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Titolo:
Multistable phenomena: Changing views in perception
Autore:
Leopold, DA; Logothetis, NK;
Indirizzi:
Max Planck Inst Biol Cybernet, D-72076 Tubingen, Germany Max Planck Inst Biol Cybernet Tubingen Germany D-72076 Tubingen, Germany
Titolo Testata:
TRENDS IN COGNITIVE SCIENCES
fascicolo: 7, volume: 3, anno: 1999,
pagine: 254 - 264
SICI:
1364-6613(199907)3:7<254:MPCVIP>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
BINOCULAR RIVALRY ALTERNATIONS; HUMAN EXTRASTRIATE CORTEX; PRIMARY VISUAL-CORTEX; EYE-MOVEMENTS; AMBIGUOUS FIGURES; RECOGNITION CONTRIBUTIONS; STOCHASTIC PROPERTIES; OBJECT RECOGNITION; NEURAL ACTIVITY; ATTENTION;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Social & Behavioral Sciences
Life Sciences
Citazioni:
112
Recensione:
Indirizzi per estratti:
Indirizzo: Leopold, DA Max Planck Inst Biol Cybernet, Spemannstr 38, D-72076 Tubingen, Germany Max Planck Inst Biol Cybernet Spemannstr 38 Tubingen Germany D-72076
Citazione:
D.A. Leopold e N.K. Logothetis, "Multistable phenomena: Changing views in perception", TRENDS C SC, 3(7), 1999, pp. 254-264

Abstract

Traditional explanations of multistable visual phenomena (e.g. ambiguous figures, perceptual rivalry) suggest that the basis for spontaneous reversals in perception lies in antagonistic connectivity within the visual system. In this review, we suggest an alternative, albeit speculative. explanationfor visual multistability - that spontaneous alternations reflect responses to active, programmed events initiated by brain areas that integrate sensory and non-sensory information to coordinate a diversity of behaviors. Much evidence suggests that perceptual reversals are themselves more closely related to the expression of a behavior than to passive sensory responses: (1) they are initiated spontaneously, often voluntarily, and are influenced by subjective variables such as attention and mood; (2) the alternation process is greatly facilitated with practice and compromised by lesions in non-visual cortical areas; (3) the alternation process has temporal dynamics similar to those of spontaneously initiated behaviors; (4) functional imaging reveals that brain areas associated with a variety of cognitive behaviorsare specifically activated when vision becomes unstable. In this scheme, reorganizations of activity throughout the visual cortex, concurrent with perceptual reversals, are initiated by higher, largely non-sensory brain centers. Such direct intervention In the processing of the sensory input by brain structures associated with planning and motor programming might serve animportant role in perceptual organization, particularly in aspects relatedto selective attention.

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Documento generato il 20/01/20 alle ore 04:49:22