing of the provision of the Measles-Mumps-Rubella (MMR) vaccine. This temporal chronology is important as it has lead, in part, to a belief that the vaccine itself is responsible for the development of Autism. What these parents must experience at this time, I can only imagine, is a horrible combination of confusion and grief. They have had their hopes encouraged and reinforced only to have them vanquished. And it is human nature, under such circumstances, to look for a direct cause. It makes perfect sense that parents would, given the chronicity of events in some cases, suspect the MMR vaccine as the cause of their child’s regression.


During my occasional community talks on Autism, I often am asked about the alleged connection between vaccines and Autism. The coincidental temporal relationship between the provision of the MMR vaccine and this developmental decay leads to what Chabris and Simons in The Invisible Gorilla refer to as the Illusion of Cause. Chabris and Simons discuss how “chronologies or mere sequences of happenings” lead to the inference “that earlier events must have caused the later ones.” (2010, p. 165). By default, as a result of evolution, our brains automatically infer causal explanations based on temporal associations (Chabris & Simons, 2010).


At nearly every talk I give, there is someone in the audience who is convinced that their child (or a relative) is a victim of the MMR vaccine. Their compelling anecdotes are very difficult to refute or discuss. I find that the application of reason, or data, or both, misses the mark and comes off as being cold and insensitive.


For such causal relationships to endure and spread they often need some confirmation of the effect by an “expert.” This is where the story of Dr. Andrew Wakefield comes into play. Wakefield, a GI Surgeon from the UK published a paper in the prestigious UK medical journal, The Lancet, alleging a relationship between the MMR vaccine and the development of Autism. His “expert” opinion offered legitimacy to already brewing suspicions backed by the perceived correlates of increases in both vaccination and Autism rates, as well as the apparent chronology between the timing of the vaccines and the onset of Autism. Wakefield provided credibility and sufficient plausibility: and as a result, the news of the alleged relationship gained traction.


But hold on! There were major flaws with Wakefield’s study that were not initially detected by The Lancet’s peer review panel. First of all, Wakefield was hired and funded by a personal injury attorney who commissioned him to prove that the MMR vaccine had harmed his clients (caused Autism). His study was not designed to test a hypothesis: it was carried out with the specific objective of positively establishing a link between Autism and provision of the MMR vaccine. From the outset the study was a ruse, disguised as science.


Just this year (2010), 12 years after the initial publication of Wakefield’s infamous study, The Lancet retracted it and Dr. Wakefield has been stripped of his privilege to practice medicine in the UK. Problems however, surfaced years ago: as early as 2004, when 10 of 13 co-authors retracted their support of a causal link. In 2005 it was alleged that Wakefield had fabricated data – in fact, some of the afflicted children used to establish the causal link had never actually received the MMR vaccine!


Since the initial publication of this study, hundreds of millions of dollars have been spent investigating the purported relationship between vaccines and Autism. Despite extensive large scale epidemiological studies, there have been no replications of Wakefield’s findings. Children who had not been vaccinated developed Autism at the same rate as those who had received the MMR. There is no relationship between the MMR vaccine and the development of Autism. As a result of Wakefield’s greed, hundreds of millions of dollars have been wasted. Those dollars could have been devoted to more legitimate pursuits, and that is not the worst of it. I will get to the real costs in a bit.


Another aspect of the history of this controversy is associated with the use of thimerosal as a preservative in vaccines. This notion, which has also been debunked, gained plausibility because thimerosal contains mercury, a known neurotoxin. You may ask: “Why on earth would a neurotoxin be used in vaccines?” Researchers have clearly established that thimerosal poses no credible threat to humans at the dosage levels used in vaccines. However, given the perceived threat, Thimerosal is no longer used as a preservative in routine childhood vaccinations. In fact, the last doses using this preservative were produced in 1999 and expired in 2001. Regardless, the prevalence of autism seems to be rising.


It is important to understand that mercury can and does adversely affect neurological development and functioning. However, long term exposure at substantially higher doses than present in thimerosal are necessary for such impact. The mercury in thimerosal is ethyl-mercury, which is not fat-soluble. Unlike the fat-soluble form of methyl-mercury (industrial mercury), ethyl-mercury is flushed from the body very quickly. Methyl-mercury can be readily absorbed into fatty brain tissue and render its damage through protracted contact. Methyl-mercury works its way into the food chain and poses a hazard to us if we eat too much fish (particularly those at the high end of the food chain). In reality, one is at more risk from eating too much seafood (shark and tuna) than from getting an injection of a vaccine preserved with thimerosal. Yet there does not seem to be a movement to implicate seafood as the cause of Autism.


