ANTICIPATION MECHANISMS IN TEMPORAL EVENT-CODING?

  • Anne Giersch
  • Mitsouko van Assche
  • Weixin Wang
  • Laurence Lalanne

Abstract

Results in patients with schizophrenia question the mechanisms underlying temporal event- coding. These patients are impaired at reporting an asynchrony between stimuli, but the results suggest excessive fragmentation rather than fusion of events in time. We used a simultaneity/asynchrony discrimination task and explored the impact of attention and spatial grouping by contrasting divided vs focused attention, and connected vs unconnected stimuli (squares). We replicated previous results, showing that the responses of patients and controls were biased in opposite ways on the side of the first or second square. Patients appear to be impaired at perceiving a succession between asynchronous squares, with a bias on the side of the second square decreasing instead of increasing in focused attention, when the location of squares is predictable. We will discuss the possibility of an anticipation impairment in patients, which by contrast may reveal the role of such anticipation in temporal event-coding in ‘healthy’ participants.

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