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PSYA01 Ch 6

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Steve Joordens

Ch 6 PerceptionPerception an automatic unconscious process by which we recognize whats represented by the info provided by our sense organsHubel Wiesel conducted experiments of visual analysisdisd that the geography of the visual field is retained in the primary visual cortexThe primary visual cortex contains modules a block of cortical tissue containing neurons that receives info f the same group of receptor cellsNeurons within each module analyzes various characteristics of their own receptive field that portion of the visual field in which the presentation of visual stimuli will produce an alteration in the firing rate of a particular neuron Ie Some neurons detect the lines clr other circuits detect the width of the lines The visual association cortex is responsible for the perception of objectsthe totality of the visual scene through the combination of individuals modules f both eyes Visual perception by the brain is performed as a hierarchy of information Neurons analyze particular aspects of visual infosend the results to other neurons for further analysis of more complex features until the process leads to the perception of the scenethe objects in it The higher levels of perceptual process interact w memories familiar objects are recognized whereas new ones are learnt Primary visual cortex visual association cortex ventraldorsal streamVentral stream the flow of info f the primary visual cortex to the visual association area in the lower temporal lobe used to the form the perception of an objects shape clrorientation the what systemPerception of formVisual agnosia the inability of a person who is not blind to recognize the identity of an object visually caused by damage to the visual association cortex Prosopagnosia a symptom of visual agnosia characterized by difficulty in the recognition of ppls faces caused by damage to the visual association cortex Fusiform face area FFA a region of the ventral stream of the visual system that contains facerecognizing circuits the failure of recognition is not confined to facesExtrastriate body area EBA a region of the occipital cortex next to the primary visual cortex that responds to forms resembling the human body Parahippocampal place area PPA a region of the ventral stream below the hippocampus that is activated by visual scenesbckgrds beaches markets deserts Perception of clrCerebral achromatopsia the inability to distinguish among diff hues caused by damage to the visual association cortex Patients vision resembles a blackwhite film Dorsal stream the flow of info f the primary visual cortex to the visual association area in the parietal lobe used to form the perception of an objects location in 3D space the where system Perception of Spatial LocationIt helps locate objectsdirects movements toward them Ie being able to adjust the distance btw the thumbforefinger to the size of a block in order to pick it upPerception of movement
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