Lecture 7 - Jan 27

Lecture 7 - Jan 27 - Last Week WebCT Questions: Visual...

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Last Week WebCT Questions: Visual agnosia and visual imagery -read the article posted in Discussions on Web CT Good continuation -perceive lines Single vs. Double dissociations Single dissociation: damage to a specific brain area leads to damage in certain performances GroupFace PerceptionPlace Perception FFA DamageDisruptedIntactControlsIntactIntact Double dissociations: gives us more confidence in making a the causal connection between brain area and facial processing GroupFace PerceptionPlace Perception FFA DamageDisruptedIntactPPA ControlsIntactDisruptedControlsIntactIntactReversible lesions ERP Components -lines, run in time (rather than space) -more confusing Averaged ERP Waveform (picture in our lectures) SHAPE \* MERGEFORMAT Overview -Defining attention -Properties of attentional selection -Varieties of attention -How to measure attention? -Neuropsychological disorders -Brain mechanisms of attention How to measure attention? In the lab: overt/covert orienting [overt-measure with some sort of technology (where our eyes are positioned)] =last class -Regardless of that, measurements mostly depend on chronometric measures (variables such as response time, and/or accuracy) RT: Attended RT < Unattended RT -how fast does it take our eyes to get there? similar to overt/covert RT Accuracy: Attended accuracy > Unattended accuracy (higher number means better) Attended events are processed better and lead to improved performance in behaviour. -where our attention is, what is better attended, receives better performance -see benefits in our behaviour Model tasks (of measuring attention in labs): -Like covert attention: eyes are fixed in the middle of the screen -These tasks are simple, easy to implement, don’t take much time, portable (can test different people, in scanners, etc) Cuing task (object/spacial properties) Michael Posner Visual search (the role of attention in search) RSVP - Rapid Stream Visual Presentation
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Cuing task (object/spatial properties) -people are told to look at one of two boxes -wait a period of time before presenting a cue (lower means better)
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This note was uploaded on 03/01/2012 for the course PSYC 213 taught by Professor Levitin during the Winter '08 term at McGill.

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Lecture 7 - Jan 27 - Last Week WebCT Questions: Visual...

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