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• W2022941364 abstract "1. The dense system of horizontal connections that arise and course within the striate cortex are thought to inform single cells about stimuli arising in disparate points in visual space and to modulate responses evoked from within the receptive field. To learn whether or not the strength of the horizontal connections could vary over the long term, and if such changes could affect the integration of vertical, interlaminar inputs, we have recorded intracellularly from the superficial layers in slices of the adult cat's visual cortex. 2. The monosynaptic EPSP evoked by stimulating horizontal fibres showed long-term facilitation in twelve of the twenty cells that were conditioned by repetitively pairing synaptic responses with depolarizing pulses of current; the maximum increase observed was 200%. Strong inhibition present in the postsynaptic response usually indicated that facilitation would not occur. 3. In instances where horizontal input evoked both mono- and polysynaptic EPSPs, both early and late events showed facilitation, with the most dramatic enhancement contributed by the polysynaptic components. 4. For the twenty-eight cells whose responses to stimulation of interlaminar as well as horizontal pathways were assessed, all were found to receive non-overlapping inputs from each source. Conditioning produced long-term changes in the strength of the interlaminar inputs. 5. Changes in synaptic strength were usually confined to the conditioned pathway, though in four out of twenty-six times we observed heterosynaptic facilitation of polysynaptic EPSPs. 6. The conditioning protocol led to lasting depression rather than facilitation in three out of eleven instances; the reduction was only observed in the multisynaptic components. 7. We suggest that the synaptic changes observed here may be related to certain dynamic changes in receptive field properties that have been characterized in vivo." @default.
• W2022941364 created "2016-06-24" @default.
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• W2022941364 creator A5091847359 @default.
• W2022941364 date "1993-02-01" @default.
• W2022941364 modified "2023-09-26" @default.
• W2022941364 title "Long-term changes in synaptic strength along specific intrinsic pathways in the cat visual cortex." @default.
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• W2022941364 doi "https://doi.org/10.1113/jphysiol.1993.sp019512" @default.
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