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Related Experiment Videos

Attention accesses multiple reference frames: evidence from visual neglect.

M Behrmann1, S P Tipper

  • 1Carnegie Mellon University, USA. behrmann+@cmu.edu

Journal of Experimental Psychology. Human Perception and Performance
|March 9, 1999
PubMed
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Patients with unilateral spatial neglect struggle with simultaneous spatial attention. Neglect severity depends on the probability of targets appearing in location- or object-based frames of reference.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Spatial Cognition

Background:

  • Normal participants utilize both location- and object-based frames of reference for selective attention.
  • Unilateral spatial neglect (USN) is a cognitive deficit often resulting from right-hemisphere brain lesions.

Purpose of the Study:

  • To investigate how patients with USN process spatial information across different frames of reference.
  • To determine if USN affects simultaneous access to location- and object-based spatial coordinates.
  • To examine the influence of target probability on neglect severity within each reference frame.

Main Methods:

  • The study involved patients diagnosed with unilateral spatial neglect following a right-hemisphere lesion.
  • Participants' ability to detect information was assessed using both location- and object-based spatial coordinates.

Related Experiment Videos

  • The probability of target appearance within each reference frame was systematically manipulated.

    • Main Results:

    • Patients with USN exhibited deficits in detecting information on the contralateral left side in both location- and object-based frames simultaneously.
    • The severity of spatial neglect was modulated by the probability of target occurrence within a specific reference frame.
    • Increased probability of sampling targets in a particular frame exacerbated neglect within that frame.

    Conclusions:

    • Unilateral spatial neglect impairs simultaneous spatial attention across multiple reference frames.
    • Attentional allocation to spatial reference frames can be flexibly and strategically adjusted based on task demands and probabilities.
    • These findings offer insights into the neural mechanisms underlying spatial attention and neglect in brain-lesioned patients.