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Hand-centred coding of target location in visuo-spatial working memory.

S Chieffi1, D A Allport, M Woodin

  • 1Dipartimento di Fisiologia Umana e Funzioni Biologiche Integrate Filippo Bottazzi, Seconda Università di Napoli, Italy. schieffi@unina.it

Neuropsychologia
|April 24, 1999
PubMed
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This study investigated how visual target locations are remembered in spatial short-term memory. Results suggest locations are encoded using a hand-centered reference frame, impacting pointing accuracy over time.

Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Human Factors

Background:

  • Understanding spatial short-term memory is crucial for explaining how we interact with our environment.
  • The frame of reference used for encoding spatial information remains a key area of investigation.

Purpose of the Study:

  • To determine the frame of reference (e.g., body-centered, hand-centered) used in visuo-spatial short-term memory.
  • To investigate how memory encoding affects delayed manual pointing accuracy.

Main Methods:

  • Visuo-spatial short-term memory task involving delayed manual pointing to a remembered visual target.
  • Experiment manipulated hand starting position (near/far) and viewing conditions (light/dark).
  • Measured pointing errors in the sagittal axis across different time delays (3s and 30s).

Related Experiment Videos

Main Results:

  • Consistent undershoot error (10-30%) in pointing accuracy relative to the hand's starting position.
  • Pointing errors increased with longer time delays, indicating memory decay.
  • Errors were observed regardless of the hand's starting position.

Conclusions:

  • Findings support a hand-centered frame of reference hypothesis for encoding visual target locations in spatial short-term memory.
  • Suggests the involvement of motor- or action-related representations in visuo-spatial working memory.