Even though the relationship between vaccines and Autism has been thoroughly debunked, there is a movement afoot, steeped in conspiratorial thinking, that alleges that “Big Pharmacy” and the “Government” are colluding to deceive the people and that elaborately fabricated data is used to cover up a relationship. This belief lives on. How can this be so? Even intelligent and well educated people I know are avoiding important childhood immunizations based on the fear and misinformation spread by these well intentioned people.


In 2003, in the UK, the MMR vaccine rate had fallen to below 79% whereas a 95% rate is necessary to maintain herd immunity. Currently, the vaccine rates are dropping in the US due to the efforts of celebrities like Jenny McCarthy who purports that her son’s Autism was caused by vaccines. McCarthy campaigns fiercely against childhood immunizations spurred on by the likes of Oprah Winfrey. Even folks like John McCain, Joe Lieberman, and Robert F. Kennedy, Jr have spread such misinformation. Continuing to contend that the MMR vaccine is the culprit, Wakefield has moved to the US and has risen to martyr status among the anti-vaccine folk. You need to know that just months before he published his seminal paper, Wakefield received a patent on a Measles Vaccine that he alleges, “cures” Autism. He has much to gain financially, in his attempt to scare people away from the current safe and effective MMR vaccine.


It amazes me that people do not automatically dismiss this alleged vaccine-Autism link. Wakefield’s conflict of interest and discredited research practices alone draw into question anything he has to say. The mountains of epidemiological evidence also favors rejection of a causal relationship between the MMR vaccine and Autism. However, the power of anecdotes and misguided beliefs place millions of children in harm’s way.


Imagine yourself as a parent of a child who cannot get the MMR vaccine because of a serious medical condition (e.g., cancer). Such vulnerable children, of which there are millions worldwide, depend on herd immunity for their very survival. Now imagine that your child is inadvertently exposed to measles by coming into contact with a child who wasn’t vaccinated (because of misguided parental fear). Because your child’s compromised immunity, she develops the measles and gets seriously ill or dies. Such a scenario, although improbable is not impossible. It is more likely today largely due to the diminished herd immunity caused by misinformation. Whooping Cough (Pertussis) is likewise posing serious concerns (and one documented death) in unvaccinated clusters because of the anti-vaccine folk. This myth persists, in part, because of the Illusion of Cause, and the consequences have become deadly. Next week I will delve into this Illusion that sustains this erroneous and dangerous belief system.




Association for Science in Autism Treatment. (2009).  Autism & Vaccines: The Evidence to Date. Vol. 6., No. 1 http://www.asatonline.org/pdf/summer2009.pdf


Center for Disease Control. Autism Spectrum Disorders: Data & Statistics. http://www.cdc.gov/ncbddd/autism/data.html


Chabris, C. F., & Simons, D. J. (2010).  The Invisible Gorilla. Random House: New York.


Plait, P. (2010). The Australian antivax movement takes its toll. Bad Astronomy Blog. http://blogs.discovermagazine.com/badastronomy/2009/04/26/the-australian-antivax-movement-takes-its-toll/


In psychology there are some pretty famous studies that have penetrated popular culture. Many folks are at least familiar with Skinner’s rat box, Pavlov’s salivating dogs, Milgram’s obedience studies, Bandura’s Bobo Dolls, and Harlow’s rhesus monkeys reared by wire frame terry cloth mothers. In recent history, perhaps the most well known study pertains to inattentional blindness. If you have never heard of or seen a video of six college students, three in black shirts and three in white shirts, bouncing a couple basketballs back and forth, see the following video before you proceed.



So, of course I am referring to Daniel Simons’ Invisible Gorilla study. Just about everyone I know has seen this video, and I don’t recall any of them telling me that they did see the gorilla. I didn’t and I was absolutely flabbergasted – because I tend to be a pretty vigilant guy. This video is a graphic illustration of what Chabris and Simons (2010) refer to as the Illusion of Attention, and about 50% of those who watch the video while counting passes among white shirted players miss the gorilla.


