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Area of Science:

  • Cognitive Neuroscience
  • Neuroscience
  • Visual Perception

Background:

  • Natural perception involves forming multifaceted expectations about upcoming stimuli, including features and locations.
  • Previous research often isolated spatial location and stimulus features, leaving unclear if feature expectations are spatially specific.
  • Feature-based attention is known to spread to unattended locations, raising questions about distinct neural mechanisms for expectation versus attention.

Purpose of the Study:

  • To investigate whether feature-based expectations are spatially specific.
  • To determine if the neural mechanisms of feature-based expectation differ from feature-based attention.
  • To inform the debate on the specificity of neural mechanisms by examining spatial effects of expectation violations.

Main Methods:

  • Utilized functional magnetic resonance imaging (fMRI) to probe sensory processing across the visual field.
  • Induced specific feature expectations at particular locations in participants.
  • Examined the neural responses to unexpected stimuli following expectation induction.

Main Results:

  • An enhanced sensory response was observed for unexpected stimuli.
  • This enhanced response was specifically elicited by expectation violations at the cued location.
  • However, the neural consequences of expectation violations spread to cortical areas processing the opposite visual hemifield.

Conclusions:

  • Feature-based expectation effects can be spatially specific at the point of expectation.
  • Expectation violations, however, can lead to spatially non-specific neural consequences, increasing gain across the visual field.
  • This suggests a potential divergence in neural mechanisms between expectation formation and the processing of expectation violations.