Caffeine and cognition in functional magnetic resonance imaging

Area of Science:

• Neuropharmacology
• Cognitive Neuroscience
• Neuroimaging

Background:

• Caffeine consumption is ancient, known for improving attention, memory, and psychomotor function.
• Caffeine primarily acts via adenosine receptor antagonism, with secondary effects on other neurotransmitters.
• Functional MRI (fMRI) is increasingly used in neuropharmacology, but caffeine's vasoconstrictive properties may affect fMRI signals.

Purpose of the Study:

• To review neuroimaging findings on caffeine's effects on fMRI contrast.
• To examine how caffeine influences neuronal activity related to cognition.
• To understand the neurobiological underpinnings of caffeine's behavioral effects.

Main Methods:

• Review of existing neuroimaging studies, particularly those using fMRI.
• Analysis of studies investigating caffeine's impact on attention, memory, and executive functions.
• Discussion of caffeine's influence on the blood oxygen level dependent (BOLD) contrast in fMRI.

Main Results:

• Limited studies exist on caffeine's direct effects on fMRI measures.
• Previous research indicates caffeine modulates brain regions involved in attention and executive functions (e.g., thalamus, medial frontopolar cortex, anterior cingulate cortex).
• Caffeine can stabilize neuronal activation patterns during cognitive tasks.

Conclusions:

• Caffeine's impact on fMRI contrast mechanisms requires further investigation.
• Neuroimaging reveals caffeine's modulatory role in brain networks supporting cognition.
• Understanding caffeine's neurobiological effects is crucial for interpreting cognitive enhancement and fMRI findings.