This particular illusion concerns me because I spend a fare amount of time riding a bicycle on the roads of Western New York. So why should I or anyone who rides a bicycle or motorcycle, or anyone who drives while texting or talking on a cell phone be concerned?


The cold hard truth is that we may completely miss events or stimuli that we do not expect to see. If you don’t expect to see, and therefore fail to look for, bicycles and motorcycles, you may look right at them but fail to see them. LOOKING IS NOT SEEING just as hearing is not listening. This hearing/listening analogy is dead on.  How often have you been caught hearing someone but not listening to what was actually being said?  Chabris and Simons discuss in their book, The Invisible Gorilla, a study conducted by Daniel Memmert of Heidelberg University that demonstrated (using an eye-tracker) that virtually everyone who missed the gorilla looked directly at it at some point in the video (often for a full second). Bikers are the invisible gorillas of the roadways.


And as for drivers, if you are distracted by a cell phone conversation or by texting, you are less likely to see unexpected events (e.g., bicycles, motorcycles, pedestrians, wildlife).


Most drivers who text and talk on cell phones do not have problems. In fact, most driving is uneventful – as a result, most people get away with these behaviors. However, it is when there is an unexpected event that mobile phone users struggle with seeing and responding fluently to these events. You are under the same illusion as everybody else who has not been in an accident. Everyone believes, until they hit or kill somebody, that they are proficient drivers even while texting or talking on the phone.  And by the way, hands free head sets make no difference. Driving while talking on a cell phone disables you as much as does alcohol.


Think about driving down a road not seeing and subsequently hitting a young child on a bike. Think about having to live with killing a middle aged couple with three kids in college who were lawfully riding down the road on a tandem bicycle.  You hit the invisible gorilla.  Live with that!


Daniel Simons, in a recently published study, also suggests that even if you are expecting an unexpected event,  it is likely that you will miss other unanticipated events. Check out The Monkey Business Illusion video even if you have seen the invisible gorilla video. Test yourself.



I have long known that I am at risk while riding my bike on the road.  I have recently incorporated wearing bright hi-vis attire as I ride.  Doing so is completely inconsistent with my style; but I have done so in an effort to be safer.  I was surprised to learn that research shows that doing so will increase your visibility for those that are looking for you – but that it will likely make no difference at all for inattentionally blind drivers. For those drivers who do not expect to see cyclists, hi-vis clothing will not likely increase the likelihood that you will be seen.  Using head and tail lights works on a similar level.  They do increase visibility but only for those looking for such strange sights.  The best way to increase one’s safety while riding is to look like a car.


It is also important to note that riding in areas where there are more bikers helps too. Chabris and Simons (2010) noted a report by Peter Jacobson, a public health consultant in California who analyzed data on accidents involving automobiles striking pedestrians or cyclists. He found that in cities where there were more walkers and cyclists, there were actually fewer accidents. More folks walking or riding bikes seems to increase the level of driver expectation for seeing such individuals – thus making one less at risk of being victimized by inattentional blindness. It was further noted that drivers who also ride bikes may actually be more aware – if only more people would get out of their cars and get back on bicycles.


The bottom line is that our intuition about our attention is problematic. Intuitively we believe that we attend to and see, what is right before us. Research and real world data shows us that this is not the case. At the very least, when driving, we need to be aware of this erroneous assumption, and work diligently to avoid distractions like talking on the phone or texting. As for cyclists (motor powered or not) we must anticipate that we won’t be seen and behave accordingly. Although hi-vis clothing and lights may not aid in your visibility for some drivers, it will for those that are looking out for you.


Chabris and Simons contend that this illusion is a by product of modernity and the subsequent fast paced highly distracting world we live in. We have evolved for millions of years by process of natural selection in a middle sized slow paced world. Traveling faster than a few miles an hour is a relatively new development for our species. Today we travel in motor vehicles at break neck speeds. On top of that we distract ourselves with cell phones, Blackberries, iPhones, iPods and GPS units. Although the consequences of these factors can be grave – in most cases we squeak by – which is a double edged sword because it essentially reinforces the illusion and the behavior.




Chabris, C. F., & Simons, D. J., 2010. The Invisible Gorilla. Random House: New York.


Simons, D. J., 2010. Monkeying around with the gorillas in our midst: familiarity with an inattentional-blindness task does not improve the detection of unexpected events i-Perception 1(1) 3–6