2-1-S_P-Vision3 - Sensation & Perception: Vision III...

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1 Sensation & Perception: Vision III Vision III Color Vision (cont.) • Receptive Fields • Gestalt Psychology & Perceptual Grouping • Context, Experience, &Top- Down Processing • Depth Perception Color Blindness • Color blindness occurs when individuals lack a particular pigment in the S-, M-, or L-cones Deuteranopia , or red-green color blindness, is the most common form of color blindness Normal Deuteranope
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2 Ishihara Test for Color Blindness Ishihara Test for Color Blindness Synesthesia Synesthesia is a neurological condition in which there is a mixing of the senses • The most common forms of synesthesia involve the mixing of color with other visual perceptions 1 2 3 4 5 6 7 8 9 0 Color-digit synesthesia Color-letter synesthesia
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3 Synesthesia Normal Perception Perception of a color-digit synesthete Vision III • Color Vision (cont.) Receptive Fields • Gestalt Psychology & Perceptual Grouping • Context, Experience, &Top- Down Processing • Depth Perception Receptive Fields • Neurons all along the visual pathways have receptive fields • A receptive field is a region of visual space to which a neuron selectively responds no stimulus stimulus in receptive field stimulus not in receptive field
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4 Orientation Selective Cells • In primary visual cortex (V1), receptive field properties start to show more complex characteristics such as orientation selectivity b stimulation of their receptive field only increases activity if the stimulus is of a particular orientation A cell selective for 45 degrees Orientation Selective Cells • Orientation selective cells are often referred to as being feature detectors • That is, they detect simple features of stimuli • Simple features may be combined to form more complex objects • cells further up the visual pathway also show selectivity for more complex patterns such as faces Receptive Field Sizes
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2-1-S_P-Vision3 - Sensation & Perception: Vision III...

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