Visual Cortex: Suppression by Depression?
نویسندگان
چکیده
منابع مشابه
Visual Cortex: Suppression by Depression?
The response of a neuron in the visual cortex to an oriented light bar is strongly reduced by concurrent presentation of a stimulus with a different orientation. New data suggest this 'cross-orientation suppression' is caused, not by intracortical inhibition, but by rapid depression of thalamocortical synapses.
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The images of the world are decomposed by our retinae and transmitted to the brain as neuronal spike trains. At each successive stage in the visual pathway, neurons display progressively more complex response properties and interactions, ultimately leading to the reconstruction of elaborate visual features in higher areas of the visual cortex. One such response property, which already emerges i...
متن کاملCross-orientation suppression in human visual cortex.
Cross-orientation suppression was measured in human primary visual cortex (V1) to test the normalization model. Subjects viewed vertical target gratings (of varying contrasts) with or without a superimposed horizontal mask grating (fixed contrast). We used functional magnetic resonance imaging (fMRI) to measure the activity in each of several hypothetical channels (corresponding to subpopulatio...
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Neurons in primary visual cortex (V1) are thought to receive inhibition from other V1 neurons selective for a variety of orientations. Evidence for this inhibition is commonly found in cross-orientation suppression: responses of a V1 neuron to optimally oriented bars are suppressed by superimposed mask bars of different orientation. We show, however, that suppression is unlikely to result from ...
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TBS (Theta Burst Stimulation) and PBs (Primed Bursts) are among effective tetanic stimulations for induction of LTP in hippocampus. Recent studies have indicated that TBS is effective in LTP induction in layer III synapses of neocortex, only if applied to layer IV. However, the possibility of neocortical LTP induction using PBs, has not yet been investigated. Sensory deprivation greatly influ...
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ژورنال
عنوان ژورنال: Current Biology
سال: 2002
ISSN: 0960-9822
DOI: 10.1016/s0960-9822(02)01049-7