Perception4 - PSC100Y Introduction to Cognitive Psychology...

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© S. J. Luck All rights reserved 1 PSC100Y Introduction to Cognitive Psychology Perception 4-1 Perception 4 – Face Perception Eye Eye Next To Nose Mouth Above and to the Left Above and to the Right Directly Above Faces gave the same basic parts in the same categorical positions, so they have the same geon structural description. Faces differ in metric properties: the exact sizes and shapes of the parts and the relative distances among them. Guitar Backpack Face Basic-Level Categorization Recognition by Components theory explained how we do basic- level categorization PRS Custom 22 ‘56 Strat Subordinate-Level Categorization It is not designed to explain how we differentiate between two members of the same category.
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© S. J. Luck All rights reserved 2 Subordinate-Level Categorization Categorizing faces is subordinate-level categorization. We do this using the metric properties of the faces. Holistic Perception of Faces Faces are perceived and stored holistically, meaning we do not store individual parts. We also store metric relationships among parts and other overall parts. Holistic Perception of Faces It is difficult to perceive the face when it is inverted. Holistic Perception of Faces Inversion doesn’t have much of an impact on the identification of most other kinds of objects. For example, we can easily tell that the image on the left is a cat and the image on the right is a dog. The highly specific impairment of face perception produced by inversion is called the “face inversion effect.” Thompson (1980) Thatcherization When the face is upside down, it is difficult to see the transformation.
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© S. J. Luck All rights reserved 3 PSC100Y Introduction to Cognitive Psychology Perception 4-2 Charlie Gross Charlie Gross did single unit recordings from inferotemporal (IT) cortex of the rhesus monkey. Charlie Gross Gross (2008) Recordings show that the cell strongly responded to various hands and a bit to an oven mitt, but not to other stimuli. Desimone, Albright, Gross, & Bruce. (1984) This cell gives a big response to monkey and human faces, but if you scramble the face, the cell doesn’t respond very much. Allison et al. (1999) It is also possible to record face-specific ERP responses from the surface of the cortex in humans. This is usually done in people who have epilepsy that does not respond to anti-seizure medication. The goal is to figure out exactly where the seizure is coming from so that that part of the brain can be removed.
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© S. J. Luck All rights reserved 4 Allison et al. (1999) In this study, they recorded activity while subjects looked at various stimuli such as cars, faces, scenes, words, and numbers. The dark line shows the ERP elicited from the cortical surface to faces, which contains a very large response around 200 ms after onset.
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