Spatial and sustained attention in relation to smoking status: behavioural performance and brain activation patterns

Area of Science:

• Neuroscience
• Cognitive Psychology
• Neuroimaging

Background:

• Chronic nicotine exposure from smoking causes structural and molecular brain changes.
• Nicotine is known to enhance attentional functions.

Purpose of the Study:

• Investigate neural mechanisms of visuospatial and sustained attention in smokers versus non-smokers.
• Examine the impact of smoking on brain activity during attention tasks.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was employed.
• Visuospatial attention was assessed using a location-cueing paradigm.
• Sustained attention was measured by response speed changes over time.

Main Results:

• Smokers showed enhanced basal forebrain activity during invalid trials, linked to parietal cortex activation.
• Higher expired carbon monoxide levels correlated with increased parietal activation and faster responses.
• Smokers exhibited response slowing and recruitment of the right supramarginal gyrus over time, with decreased visual cortex activity.

Conclusions:

• Smokers display altered attentional functions compared to non-smokers.
• Neural and behavioral attention differences in smokers are partly modulated by residual nicotine levels.
• The study provides evidence for neuroadaptive changes in attention networks due to smoking.