Färg och ansiktsform hanteras separat i synbarken, men integreras stegvis med varandra

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Färg och ansiktsform hanteras i flera separata regioner i hjärnans synbark, visar experiment på makaker. Regionerna bildar som två parallella stråk, där flertalet färgregioner ligger invid en ansiktsform-region. Färg- och formaspekter av synintryck tycks alltså hanteras parallellt i flera separata steg, med informationsutbyte och hopkoppling mellan färg och form i flera av stegen. (Av Rosa Lafer-Sousa och Bevil Conway, 2013)

Titel: Parallel, multi-stage processing of colors, faces and shapes in macaque inferior temporal cortex

Författare: Lafer-Sousa, Rosa; Conway, Bevil R

Publikation: Nat Neurosci

Volym: 16

Nummer: 12

Sidor: 1870-1878

Publicerad: 2013

Sammandrag: Visual-object processing culminates in inferior temporal cortex (IT). To assess the organization of IT, we measured functional magnetic resonance imaging responses in alert monkeys to achromatic images (faces, fruit, bodies and places) and colored gratings. IT contained multiple color-biased regions, which were typically ventral to face patches and yoked to them, spaced regularly at four locations predicted by known anatomy. Color and face selectivity increased for more anterior regions, indicative of a broad hierarchical arrangement. Responses to non-face shapes were found across IT, but were stronger outside color-biased regions and face patches, consistent with multiple parallel streams. IT also contained multiple coarse eccentricity maps: face patches overlapped central representations, color-biased regions spanned mid-peripheral representations and place-biased regions overlapped peripheral representations. These results show that IT comprises parallel, multi-stage processing networks subject to one organizing principle.

Länk till original: http://dx.doi.org/10.1038/nn.3555

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