Visual information about object size and object position are retained differently in the visual brain: Evidence from grasping studies

Constanze Hesse, Louisa Miller, Gavin Buckingham

Research output: Contribution to journalArticle

11 Citations (Scopus)
6 Downloads (Pure)

Abstract

Many experiments have examined how the visual information used for action control is represented in our brain, and whether or not visually-guided and memory-guided hand movements rely on dissociable visual representations that are processed in different brain areas (dorsal vs. ventral). However, little is known about how these representations decay over longer time periods
and whether or not different visual properties are retained in a similar fashion.In three experiments we investigated how information about object size and object position affect grasping as visual memory demands increase. We found that position information decayed rapidly with increasing delays between viewing the object and initiating subsequent actions – impacting both the accuracy of the transport component (lower end-point accuracy) and the grasp component (larger grip apertures) of the movement. In contrast, grip apertures and fingertip forces remained well-adjusted to target size in conditions in which positional information was either irrelevant or provided, regardless of delay, indicating that object size is encoded in a more stable manner than object position. The findings provide evidence that different grasp-relevant properties are encoded
differently by the visual system. Furthermore, we argue that caution is required when making inferences about object size representations based on alterations in the grip component as these variations are confounded with the accuracy with which object position is represented. Instead fingertip forces seem to provide a reliable and confound-free measure to assess internal size estimations in conditions of increased visual uncertainty.
Original languageEnglish
Pages (from-to)531-543
Number of pages13
JournalNeuropsychologia
Volume91
Early online date21 Sep 2016
DOIs
Publication statusPublished - 1 Oct 2016

Keywords

  • perception
  • action
  • delay
  • grip forces
  • visual memory
  • dorsal-ventral

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