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PSYD50H3 (11)

PSYD50 notes 3.doc

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Jonathan Cant

Article#1: ACortical Area Selective for Visual Processing of the Human Body - Little research done on the mechanisms involved in perceiving the rest of the human body - Past research: semantic knowledge of human body parts may be distinct from knowledge of other object categories - functional neuroimaging studies have implicated regions of the superior temporal sulcus in the perception of biological motion. In monkeys, neurons in the STS that respond selectively to the appearance of the body, including the face. - This study reports evidence for a region in the human visual cortex selectively involved in processing the appearance of human bodies. Hypothesis: EBAis selectively involved in visual processing of the human body Method: participants (19) were scanned using fMRI - found a region in the right occipitotemporal cortex that produced a significantly stronger response when subjects viewed still photos of human bodies and body parts than when viewed inanimate objects and object parts. This part named “extra striate body area” (EBA) -measured the response of EBAto many visual stimuli Results: Experiment 1: response to human body parts and face parts were greater than object parts - whole faces lower than face parts and body parts Experiment 2: response to hands did not differ from assorted body parts - response to body parts was greater than object parts ( line drawing or photographs) Experiment 3: response to human bodies was greater than human body parts ( which was greater than object parts) Experiment 4:greater response to entire bodies than to cars ( either line drawings or photographs) - The EBAresponds selectively to humans as opposed to animals - Study has successfully obtained data that justifies their hypothesis. They provided various experiments in their study displaying stimuli that justifies that the EBAselectively responds to the visual processing of the human body. - Further studies: - Find precise functional role of the EBA( for example, it may be involved in the identification of individuals) - ongoing studies suggest no other category- selective regions in occipitotemporal cortex. There are questions about whether the FFA, PPA, and the EBAare specified in the genome or if lifetime experience is involved in these regions. Article #2: Selectivity for the Human Body in the Fusiform Gyrus Past Research: - Fusiform face area (FFA) responds strongly and selectively to human faces as compared with other controls - bird and car experts show increased FFAactivity when viewing birds and cars. So FFAmay be a mechanism for distinguishing similar exemplars that the viewer is an expert on. - some argue that this region has no special functional role- just neural network that represents objects by feature analyzers - debates on the organization of ventral stream object representations - response to bodies, the FFAresponse is greater here than with objects but lower than to faces Hypothesis: human bodies, even without faces, may be represented in the human mid-fusiform gyrus Methods:- 22 adult volunteers for the first experiment, 8 subjects for the second - Experiment 1: consisted of images of faces, human bodies witho
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