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Lecture 29,30 March 26 and 28.docx

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Western University
Kinesiology 1080A/B
Matthew Heath

thWednesday March 26 2014Going to give us an article five questions about this article on this exam general questions about the article whether you readunderstood the article not the number of participants read article and understand it Read it four times to get a really good sense of itGeniculostriate pathway going from the lateral geniculate nucleus to the primary visual cortex Once the info gets to V1 where that info goes depends on what its going to be used forAnything that involves us interacting with the environment actions such as jumping reaching etc goes from V1 to the posterior parietal cortex the entire green box in the schematicV1PPC is the visual pathway that supports actionsdorsal visual pathwayIf we are going to use vision to make an explicit perceptual identification judgment eg looking at triangle or square or cup or hatinfo goes from V1 to the inferior temporal cortex V1 ITCis the pathway that supports our perceptionsventral visual pathway This is a very simplified approach associated with these two pathwaysThis is aDUPLEX MODEL OF VISUAL PROCESSING or TWOSTREAM MODEL of visual processingThis model was developed by some dude and David MilnerWe will be talking about the underlying framework of this modelTwo distinct cortical pathways that support visions for actions and visions for perceptionsThere is a third important visual pathway the EXTRAGENICULATE PATHWAYExtrageniculate PathwayWe have visual stimulus at top right hand corner that passes to the retina from there to the superior colliculus SC brain stem structurefrom the SC it projects to a seeing part of the thalamus known as the pulvinar then from the pulvinar the info is projected directly to the posterior parietal cortex Retinasuperior colliculuspulvinar posterior parietal cortexExtrageniculate pathway is also important to support actions in particular stimulus driven actionsThis pathway is engaged by unexpected and dynamic visual information Eg how did you get laundry as it was about to fall out not conscious of this action Performing actions you were unaware of is by this stimulus driven extrageniculate pathwayoIt does not have any high level cognitive control before getting to the posterior cortexoBecause of that it can operate at this unconscious levelcan execute an action without being aware of that action being planned
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