Wilke, Melanie

[["dc.bibliographiccitation.firstpage","1076"],["dc.bibliographiccitation.issue","13"],["dc.bibliographiccitation.journal","Current Biology"],["dc.bibliographiccitation.lastpage","1085"],["dc.bibliographiccitation.volume","13"],["dc.contributor.author","Maier, Alexander"],["dc.contributor.author","Wilke, Melanie"],["dc.contributor.author","Logothetis, Nikos K."],["dc.contributor.author","Leopold, David A."],["dc.date.accessioned","2017-09-07T11:43:43Z"],["dc.date.available","2017-09-07T11:43:43Z"],["dc.date.issued","2003"],["dc.description.abstract","Continuous viewing of ambiguous patterns is characterized by wavering perception that alternates between two or more equally valid visual solutions. However, when such patterns are viewed intermittently, either by repetitive presentation or by periodic closing of the eyes, perception can become locked or “frozen” in one configuration for several minutes at a time. One aspect of this stabilization is the possible existence of a perceptual memory that persists during periods in which the ambiguous stimulus is absent. Here, we use a novel paradigm of temporally interleaved ambiguous stimuli to explore the nature of this memory, with particular regard to its potential impact on perceptual organization.Results: We found that the persistence of a perceptual configuration was robust to interposed visual patterns, and, further, that at least three ambiguous patterns, when interleaved in time, could undergo parallel, stable time courses. Then, using an interleaved presentation paradigm, we established that the occasional reversal in one pattern could be coupled with that of its interleaved counterpart, and that this coupling was a function of the structural similarity between the patterns.Conclusions: We postulate that the stabilization observed with repetitive presentation of ambiguous patterns can be at least partially accounted for by processes that retain a recent perceptual interpretation, and we speculate that such memory may be important in natural vision. We further propose that the interleaved paradigm introduced here may be of great value to gauge aspects of stimulus similarity that appeal to particular mechanisms of perceptual organization."],["dc.identifier.doi","10.1016/s0960-9822(03)00414-7"],["dc.identifier.gro","3151622"],["dc.identifier.pmid","12842006"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/8435"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.notes.submitter","chake"],["dc.relation.issn","0960-9822"],["dc.title","Perception of Temporally Interleaved Ambiguous Patterns"],["dc.type","journal_article"],["dc.type.internalPublication","no"],["dc.type.peerReviewed","no"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1193"],["dc.bibliographiccitation.issue","10"],["dc.bibliographiccitation.journal","Nature Neuroscience"],["dc.bibliographiccitation.lastpage","1200"],["dc.bibliographiccitation.volume","11"],["dc.contributor.author","Maier, Alexander"],["dc.contributor.author","Wilke, Melanie"],["dc.contributor.author","Aura, Christopher"],["dc.contributor.author","Zhu, Charles"],["dc.contributor.author","Ye, Frank Q."],["dc.contributor.author","Leopold, David A."],["dc.date.accessioned","2017-09-07T11:43:43Z"],["dc.date.available","2017-09-07T11:43:43Z"],["dc.date.issued","2008"],["dc.description.abstract","The role of primary visual cortex (V1) in determining the contents of perception is controversial. Human functional magnetic resonance imaging (fMRI) studies of perceptual suppression have revealed a robust drop in V1 activity when a stimulus is subjectively invisible. In contrast, monkey single-unit recordings have failed to demonstrate such perception-locked changes in V1. To investigate the basis of this discrepancy, we measured both the blood oxygen level–dependent (BOLD) response and several electrophysiological signals in two behaving monkeys. We found that all signals were in good agreement during conventional stimulus presentation, showing strong visual modulation to presentation and removal of a stimulus. During perceptual suppression, however, only the BOLD response and the low-frequency local field potential (LFP) power showed decreases, whereas the spiking and high-frequency LFP power were unaffected. These results demonstrate that the coupling between the BOLD and electrophysiological signals in V1 is context dependent, with a marked dissociation occurring during perceptual suppression."],["dc.identifier.doi","10.1038/nn.2173"],["dc.identifier.gro","3151626"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/8439"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.notes.submitter","chake"],["dc.relation.issn","1097-6256"],["dc.title","Divergence of fMRI and neural signals in V1 during perceptual suppression in the awake monkey"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","no"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","231"],["dc.bibliographiccitation.lastpage","258"],["dc.contributor.author","Leopold, David A."],["dc.contributor.author","Maier, Alexander"],["dc.contributor.author","Wilke, M."],["dc.contributor.author","Logothetis, Nikos K."],["dc.contributor.editor","Alais, David"],["dc.contributor.editor","Blake, Randolph"],["dc.date.accessioned","2017-11-15T09:12:00Z"],["dc.date.available","2017-11-15T09:12:00Z"],["dc.date.issued","2005"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/9994"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.publisher","MIT Press"],["dc.publisher.place","Cambridge, MA."],["dc.relation.isbn","0-262-01212-X"],["dc.relation.ispartof","Binocular Rivalry"],["dc.title","Binocular rivalry and the illusion of monocular vision"],["dc.type","book_chapter"],["dc.type.internalPublication","unknown"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","605"],["dc.bibliographiccitation.issue","6"],["dc.bibliographiccitation.journal","Nature Neuroscience"],["dc.bibliographiccitation.lastpage","609"],["dc.bibliographiccitation.volume","5"],["dc.contributor.author","Leopold, David A."],["dc.contributor.author","Wilke, Melanie"],["dc.contributor.author","Maier, Alexander"],["dc.contributor.author","Logothetis, Nikos K."],["dc.date.accessioned","2017-09-07T11:43:43Z"],["dc.date.available","2017-09-07T11:43:43Z"],["dc.date.issued","2002"],["dc.description.abstract","During the viewing of certain patterns, widely known as ambiguous or puzzle figures, perception lapses into a sequence of spontaneous alternations, switching every few seconds between two or more visual interpretations of the stimulus. Although their nature and origin remain topics of debate, these stochastic switches are generally thought to be the automatic and inevitable consequence of viewing a pattern without a unique solution. We report here that in humans such perceptual alternations can be slowed, and even brought to a standstill, if the visual stimulus is periodically removed from view. We also show, with a visual illusion, that this stabilizing effect hinges on perceptual disappearance rather than on actual removal of the stimulus. These findings indicate that uninterrupted subjective perception of an ambiguous pattern is required for the initiation of the brain-state changes underlying multistable vision."],["dc.identifier.doi","10.1038/nn851"],["dc.identifier.gro","3151623"],["dc.identifier.pmid","11992115"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/8436"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.notes.submitter","chake"],["dc.relation.issn","1097-6256"],["dc.title","Stable perception of visually ambiguous patterns"],["dc.type","journal_article"],["dc.type.internalPublication","no"],["dc.type.peerReviewed","no"],["dspace.entity.type","Publication"]]