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Interactions between phasic alerting and consciousness in the fronto-striatal network.

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Investigating brain activity during attention and perception reveals that while alerting networks correlate with conscious reports, only the thalamus shows interaction between attention and conscious perception. This highlights specific thalamo-cortical roles in consciousness.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Psychology

Background:

  • Conscious perception is limited, requiring attentional states like top-down amplification and vigilance.
  • The relationship between specific attentional systems (e.g., top-down orienting, phasic alerting) and conscious perception remains under-explored.

Purpose of the Study:

  • To investigate the neural mechanisms of endogenous spatial attention and phasic alertness.
  • To examine the interaction between these attentional systems and the conscious perception of near-threshold visual stimuli.

Main Methods:

  • Utilized neuroimaging techniques to monitor brain activity.
  • Presented near-threshold visual stimuli to participants under varying attentional states.
  • Correlated brain activation patterns with participants' conscious reports of perception.

Main Results:

  • Phasic alerting was associated with widespread cortical and subcortical brain activations, correlating highly with conscious reports.
  • A neural interaction between endogenous attention and conscious perception was specifically observed in the thalamus.
  • Brain regions including the anterior cingulate cortex, supplementary motor area, frontal eye fields, thalamus, and caudate nucleus were linked to perceptual consciousness.

Conclusions:

  • Not all attentional systems equally enhance conscious perception.
  • Thalamo-cortical circuits play a crucial role in the interplay between alerting mechanisms and conscious awareness.
  • Differentiates the neural underpinnings of distinct attentional systems in relation to conscious experience.