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Lecture 11

PSYC 212 Lecture 11: Chapter 4 – lecture 11 & 12

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PSYC 212
Mathieu Roy

Chapter 4 – lecture 11 & 12  What and where pathways o Extrastriate cortex (v2, v3, etc.): region of cortex bordering the primary visual cortex and containing multiple areas involved in visual processing  Receptive fields larger, more complex from v1 to higher level areas o Where pathway: to parietal lobe for location of objects in space  Midget bipolar cells  p ganglion cells  parvocellular layers  P cells w/ small receptive field, high resolution o What pathway: to temporal lobe for object recognition  Diffuse bipolar cells  m ganglion cells  magnocellular layers  M cells w/ large receptive field, sensitive to movement o Lesion: region of damaged brain o Agnosia: failure to recognize objects but can see them  Apperceptive: normal vision, put together object, lesion close to v1, cannot copy  Associative: perceive the object but can’t identify, lesion farther from v1, can copy o Inferotemporal (IT) cortex: part of cerebral cortex in lower portion of temporal lobe, important in object recogniztion  Large repective field good at objects but not spots/lines  Population coding: stimulus identity encoded by spatio-temporal firing across multiple neurons o Homologous regions: brain regions that seem to have same function in dif species o Feed-forwards process: process that carries out a computation w/o need for feedback from later stage to earlier  Object recognition o Middle/midlevel vision: loosely defined stage of visual processing that comes after basic features have been extracted from the image (low-level/ early vision) and before object recognition and scene understanding (high-level vision) o Illusory contour: perceived even though nothing changes from one side of it to the other in an image o Structuralism: school of thought believing complex objects can be understood by analysis of components o Gestalt: school of thought stressing perceptual whole greater than apparent sum of parts o Gestalt grouping rules: describe which elements in an image will appear to group together  Good continuation lie on the same contour  Closure: a closed contour is preferred to an open contour  Occlusion: the perception that a form is occluding another form can be understood using the principles of good continuation and closure  Relatability: the degree to which two line segments appear to be part of he same contour o Flexible version of good continuation: the lines don’t need to perfectly align, but there has to be a parsimonious explanation  Nonaccidental feature: a feature of an object that is not dependent of the exact/accidental viewing position of the observer  Dynamic occlusion: The visible regions of the fire truck are discon
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