Resting GABA concentration predicts inhibitory control during an auditory Go-Nogo task

Area of Science:

• Neuroscience
• Cognitive Neuroscience
• Neuroimaging

Background:

• Inhibitory control is crucial for goal-directed behavior.
• Individual differences in response inhibition are significant, but underlying neurochemical and neurophysiological mechanisms are not fully understood.

Purpose of the Study:

• To investigate the relationship between behavioral response inhibition, GABA+ concentrations, and auditory sensory gating (SG).
• To explore the neurochemical and neurophysiological underpinnings of individual variability in inhibitory control.

Main Methods:

• Magnetoencephalography (MEG), magnetic resonance spectroscopy (MRS), and behavioral experiments were conducted on 19 healthy adults.
• Auditory sensory gating was assessed using a paired-stimulus paradigm.
• Behavioral response inhibition was evaluated using an auditory-driven Go-Nogo task.
• Resting GABA+ concentrations were measured in the superior temporal gyri using MRS.

Main Results:

• No significant hemispheric asymmetry was observed for GABA+ concentrations or auditory SG.
• Enhanced sensory gating (lower ratio) correlated with improved behavioral inhibition.
• Higher GABA+ concentrations were strongly associated with better inhibitory control.

Conclusions:

• Automatic neurophysiological processes, specifically auditory sensory gating, play a role in inhibitory control.
• Inhibitory neurotransmitters, such as GABA+, are important predictors of behavioral performance in response inhibition.
• These findings contribute to understanding the neurobiological basis of inhibitory control and its variability.