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
Volumen: 15
Ausgabe: 18
Startseite: 2761
Seitenende: 2764
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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