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Updated: Aug 5, 2025

Measurement of Neurophysiological Signals of Ignoring and Attending Processes in Attention Control

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Published on: July 5, 2015

GABAergic Involvement in Selective Attention.

Kaja Faßbender¹, Philine M Baumert¹, Maximilian W M Wintergerst²

¹University of Bonn, Germany.

Journal of Cognitive Neuroscience

|March 28, 2023

Summary

This summary is machine-generated.

Increased GABAA receptor activity, like that from lorazepam, widens attentional focus rather than slowing selectivity build-up. This impacts how individuals process sensory information and react to stimuli.

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Area of Science:

Neuroscience
Cognitive Psychology

Background:

Selective attention is crucial for managing sensory input.
The role of gamma-aminobutyric acid (GABA) in selective attention is not fully understood.
Benzodiazepines like lorazepam increase GABAA receptor activity and can slow cognitive task performance.

Purpose of the Study:

To investigate whether increased GABAA receptor activity slows attentional selectivity or broadens attentional focus.
To clarify the specific role of GABAergic neurotransmission in selective attention mechanisms.

Main Methods:

A double-blind, within-subjects study using lorazepam and placebo in 29 participants performing an extended flanker task.
Systematic manipulation of flanker number and position to assess spatial distribution of attention.
Delta plot analysis of reaction times (RTs) to characterize temporal build-up of selectivity.
Verification of task effects using an independent, unmedicated online sample (n=25).

Main Results:

Under placebo and in the unmedicated group, only the number, not position, of incongruent flankers affected RTs.
Lorazepam significantly impaired RTs compared to placebo, particularly with adjacent flankers.
Delta plot analysis indicated that lorazepam's effect was not due to slowed selectivity build-up, but persisted even with slower reactions.

Conclusions:

Increased GABAA receptor activity, induced by lorazepam, appears to widen attentional focus.
This widening of attentional focus, rather than a general slowing of processing, explains lorazepam's impact on selective attention performance.