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The novelty effect in recovered hemineglect

P Bartolomeo1

  • 1INSERM Unité 324, Centre Paul Broca, Paris, France. paolo@broca.inserm.fr

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|June 1, 1997
PubMed
Summary

Patients with left neglect show slower reaction times to left-sided stimuli. Recovered patients exhibit a novelty effect, improving over time, suggesting attention reorientation mechanisms possibly mediated by the prefrontal cortex.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology

Background:

  • Left neglect is a neurological condition characterized by a deficit in attention to the left side of space.
  • Understanding the time course of attentional allocation is crucial for comprehending recovery mechanisms.

Purpose of the Study:

  • To investigate reaction times (RTs) to lateralized visual stimuli in patients with left neglect, recovered patients, and controls.
  • To explore the temporal dynamics of spatial attention allocation during a simple motor reaction time task.

Main Methods:

  • Participants performed a simple motor reaction time task with lateralized visual stimuli.
  • Performance was analyzed based on the serial order of trials to assess changes over time.

Main Results:

  • Both neglect and recovered patients exhibited slower RTs to left-sided targets compared to controls.
  • Recovered patients demonstrated a 'novelty effect,' with greater left/right RT differences early in the task that diminished over time, unlike neglect patients whose performance remained stable.

Conclusions:

  • A trade-off between motor task learning and attentional reorientation mechanisms may explain practice-related changes in recovered patients.
  • The prefrontal cortex is hypothesized to play a key role in mediating both motor learning and recovery from neglect, including attention reorientation.

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