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How do we select perceptions and actions? Human brain imaging studies

G Rees1, C D Frith

  • 1Wellcome Department of Cognitive Neurology, Institute of Neurology, London, UK. g.rees@fil.ion.ucl.ac.uk

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|October 14, 1998
PubMed
Summary
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Human attention modulates brain activity through gain control and bias signals, influencing how we perceive information. The processing of ignored stimuli depends on task difficulty, as proposed by Lavie

Area of Science:

  • Cognitive Neuroscience
  • Neuroimaging
  • Human Perception

Background:

  • Human perception and action are selective, suggesting interactions between sensorimotor and attentional processes.
  • Understanding perceptual selection mechanisms is crucial for explaining how the brain filters information.

Purpose of the Study:

  • To investigate the neural mechanisms underlying perceptual selection using functional imaging.
  • To explore the processing of irrelevant stimuli that are not attended to.
  • To examine how attentional modulation affects cerebral blood flow patterns.

Main Methods:

  • Positron emission tomography (PET) and functional magnetic resonance imaging (fMRI) were employed.
  • Experiments manipulated non-spatial visual and auditory attention.

Related Experiment Videos

  • Behavioral studies assessed the processing of ignored visual motion.

    • Main Results:

    • Two distinct patterns of cerebral blood flow modulation were identified: gain control and bias signals.
    • Attention primarily influenced visual and auditory cortex via bias signals.
    • Evidence supports Lavie's theory, indicating ignored stimulus processing varies with perceptual load.

    Conclusions:

    • Attentional processes modulate sensorimotor systems through distinct neural mechanisms.
    • Bias signals play a dominant role in modality-specific cortical attention.
    • The degree of processing for ignored stimuli is contingent on task perceptual load.