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6 Cards in this Set
- Front
- Back
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in the news
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APOE “apolipoprotein E”
E4 version of APOE gene increases individuals risk for developing late-onset Alzheimer’s disease (50%) of cases P’s (ages 37-80)all carried APOE gene but in one group, p’s also had at least one parent with Alzheimers’s or dementia Subjects performed worse in memory tests compared to middle-age people who had the same gene but did not have a parent diagnosed with Alzheimer’s Difference in memory was equivalent to approximately 15 years of extra brain aging 55-70 year Use it or lose it hypothesize: have to keep mind moving |
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Receptive field
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” The portion of the visual field in which the presentation of visual stimuli will produce an alteration in the firing rate of a particular neuron
What the cell “sees |
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Receptive field of a ganglion cell
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The region in the retina where light influences the response of that ganglion cell
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Each receptive field is arranged into:
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central disk, the “center“
concentric ring, the "surround“ Each region responding oppositely to light |
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Why center-surround receptive field organization?
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Allows ganglion cells to transmit information not merely about whether photoreceptor cells are exposed to light, but also about the differences in firing rates of cells in the center and surround of the receptive field
This allows them to transmit information about contrast Chair colors, light and dark contours |
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Both stimulated
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weak response
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