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Interpersonal interactions for haptic guidance during maximum forward reaching.

S M Steinl1, L Johannsen2

  • 1Department of Sport and Health Science, Technical University Munich, Munich, Germany.

Gait & Posture
|January 10, 2017
PubMed
Summary
This summary is machine-generated.

Interpersonal coordination during reaching tasks is enhanced when caregivers provide haptic guidance without vision. This tactile feedback, or interpersonal touch (IPT), helps patients maintain stability and control during movement.

Keywords:
Body swayForward reachInterpersonal touchSocial postural coordination

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Area of Science:

  • Human motor control
  • Haptic perception
  • Interpersonal coordination

Background:

  • Caregiver-patient interactions frequently involve interpersonal coordination (IPC) through haptic and visual cues.
  • Understanding how haptic feedback influences IPC is crucial for optimizing therapeutic interventions.
  • Previous research has not fully elucidated the specific roles of different haptic feedback types in joint reaching tasks.

Purpose of the Study:

  • To investigate spontaneous interpersonal coordination (IPC) during a joint maximum forward reaching task in healthy individuals.
  • To examine the effects of different haptic feedback conditions, including interpersonal touch (IPT) and object presence (OBT), on IPC.
  • To determine how visual information available to the 'contact provider' (CP) influences the coordination dynamics.

Main Methods:

  • A joint maximum forward reaching task was performed by a blind-folded 'contact receiver' (CR; n=22) and a 'contact provider' (CP; n=2).
  • Haptic feedback was manipulated by the presence of a light object (OBT) at the CR's fingertips and/or provision of IPT by the CP.
  • CP provided IPT with or without vision, or manually tracked with vision but without IPT. CR's Centre-of-Pressure (CoP) and wrist velocity, along with interpersonal cross-correlations and time lags, were measured.

Main Results:

  • The presence of an object (OBT) increased the CR's reaching amplitude and reduced postural variability.
  • CR's variability was minimized when the CP applied interpersonal touch (IPT) without visual input.
  • Object presence (OBT) decreased the overall strength of interpersonal coordination (IPC), while correlation time lags indicated the CR typically led the CP.

Conclusions:

  • Haptic guidance, particularly interpersonal touch (IPT) without vision, can significantly enhance interpersonal coordination (IPC) and reduce variability in reaching tasks.
  • The findings suggest a potential shift in the CR's coordination strategy, relying more on the CP's haptic cues when visual information is limited.
  • In clinical settings, considering the sensorimotor states of both interacting partners and optimizing haptic guidance, especially IPT, may improve therapeutic outcomes.