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Lecture 15

PSYC340 Lecture 15: Quiroga Reading

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University of Delaware
Medina Jared

Madison Newman PSYC 340080 41117 Quiroga et. al. 2005: Invariant visual representation by single neurons in the human brain Medial temporal lobe (MTL)fires selectively to images of faces, animals, objects, scenes Neurons that selectively fired depending on photos or images the participant was viewing o People, places, structures o Singleunit recordingshowed significant activity depending on the image the participant was viewing, i.e. a photo of Jennifer Aniston o Particular neuron responses for specific images o Singleunit neuron that responds to Sydney Opera may also respond t the presentation of the letter string Sydney Opera o Relative number of responses to pictures of a specific individual, object, animal, or landmark building o Objectspecific neuronsmay be at the core of how we make memories Visual information that triggers facts about the visual being viewed Neurons change firing properties to encode new memories Banich and Compton: Chapter 7: Object Recognition Ventral System deficitsWHAT recognition in vision Ventral visualprocessing streamconsists of areas of the occipital, occipitotemporal, and temporal regions that are devoted to processing visual stimuli Receptive field of a cellis the area of visual space to which the cell is sensitive Figureground separationcolor aids in object recognition because it allows us to separate an object from its background Visual agnosiainability to recognize objects in the visual modality that cannot be explained by other causes, such as an inability to do basic visual processing, memory, or language Modality specificdeficit only is in one of the senses (vision) Apperceptive agnosiadifficulty in forming a percept (mental impression of something perceived by the senses) Associative agnosiabasic visual information can be integrated to form a meaningful perceptual whole, yet that particular perceptual whole cannot be linked to store knowledge Prosopagnosiainability to recognize or differentiate among faces Developmental (congenital) prosopagnosiaindividuals who are born to be faceblind without any brain damage
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