Sensory Modality-Dependent Interplay Between Updating and Inhibition Under Increased Working Memory Load: An ERP...

Area of Science:

• Cognitive Neuroscience
• Human Psychology
• Neuroscience

Background:

• Working memory (WM) performance depends on updating and inhibition.
• The interaction of these functions under varying cognitive loads and sensory modalities is not fully understood.

Purpose of the Study:

• To investigate how sensory modality affects flanker interference under increasing WM loads.
• To explore the interplay between updating and inhibition across visual and auditory modalities.

Main Methods:

• Twenty-two participants completed a visual n-back task at three load levels (1-, 2-, 3-back).
• Flanker interference was assessed using visual (within-modality) and auditory (cross-modality) stimuli.
• Behavioral data (accuracy, reaction time) and event-related potentials (ERPs) were recorded.

Main Results:

• Increased WM load impaired accuracy and reaction time in both visual and auditory flanker conditions.
• Flanker interference emerged earlier (2-back) in the visual within-modality task compared to the cross-modality task (3-back).
• ERP data indicated heightened inhibitory demands (N200) in the within-modality condition at high load, while P300 amplitude varied differently across modalities with load.

Conclusions:

• The interaction between updating and inhibition is modulated by WM load and sensory modality.
• Cross-modality processing may facilitate more efficient cognitive resource distribution, particularly under high WM loads.
• Findings support a sensory modality-specific resource allocation mechanism in executive functions.