Topic 3.3 Outline PSY 402.docx - 1 of 7 Name Kaylin Tokuda...

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1 of 7 Name: Kaylin Tokuda Class: Psy-402 Date: Feb 9 Topic 3.3 Cognitive Object Recognition 1) Object recognition (pattern recognition) a) Identification of an arrangement of complex sensory stimuli and perception of the object as separate from its background b) Recognition i) The comparison of info received from sensory receptors to stimuli that had been previously stored in memory ii) this analysis is bottom up due to the fact its begins with the stimuli in the environment 2) Visual system a) The Observed stimulus is divided into two types i) DISTAL: (1) the actual object that is “out there” in the environment ii) Proximal: (1) The representation of the stimulus that is registered by the sensory receptors b) A visual proximal stimulus is registered by the collection of rods and cones on the retina of the eye c) The distal and proximal stimulus are not identical d) The brain must work on recognizing the stimulus based on incomplete and imperfect information e) Object recognition tends to depend primarily on shape rather than texture or color i) This may be why cartoons are still very recognizable in spite of their distortions of both color and texture f) Sensory memory i) A large capacity storage system that records information from each of the senses with reasonable accuracy
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2 of 7 g) Iconic memory (visual memory) i) Preserves an image of a visual stimulus for a brief period after the image has disappeared h) Visual information only takes 50-80 milliseconds to move from the retina to the visual cortex i) After reaching the visual cortex, information is sent to other parts of the brain for further analysis i) Usually the parietal and temporal cortices j) Day to day people often perceive images differently than they actually are k) People tend to “fill in the blanks” when faced with incomplete or unsensible infromation i) While this strategy is efficient it is also often prone to error l) People usually cannot tell the difference between what they literally see and what they perceive 3) Theories of Object Recognition a) Template theory of object recognition i) Early theory that suggested the visual memory contains a series of templates that visual sensations are compared to ii) The template theory was found to have significant limitations due to the variability of stimulus
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