Integration of local inputs in visual cortex

In mammalian visual cortex, local connections are ubiquitous. extensively linking adjacent neurons of all types. In this study. optical maps of intrinsic signals and responses from single neurons were obtained from the same region of cat visual cortex while the effectiveness of the local cortical circuitry was altered by focally disinhibiting neurons within a column of known orientation preference. Maps of intrinsic signals indicated that local connections provide strong and functional subthreshold inputs to neighboring columns of other orientation preferences, altering the observed orientation preference to that of the disinhibited column. However, measuring the suprathreshold response using single-cell recordings revealed only mild changes of preferred orientation over the affected region. Because strongly tuned subthreshold inputs from cortex only marginally affect the tuning of a cortical cell's output, it is concluded that local cortical inputs are integrated weakly compared to geniculate inputs. Such circuitry potentially allows for the normalization of responses across a wide range of input activity through local averaging.
Publisher
OXFORD UNIV PRESS INC
Issue Date
1997-12
Language
ENG
Keywords

CELL ORIENTATION SELECTIVITY; SPINY STELLATE NEURONS; INHIBITORY MECHANISMS; STRIATE CORTEX; CAT; CONNECTIONS; SPECIFICITY; COMPLEX; PATTERNS; MODEL

Citation

CEREBRAL CORTEX, v.7, no.8, pp.703 - 710

ISSN
1047-3211
DOI
10.1093/cercor/7.8.703
URI
http://hdl.handle.net/10203/73728
Appears in Collection
EE-Journal Papers(저널논문)
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