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Stephanie Badde1, Tobias Heed, Brigitte Röder

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Summary
This summary is machine-generated.

Tactile spatial processing involves transforming skin-based coordinates to external ones. This study shows that integrating these coordinates for touch localization is not automatic, requiring cognitive control.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Somatosensation

Background:

  • Accurate touch localization requires transforming sensory input from a body-centered (anatomical) frame to an external, environmental frame.
  • Previous research suggests both frames are integrated for spatial awareness, but the automaticity of this integration is unclear.

Purpose of the Study:

  • To investigate whether the calculation and integration of external coordinates for tactile spatial representation are automatic processes.
  • To determine the role of cognitive load in tactile coordinate integration.

Main Methods:

  • Participants performed a temporal order judgment (TOJ) task involving tactile stimuli on both hands in crossed and uncrossed body postures.
  • A concurrent working memory task of varying difficulty and type (verbal vs. spatial) was used to manipulate processing load.
  • The 'crossing effect' (performance difference between crossed and uncrossed postures) was measured under different cognitive loads.

Main Results:

  • The crossing effect, indicative of external coordinate influence, was significantly reduced under increased processing load.
  • This reduction in the crossing effect was observed regardless of whether the working memory task was verbal or spatial.
  • Study 2 demonstrated that the crossing effect varied with the difficulty of the secondary task when load was adaptively adjusted.

Conclusions:

  • The integration of tactile coordinates for touch localization is not a fully automatic process and is sensitive to cognitive load.
  • While the initial transformation (remapping) of anatomical to external coordinates may be automatic, their subsequent integration requires controlled processing.
  • These findings highlight the role of top-down control in integrating spatial information for accurate touch perception.