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Titolo:
Hierarchical processing of horizontal disparity information in the visual forebrain of behaving owls
Autore:
Nieder, A; Wagner, H;
Indirizzi:
Rhein Westfal TH Aachen, Inst Biol 2, Lehrstuhl Zool Tierphysiol, D-52074 Aachen, Germany Rhein Westfal TH Aachen Aachen Germany D-52074 , D-52074 Aachen, Germany
Titolo Testata:
JOURNAL OF NEUROSCIENCE
fascicolo: 12, volume: 21, anno: 2001,
pagine: 4514 - 4522
SICI:
0270-6474(20010615)21:12<4514:HPOHDI>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
FRONTAL EYE FIELD; BINOCULAR DISPARITY; STRIATE CORTEX; ORIENTATION SELECTIVITY; DEPTH-PERCEPTION; RECEPTIVE-FIELDS; BARN OWL; NEURONS; MACAQUE; RESPONSES;
Keywords:
binocular disparity; stereovision; coding ambiguity; hierarchical processing; visual forebrain; radiotelemetry; owl;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
42
Recensione:
Indirizzi per estratti:
Indirizzo: Nieder, A MIT, Dept Brain & Cognit Sci, Ctr Learning & Memory, E25-236,77 Massachusetts Ave, Cambridge, MA 02139 USA MIT E25-236,77 Massachusetts AveCambridge MA USA 02139 2139 USA
Citazione:
A. Nieder e H. Wagner, "Hierarchical processing of horizontal disparity information in the visual forebrain of behaving owls", J NEUROSC, 21(12), 2001, pp. 4514-4522

Abstract

According to their restricted receptive fields and input-filter characteristics, disparity-sensitive neurons at early processing levels of the visualsystem perform rather ambiguous computations; they respond vigorously to disparity in false-matched images and show multiple response peaks in their disparity-tuning profiles. On the other hand, the perception of depth from binocular disparity is reliable, thus raising the question as to where and how in the brain additional processing is accomplished leading toward behaviorally relevant disparity detection. To address this issue, tuning data during stimulation with correlated and anticorrelated random-dot stereograms (a-RDS) were obtained from 52 disparity-sensitive visual Wulst neurons in three behaving owls. From the disparity-tuning curves, several quantitative measures were derived that allowed to determine the response ambiguity of acell. A systematic decline of response ambiguities with increasing response latencies was observed. An increase in response latencies of neurons was correlated with a decrease of the strength of responses to a-RDS. Decliningresponses to a-RDS are expected for global detectors, because an owl was not able to discriminate depth in psychophysical tests with a-RDS. In addition, suppression of response side peaks was increased and disparity tuning was enhanced with growing response latencies. These results suggest a functional hierarchy of disparity processing in the owl's forebrain, leading fromspatial filters to more global disparity detectors that may be able to solve the correspondence problem. Nonlinear threshold operations and inhibition are proposed as candidate mechanisms to resolve coding ambiguities.

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Documento generato il 04/12/20 alle ore 09:00:48