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Higher cognitive load interferes with head-hand coordination: virtual reality-based study.

Adi Lustig1,2, Meytal Wilf1,2, Israel Dudkiewicz3,4

  • 1Center of Advanced Technologies in Rehabilitation, Sheba Medical Center, Ramat Gan, Israel.

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Cognitive load impacts head-hand coordination during motor tasks. Divided attention (DA) significantly reduces head-hand synchrony compared to sustained visual attention (SVA), affecting movement timing across all age groups.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Human Movement Science

Background:

  • Daily activities require decision-making and motor control, often under varying cognitive loads.
  • Head-hand coordination is crucial for executing motor functions efficiently.
  • Cognitive demands can influence motor behavior, but the precise mechanisms are not fully understood.

Purpose of the Study:

  • To investigate how different cognitive loads affect head-hand coordination.
  • To assess cognitive-induced changes in motor behavior using a virtual reality neurocognitive testing platform.
  • To analyze age-related differences in head-hand coordination under cognitive load.

Main Methods:

  • Developed a virtual reality adaptation of the Color Trails Test (VR-CTT) to assess sustained visual attention (SVA) and divided attention (DA).
  • Collected head and hand kinematics data from 122 healthy participants (ages 20-90) performing the VR-CTT.
  • Utilized cross-correlation analysis to quantify spatial coherence and phase shifts in head-hand movements.

Main Results:

  • High spatial coherence (R ≥ 0.76) between head and hand movements was observed in both SVA (Trails A) and DA (Trails B) conditions across all age groups.
  • A significant increase in head-hand time lags (head leading hand) was found in the DA condition compared to the SVA condition for all participants.
  • These findings indicate that increased cognitive resource allocation to divided attention tasks disrupts head-hand synchrony.

Conclusions:

  • Divided attention tasks impose a greater cognitive load, leading to reduced head-hand synchrony compared to sustained visual attention tasks.
  • The observed changes in head-hand coordination under cognitive load are consistent across young, middle-aged, and older adults.
  • Head-hand coordination serves as a sensitive indicator of cognitive-motor interactions and the impact of cognitive load on motor control.