Multistable Perception: When Bottom-Up and Top-Down Coincide

Autor/inn/en	Kornmeier, Jurgen; Hein, Christine Maira; Bach, Michael
Titel	Multistable Perception: When Bottom-Up and Top-Down Coincide
Quelle	In: Brain and Cognition, 69 (2009) 1, S.138-147 (10 Seiten) PDF als Volltext Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	0278-2626
DOI	10.1016/j.bandc.2008.06.005
Schlagwörter	Stimuli; Observation; Visual Perception; Cognitive Processes + Suchen Sie Ihr Suchwort? Anreizsystem; Beobachtung; Visuelle Wahrnehmung; Cognitive process; Kognitiver Prozess
Abstract	During prolonged observation of an ambiguous figure sudden perceptual reversals occur, while the stimulus itself stays unchanged. There is a vivid debate about whether bottom-up or top-down mechanisms underlie this phenomenon. In the present study, we investigated the interrelation of two experimental factors: volitional control and discontinuous stimulus presentation. Both factors strongly modulate the rate of perceptual reversals and each is attributed either as top-down or bottom-up. We found that participants can apply specific strategies to volitionally increase and/or decrease the stability duration of each of the possible percepts according to the experimental instructions. When attempts of volitional control are combined with discontinuous stimulus presentation the effects are fully additive. Our results indicate that perceptual reversals can originate from different neural mechanisms on different time scales. (Contains 5 tables and 5 figures.) (As Provided).
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Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2017/4/10