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Decrease in prefrontal hemoglobin oxygenation during reaching tasks with delayed visual feedback: a near-infrared

Sotaro Shimada1, Kazuo Hiraki, Goh Matsuda

  • 1PRESTO, Japan Science and Technology Corporation, Japan. shimada@ardbeg.c.u-tokyo.ac.jp

Brain Research. Cognitive Brain Research
|July 23, 2004
PubMed
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Delayed visual feedback disrupts hand reaching, causing overreaching and reduced prefrontal cortex activity. The brain adapts to this delay, with reduced blood flow correlating to performance errors.

Area of Science:

  • Neuroscience
  • Motor Control
  • Human Movement Science

Background:

  • Accurate hand movement relies on visual feedback.
  • Spatial visual feedback alterations are well-studied, but temporal delays are less explored.
  • Understanding visual feedback timing is key to visuomotor control.

Purpose of the Study:

  • Investigate the impact of delayed visual feedback on reaching tasks.
  • Measure prefrontal cortical activity during delayed visual feedback.
  • Explore the relationship between brain activity and performance during visuomotor adaptation.

Main Methods:

  • Twelve subjects performed reaching tasks with 0 ms (normal) and 200 ms (delay) visual feedback.
  • Near-infrared spectroscopy (NIRS) measured prefrontal cortical activity (oxy- and total-hemoglobin).

Related Experiment Videos

  • Reaching performance errors and brain activity changes were analyzed.

    • Main Results:

    • Visual feedback delay significantly impaired reaching performance, leading to overreaching.
    • Subjects showed gradual adaptation to the visual delay over time.
    • Marked decreases in oxy- and total-hemoglobin were observed in the dorsal prefrontal cortex during the delay condition.
    • These hemodynamic changes correlated significantly with task performance errors.

    Conclusions:

    • Delayed visual feedback necessitates visuomotor recalibration, reflected in dorsal prefrontal cortex activity.
    • The observed prefrontal hemodynamic changes are task-induced and linked to error processing.
    • This study highlights the critical role of precise visual timing in motor control and adaptation.