PSYC 215 Lecture Notes - Lecture 19: Visual System, Visual Cortex, Mental Rotation
29 May 2018
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• Mental rotation - task
• measurements of spatial transformation of the mental models of novel, geometric
forms
• EXP: Subjects asked to determine as quickly as possible if they were the same
or diff object - 3D shapes
• Found a strictly linear relationship between angular difference between
the 2 objects and RT
• Kosslyn says this is proof for depictive theory
• Image inspection (“image-scanning task”)
• Kosslyn and colleagues (1978)
• Had subject memorize a fictional map and then redraw it to make sure they
memorized it
•
• “Image black speck moving from straw hut to well” then press key
• If really scanning eyes as if you were drawing-- this is depictive theory
• If it is language based and it takes same amount of time-- propositional
theory
• Results: distance scanned in a mental image is directly related to the time
it takes to complete the scan
• Image inspection (“image SIZE task”)
• Kosslyn and colleagues
• It is difficult to perceive parts of an object if its retinal size is small
• Would it also be difficult to discern info in a visual image if its size is
small?
• TASK:
• Imagine a goose and an elephant
• Imagine a goose and a fly
• It took subjects much longer to identify a part of the goose when it was imagined
next to an elephant
• Mental rotation/scanning: Depictive theories
• Visual mental images preserve spatial relations and structural properties
• Mental rotation
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