Linking inter-individual differences in the perceptual load effect to spontaneous brain activity.

Area of Science:

• Neuroscience
• Cognitive Psychology

Background:

• High task load reduces peripheral distractor interference, a phenomenon known as the perceptual load effect (PLE).
• Individual differences in PLE and their neural correlates during resting-state remain underexplored.

Purpose of the Study:

• To investigate individual differences in PLE.
• To examine the relationship between spontaneous brain activity and PLE during resting-state using resting-state functional Magnetic Resonance Imaging (fMRI).

Main Methods:

• Resting-state fMRI was employed to measure spontaneous brain activity.
• Amplitude of low-frequency fluctuations (ALFFs) were analyzed in relation to individual PLE.

Main Results:

• Significant individual differences in PLE were identified.
• PLE was significantly associated with ALFFs in the left inferior temporal gyrus (ITG) and left precentral/postcentral gyrus.
• These brain regions are implicated in visual attention and behavioral response control.

Conclusions:

• The perceptual load effect is measurable and exhibits significant individual variability.
• Spontaneous brain activity, particularly in the ITG and precentral/postcentral gyrus, is associated with individual differences in PLE.
• Findings suggest that competition for limited attentional capacity and response control mechanisms contribute to PLE modulation.