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Intracortical Inhibition Within the Primary Motor Cortex Can Be Modulated by Changing the Focus of Attention
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Attentional fluctuations induce shared variability in macaque primary visual cortex.

George H Denfield1,2, Alexander S Ecker3,4,5,6, Tori J Shinn1,2

  • 1Department of Neuroscience, Baylor College of Medicine, Houston, TX, USA.

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This summary is machine-generated.

Attention fluctuations significantly impact correlated neuronal variability. Our study reveals attention

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Cognitive Neuroscience

Background:

  • Neuronal responses to identical stimuli often show correlated variability across populations.
  • Attention is hypothesized to reduce these correlations by suppressing shared noisy inputs.

Purpose of the Study:

  • To investigate the impact of fluctuating attentional states on correlated neuronal variability.
  • To differentiate the effects of attentional strength from attentional state variability.

Main Methods:

  • Developed a novel experimental paradigm to dissociate attentional strength from attentional state variability.
  • Analyzed neuronal responses to controlled visual stimuli under varying attentional conditions.

Main Results:

  • Attentional fluctuations significantly affect correlated variability at long timescales.
  • Attention-dependent reductions in correlations were observed at short timescales.
  • These effects were most prominent in cortical layers 2/3.

Conclusions:

  • Correlated neuronal variability can be substantially attributed to internal signal fluctuations, such as attention.
  • Findings support the role of attention as a feedback mechanism influencing neural population activity.