Ageing differentially affects neural processing of different conflict types-an fMRI study.

Area of Science:

• Cognitive Neuroscience
• Neuroimaging
• Aging Research

Background:

• Ageing impacts cognitive functions, including interference control and conflict resolution.
• Evidence suggests ageing affects specific components of interference control rather than the general ability.
• Different conflict types (stimulus-stimulus vs. stimulus-response) engage distinct cognitive processes and neural networks.

Purpose of the Study:

• To investigate the differential effects of ageing on stimulus-stimulus (S-S) and stimulus-response (S-R) conflicts.
• To compare neural activation patterns between younger and older adults during conflict processing using functional magnetic resonance imaging (fMRI).

Main Methods:

• Utilized a combined Flanker task (measuring S-S conflict) and Stimulus Response Conflict (SRC) task (measuring S-R conflict).
• Employed fMRI to examine brain activity in younger and older adult participants during task performance.
• Analyzed behavioral data to assess conflict effects across age groups.

Main Results:

• Behavioral analysis indicated larger SRC effects in elderly participants.
• fMRI revealed overlapping activation in the caudate nucleus, cingulate gyrus, and middle occipital gyrus (MOG) for both age groups during Flanker (S-S) conflict.
• Older adults exhibited additional activation in parietal and frontal areas during Flanker conflict.
• No common brain regions were activated by both age groups during SRC (S-R) conflict processing.

Conclusions:

• Ageing has distinct impacts on different types of cognitive conflict.
• While S-S conflict processing shows some shared neural resources across age groups, S-R conflict processing appears to be differentially affected by ageing, recruiting distinct neural patterns in older adults.