The spatial distribution and temporal dynamics of brain regions activated during the perception of object and non-object patterns

Frances A. Maratos, Stephen J. Anderson*, Arjan Hillebrand, Krish D. Singh, Gareth R. Barnes

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

Both animal and human studies suggest that the efficiency with which we are able to grasp objects is attributable to a repertoire of motor signals derived directly from vision. This is in general agreement with the long-held belief that the automatic generation of motor signals by the perception of objects is based on the actions they afford. In this study, we used magnetoencephalography (MEG) to determine the spatial distribution and temporal dynamics of brain regions activated during passive viewing of object and non-object targets that varied in the extent to which they afforded a grasping action. Synthetic Aperture Magnetometry (SAM) was used to localize task-related oscillatory power changes within specific frequency bands, and the time course of activity within given regions-of-interest was determined by calculating time-frequency plots using a Morlet wavelet transform. Both single subject and group-averaged data on the spatial distribution of brain activity are presented. We show that: (i) significant reductions in 10-25 Hz activity within extrastriate cortex, occipito-temporal cortex, sensori-motor cortex and cerebellum were evident with passive viewing of both objects and non-objects; and (ii) reductions in oscillatory activity within the posterior part of the superior parietal cortex (area Ba7) were only evident with the perception of objects. Assuming that focal reductions in low-frequency oscillations (< 30 Hz) reflect areas of heightened neural activity, we conclude that: (i) activity within a network of brain areas, including the sensori-motor cortex, is not critically dependent on stimulus type and may reflect general changes in visual attention; and (ii) the posterior part of the superior parietal cortex, area Ba7, is activated preferentially by objects and may play a role in computations related to grasping. © 2006 Elsevier Inc. All rights reserved.

Original languageEnglish
Pages (from-to)371-383
Number of pages13
JournalNeuroimage
Volume34
Issue number1
DOIs
Publication statusPublished - 1 Jan 2007

Keywords

  • action
  • affordance
  • attention
  • grasping
  • magnetoencephalography
  • MEG
  • objects
  • SAM
  • synthetic aperture magnetometry
  • vision

Fingerprint Dive into the research topics of 'The spatial distribution and temporal dynamics of brain regions activated during the perception of object and non-object patterns'. Together they form a unique fingerprint.

  • Cite this