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PSYD50H3 (11)

psyd50 week 7

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University of Toronto Scarborough
Jonathan Cant

Olivia Stewart 997418021 October 23, 2012 Summaries Article 1: A cortical area selective for visual processing of the human body; Downing, P.E., Jiang, Y., Shuman, M., & Kanwisher, N. (2001) -hypothesis: to report evidence for a brain region (the extrastriate body area EBA) in the human visual cortex that is selectively involved in processing the appearance of human bodies -used 19 subjects: pro fairly good number for an fMRI study, but con still not enough to be able to generalize across entire populations of people -showed black and white pictures as stimuli: pro good for generalizability across all stimuli (ie. no picture is more colourful than the next; no picture is more attention- grabbing than the next {bright colours, etc}) con black and white sometimes not enough for the attention seeking that you want the brain to carry out; want something that is interesting for the subject -made the claim that the EBA is selective for processing visual images of human bodies and body parts, but not faces  findings support it because all 19/19 subjects EBA’s activated when given the same stimuli -many theories about which brain areas activate for faces (ie. research on the FFA) but not as many on what parts activate for human bodies -this research helped demonstrate that the brain does have areas that select for bodies pro good because it helps set ground work for discovering more about what the brain and its parts are selective for con now more research needs to be done to find out ‘why’ this happens -in the future, could figure out why our brain is selective for bodies  how does this affect us evolutionarily? is this something that we need to survive? -do specific areas activate for animal bodies as well? -why are the regions for face and body separate? what could this mean? Article 2: Selectivity for the human body in the fusiform gyrus. Peelen, M.V., & Downing, P.E. (2004). -hypothesis: to show that human bodies are selected for in the human mid-fusiform gyrus -1 experiment: -22 participants: pro: good number, but con: still not enough to generalize across populations -showed pics of faces, bodies without heads, outdoor scenes, and hand tools -used 1.5 Philips MRI scanner with a SENSE parallel head coil nd -for functional imaging, an EPI sequence was used -2 experiment: -same MRI equipment used as above -8 subjects: again, simply not enough; difficult because of time and money for fMRI studies -showed 15 stick figures and 15 scrambled items for baseline pro good for control to get a baseline con bad because could induce boredom in subjects; more money and time spent -con: could have scanned at higher
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