Sequential modulation of backward crosstalk and task-shielding in dual-tasking

Area of Science:

• Cognitive Psychology
• Human Performance
• Neuroscience

Background:

• The backward crosstalk effect (BCE) demonstrates improved Task 1 performance with spatially compatible Task 2 responses.
• BCE size is considered an indicator of Task 1 shielding from concurrent Task 2 processing.
• Previous research suggests parallel processing in response selection during dual-tasking.

Purpose of the Study:

• To investigate if previous trial compatibility influences the BCE, analogous to the Gratton effect.
• To explore sequential modulations of the BCE based on recent response compatibility.

Main Methods:

• Three experiments were conducted using dual-task paradigms.
• The compatibility of responses on preceding trials was manipulated.
• The magnitude of the backward crosstalk effect was measured under different sequential conditions.

Main Results:

• A significant Gratton-like sequential modulation of the BCE was observed.
• The BCE was substantial following a compatible trial.
• The BCE was absent or reversed following an incompatible trial.

Conclusions:

• Recent response incompatibility rapidly triggers bottom-up adjustments in cognitive processing.
• The degree of parallel processing during response selection is dynamically adjusted based on recent experiences.
• These findings offer insights into the adaptive nature of cognitive control in dual-task scenarios.