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Related Experiment Video

Updated: Jun 21, 2026

A Cognitive Paradigm to Investigate Interference in Working Memory by Distractions and Interruptions
10:38

A Cognitive Paradigm to Investigate Interference in Working Memory by Distractions and Interruptions

Published on: July 16, 2015

Dual-task interference: attentional and neurophysiological influences.

Cynthia Y Hiraga1, Michael I Garry, Richard G Carson

  • 1Escola de Artes, Ciências e Humanidades, Universidade de São Paulo, Av Arlindo Bétio, 1000, Ermelino Matarazzo, São Paulo-SP, CEP 03828-000, Brazil.

Behavioural Brain Research
|July 28, 2009
PubMed
Summary
This summary is machine-generated.

Dual-task interference, or performing two tasks at once, can be worsened by interactions in the brain's motor cortex. This study used transcranial magnetic stimulation (TMS) to show that these motor cortex interactions contribute to performance decline during dual motor tasks.

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Last Updated: Jun 21, 2026

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Area of Science:

  • Neuroscience
  • Motor Control
  • Cognitive Psychology

Background:

  • Dual-task interference, the performance decline when performing multiple tasks simultaneously, is often attributed to limited attentional resources.
  • Interactions within the primary motor cortex, known as activity-dependent coupling, may also contribute to dual-task interference, particularly during concurrent motor tasks.

Purpose of the Study:

  • To investigate the role of activity-dependent coupling in the primary motor cortex during dual-task interference.
  • To differentiate the contributions of activity-dependent coupling and attentional processes to dual-task performance.

Main Methods:

  • Transcranial magnetic stimulation (TMS) was employed to measure corticomotor excitability and activity-dependent coupling.
  • Participants performed single and dual tasks, including a bimanual coordination task and a foot-tapping reaction time (RT) task.
  • Task prioritization was manipulated to assess its effect on dual-task interference and coupling.

Main Results:

  • Activity-dependent coupling within the leg corticomotor pathway increased during dual-task performance compared to single-task performance, correlating with increased RT.
  • Dual-task interference was observed for both dual motor tasks and motor-cognitive tasks, but activity-dependent coupling was only present for dual motor tasks.
  • Prioritizing the RT task reduced interference but did not eliminate it, and did not affect the contribution of activity-dependent coupling.

Conclusions:

  • Activity-dependent coupling in the motor cortex contributes to dual motor-task interference, but attentional processes appear to be more significant.
  • Attentional mechanisms, operating upstream of the corticomotor system, are more detrimental to performance than motor cortex coupling.
  • Activity-dependent coupling's contribution to dual-task interference may not be modulated by attentional processes or task prioritization.