Lecture 5 - Lecture 5 Vision Hearing Smell Taste Cutaneous...

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Lecture 5 Vision Hearing Smell Taste Cutaneous senses Retina is the extension of the brain; rods and cones are specialized neurons The Feature-Detector Approach Brain analyzes complex visual stimuli by breaking them into components We have feature detectors (neurons- most in occipital lobe) Specialized neurons- respond to simple features such as angles, lines, edges, or boundaries Hubel & Wiesel’s experiments The inserted electrodes into neurons of the visual cortex in monkeys and cats and recorded activity of those cells, as the animals looked at what was presented on the screen The identified cells that fired only in the presence of vertical bars of light and others that only fired for horizontal bars Also, found cells that responded to movement in particular directions Feature detectors are just a first step in a series of complex processes that create perception Visual Illusions Simple visual illusions such as the old/young woman illusion suggest that we actively impose meaning/structure on images that we see.
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