Population coding of orientation in the visual cortex of alert cats - an information theoretic analysis
Autor(en): | Kayser, C Konig, P |
Stichwörter: | area 21a; CORTICAL-NEURONS; firing rate; information; Neurosciences; Neurosciences & Neurology; population coding; redundancy; synergy | Erscheinungsdatum: | 2004 | Herausgeber: | LIPPINCOTT WILLIAMS & WILKINS | Journal: | NEUROREPORT | Volumen: | 15 | Ausgabe: | 18 | Startseite: | 2761 | Seitenende: | 2764 | Zusammenfassung: | We studied the encoding of stimulus orientation in the visual cortex of alert animals using information theory methods. Based on a labeled-line code, the encoding of orientation was mostly synergistic and only few pairs coded redundant. The synergy contributed about 20% of the information and was strongest for sites with distinct tuning curves. A recently proposed decomposition of synergy revealed that redundancy introduced by common tuning preferences is more than just compensated by noise correlations which mostly contributed synergistically. Based on a pooled response code, the contribution of noise correlations diminished resulting in a severe information loss. Thus, to operate economically, cortical neurons should either employ a labeled-line code or, if using pooled responses, be highly selective in choosing afferents. |
ISSN: | 09594965 |
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