Lecture 2

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Department
Psychology
Course
Psychology 2220A/B
Professor
Scott Mac Dougall- Shackleton
Semester
Winter

Description
Psych 2220B LECTURE 2January 19 2012 Converging OperationsEvidence get better answers by using multiple approaches to address a single question EXAMPLE Korsakoffs syndrome characterized by severe memory loss most often seen in severe alcoholics y Is Korsakoffs a result of alcohol y Jimmie G Had K syndrome had never drank but was malnourishedy Thiaminedeficient rats also exhibit similar memory deficits which are a result of brain damage which is accelerated if rats are fed alcoholy Alcoholics may be malnourished and vitamindeficient o By exploring many possible causes aka converging operations findings were more accurateo Korsakoffs syndrome is a result of thiamine deficiency but the damage is accelerated by alcoholScientific Inference the empirical method that biopsychologists use to study the unobservable Measure what you can observe and use those measure as a basis for inferring what they cant observe EX how does the brain see movement We perceive movement in a very particular way the brain has to correct for the movement of the retinal image that isnt involved in the motion of objects from moving your head and eyes How does it separateinterpret internal movement head eyes versus external movement motion in the visual fieldwhat youre looking at y Brain sends signal to move eyes causing the retinal image to shift in the opposite direction Why At the same time you generate a motor signal to move your eyes you send a duplicat efference copy to your visual system so it knows your eyes are moving Then the visual system must compare what what was predict y When youre body generates a motor signal that is going to change your perception of the world your perceptual system receives a copy of those motor plans and thats why what you see stays still when moving your eyes or moving your heady What happens when something moves in the world while your eyes stay still There is motion in your visual field hwvr there is no efference copy causing prediction of motion in the visual field thfr when your eyes are still and objects are moving you perceive motion y What happens when you push on your eyeball There is motion in the visual field but the motion is not produced by something that would send an efference copy therefore the visual system doesnt predict motion yet the visual field is moving so you perceive that it is the outside world moving bc visual system lacks efference copy y What happens if your eye muscles are paralyzed
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