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Related Concept Videos

Visual Agnosia01:12

Visual Agnosia

Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round end"...

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Extended visual simultaneity thresholds in patients with schizophrenia.

Anne Giersch1, Laurence Lalanne, Caroline Corves

  • 1INSERM U666, Centre Hospitalier Régional de Strasbourg, Pôle de Psychiatrie, BP 406, 67091 Strasbourg Cedex, France. giersch@alsace.u-strasbg.fr

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Summary

Schizophrenia patients struggle to perceive when events happen simultaneously, requiring longer delays to detect asynchronous stimuli. This study highlights impairments in temporal perception and event-structure coding in schizophrenia.

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Area of Science:

  • Cognitive Neuroscience
  • Psychiatry

Background:

  • Clinical observations suggest temporal phenomenology disturbances in schizophrenia.
  • These may stem from impaired dynamic cognitive functions like language and motor planning.

Purpose of the Study:

  • To experimentally investigate subjective evaluation of temporal structure in schizophrenia.
  • To assess simultaneity judgments and the impact of subthreshold priming on temporal perception.

Main Methods:

  • Utilized a visual simultaneity judgment task with a subthreshold priming procedure.
  • Included 19 schizophrenia outpatients and matched controls, adapting primes to subject responses to detect bias effects.

Main Results:

  • Schizophrenia patients required significantly longer delays to perceive asynchronous stimuli.
  • Patients judged stimuli as synchronous even with delays exceeding 100 milliseconds.
  • Subthreshold synchrony effects were preserved, arguing against response bias.

Conclusions:

  • Subjective evaluation of simultaneity/asynchrony is impaired in schizophrenia.
  • This impairment contributes to altered event-structure coding and time phenomenology.
  • The study presents a novel method for assessing temporal disturbances in schizophrenia.