One tool to study perception are apparent failures of

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One tool to study perception are apparent failures of visual system to do a vertical or truthful representation o Rotating snake solution – you see spinning disc, brain knows that there is no motion on the screen Eyes work hard to do is to determine if something is moving but doesn’t do it perfectly Illusion won’t work if you keep your eyes very still o Visual system has set of neurons that are built to try to find motion Use various tricks and heuristics like subtle changes in space, brightness, and time
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It’s hard to keep your eyes still because our visual system makes incessant small eye movements o Hypothesis – brain is trying to keep your retina fresh and always changes its position in respect to the world Picture of hearts in background looks like there blue and green hearts o Only difference in hearts is where a certain colored patch is w/ respect to the other stripes in the patterns Same image but 1 heart is next to a red line while other heart is next to a pink line o Background consists of 2 different kinds of red or pink lines Take images that are the same, doctor them, and show those different images to the 2 eyes to get 3D images There are 2 general way to generate stereo images or 3D images o (1) Take real film w/ 2 cameras that are offset by some amount horizontally Mimics 2 eyes that are encountering the world o (2) Do animation – build a 3D world and virtually have cameras flying through it One thing that is missing in conventional 3D glasses is that you can’t see periphery since they’re glasses o Virtual reality does stereo glasses but bigger and wraps around the whole field of view Greatest success of perceptual science w/ respect to obvious clinical issues is strabismus & amblyopia o Perceptual deficits that persist for a long time if not caught early in childhood Lecture 7 – Brain Psychology in The News Brains begin to shrink about 5% every decade starting around 40 & even faster beyond 70 Super agers – people who retain their memory ability o Memory usually gets worse as we get older for most people o There’s a subset of people where their memory doesn’t really get worse Brains of super agers are still shrinking but at a far lower rate How the Brain is Structured Attention Deficit Hyperactivity Disorder (ADHD) Self-Rated Screening Questionnaire o ADHD is assessed thru detailed testing – survey is for general pop to see if additional testing is needed Localization – different parts of the brain are responsible for specific behaviors Franz Joseph Gall – founder of phrenology in 1700s o Since abilities are rooted in the brain, Gall believed that if you had a large amount of a certain ability, that part of the brain should be bigger – this would be associated w/ a lump on the skull o Everything Gall believed regarding lumps behind brain became discredited and proven not true Gall was right in the sense that different part of the brain does do different things in a very broad sense
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o Be skeptical of claims that say “This is THE part of the brain” for some high
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