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Extended visual simultaneity thresholds in patients with schizophrenia

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dc.contributor.author Elliott, Mark en
dc.date.accessioned 2011-01-11T15:31:09Z en
dc.date.available 2011-01-11T15:31:09Z en
dc.date.issued 2009-07 en
dc.identifier.citation Giersch, A., Lalanne, L., Corves, C., Seubert, J., Shi, Z., Foucher, J., et al. (2009). Extended visual simultaneity thresholds in patients with schizophrenia. Schizophrenia Bulletin, 35(4), 816-825. en
dc.identifier.issn 0586-7614 en
dc.identifier.uri http://hdl.handle.net/10379/1522 en
dc.description.abstract Clinical observations suggest that the experience of time phenomenology is disturbed in schizophrenia, possibly originating disorders in dynamic cognitive functions such as language or motor planning. We examined the subjective evaluation of temporal structure using an experimental approach involving judgments of simultaneity of simple, visually presented stimuli. We included a priming procedure, ie, a subthreshold presentation of simultaneous or asynchronous stimuli. This allowed us to evaluate the effects of subthreshold synchrony and to check for bias effects, ie, changes in the criteria used by the subjects to rate the stimuli. Primes were adapted to the responses of the subjects. Bias effects were thus expected to yield a change in the efficiency of the prime and to induce a change in the amplitude of the priming effect. Nineteen outpatients with schizophrenia and their individually matched controls participated in the study. In all tests, patients required longer delays between stimuli to detect that they were asynchronous. In other words, they judged stimuli to be synchronous even when their onset was separated by delays of 100 milliseconds and even more in some cases. These results contrasted with preserved effects of subthreshold synchrony. Our findings argue against the hypothesis that the patients' responses were influenced by biases. We conclude that the subjective evaluation of simultaneity/asynchrony is impaired in schizophrenia, thus leading to impairment in the phenomenology of event-structure coding. The method used in the present study provides a novel approach to the assessment of those disturbances related to time in patients with schizophrenia. en
dc.format application/pdf en
dc.language.iso en en
dc.publisher Oxford University Press en
dc.subject Psychology en
dc.subject Psychophysics en
dc.subject Time phenomenology en
dc.subject Schizophrenia en
dc.title Extended visual simultaneity thresholds in patients with schizophrenia en
dc.type Article en
dc.local.publishedsource http://dx.doi.org/10.1093/schbul/sbn016 en
dc.description.peer-reviewed peer-reviewed en
dc.contributor.funder Centre Hospitalier Regional Universitaire de Strasbourg en
dc.contributor.funder Centre de Cooperation Universitaire Franco-Bavarois, Munich en

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