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Creating Objects and Object Categories for Studying Perception and Perceptual Learning
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Spatial imagery in haptic shape perception.

Simon Lacey1, Randall Stilla1, Karthik Sreenivasan2

  • 1Department of Neurology, Emory University, Atlanta, GA, USA.

Neuropsychologia
|July 15, 2014
PubMed
Summary
This summary is machine-generated.

This study reveals distinct neural pathways for visual object imagery and spatial imagery. Visual object imagery is more strongly linked to familiar shapes, while spatial imagery connects more with unfamiliar shapes, refining our understanding of multisensory object representation.

Keywords:
Effective connectivityGranger causalityMultisensoryObject familiarityfMRI

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Sensory Processing

Background:

  • The lateral occipital complex (LOC) is activated by haptic shape perception, suggesting a role in multisensory object representation.
  • Object familiarity modulates the relationship between visual imagery and haptic shape perception.

Purpose of the Study:

  • To investigate whether spatial imagery (spIMG) shows stronger neural correlations with unfamiliar haptic shapes (uHS) than familiar haptic shapes (fHS).
  • To test a refined model of multisensory object representation involving visual and spatial imagery.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to measure brain activity.
  • Inter-task correlations of blood oxygenation level-dependent (BOLD) signal magnitude and effective connectivity (EC) analyses were employed.
  • Deconvolution of the hemodynamic response function from BOLD time series inferred neuronal activity.

Main Results:

  • Spatial imagery (spIMG) exhibited more shared effective connectivity pathways with unfamiliar haptic shapes (uHS) than familiar haptic shapes (fHS).
  • Visual object imagery (objIMG) showed stronger effective connectivity with familiar haptic shapes (fHS) than unfamiliar haptic shapes (uHS).
  • BOLD signal correlations for spIMG showed some overlap with both fHS and uHS, particularly in parietal regions.

Conclusions:

  • The findings support a model where spatial imagery is more related to unfamiliar shapes, and visual object imagery is more related to familiar shapes.
  • The study refines the understanding of how object familiarity influences multisensory object representation in the brain.
  • While the basic architecture of the model is supported, some adjustments may be needed.