psych120a week2 lecture1.doc - Hierarchical organization of...

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Hierarchical organization of visual perception Visual input Low level vision = oriented bars/edges, motion, texture, depth High level vision = object/face/scene/word recognition o Is the face young or old, do I know the person? o Once features are recognized then they are integrated to process the words with semantics of processing what the word means then understand Knowledge Human visual system Does not get sent directly Has a relay station in thalamus at LGN before going to visual cortex/occipital lobe From front of eye to back of brain Single-unit recording (usually in animal studies) Measure activity of a single neuron with electrode probe Map out the cell’s receptive field Lots of action potentials when neuron is seeing the stimulus You can figure out what area of space that neuron is sensitive to o Move the stimulus around and see where the neuron is firing rapidly o Mapping out the receptive field Right visual field, left visual field Map out the entire field that the neuron is sensitive to If the stimulus is in the center of the receptive field, then the neuron will fire rapidly If the stimulus is outside of the receptive field than it will fire less o Inhibited when the stimulus is slightly outside the visual field o We know this because it fires more when there is no stimulus than when the
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  • Spring '07
  • Harley
  • LGN,  Knowledge

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