Perceiving And Recognizing Objects

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PSYC 4031
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SensationPerception Chapter 4Perceiving and Recognizing ObjectsA cell will respond to its preferred stimulus only if stimulus is presented in a very specific location relative to the point where the observer is fixating its gaze The extrastriate cortex is a set of visual areas so called because they lie just outside the primary visual cortex The visual system has many different problems to solve like the problem of face processing and it appears to have modules that are specialized for working on different problemsHow do we recognize objectsRetinal ganglion cells and LGNSpotsPrimary visual cortexBarsHow do spots and bars get turned into objects and surfacesClearly our brains are doing something pretty sophisticated beyond V1 From the extrastriate regions of the occipital lobe of the brain visual information moves out along two main pathways One pathway heads up into the parietal lobe Visual areas in the pathway are important relating to the location of objects in space and the actions required to interact with them moving the hands eyes This pathway is known as the where pathway It plays an important role in the deployment of attention The other pathway heads down into the temporal lobe and is known as the what pathway The pathway appears to be the locus for the explicit acts of object recognitionWhat and Where 2 streams for processing visual informationDorsal Parietal LobeWhere processingMagno movement layers of the LGN VentralTemporalWhat processingParvo color texture Layers of the LGN Early evidence for a relationship between the temporal lobe and object recognition came from studies in which large sections of the temporal lobe were destroyed lesioned in monkeys When this happened the monkeys behaved as though they could see but didnt know what they were seeing Inferotemporal IT cortex part of the cerebral cortex in the lower portion of the temporal lobe important in object recognition Were discovered to have receptive fields that could spread over half or more of the monkeys field of viewMaintain connections with parts of the brain involved in memory formationo Part of the what pathwayReceptive field properties of IT neuronsVery largesome cover half the visual fieldDont respond well to spots or linesDo respond well to stimuli such as hands faces or objects
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