Hierarchical control of cognitive processes: switching tasks in sequences

Area of Science:

• Cognitive Psychology
• Neuroscience
• Human Behavior

Background:

• Cognitive processes involve hierarchical control, managing complex tasks through sequential and task-level processing.
• Understanding task-switching dynamics is crucial for elucidating executive functions and working memory operations.

Purpose of the Study:

• To investigate the relationship between sequence-level and task-level processing in explicit, memorized task sequences.
• To examine how sequence initiation times, influenced by complexity and preparation, affect task-switching costs.
• To provide insights into the maintenance and instantiation of hierarchical control structures in working memory.

Main Methods:

• Four experiments were conducted involving task-switching paradigms.
• Sequence initiation times were manipulated based on sequence complexity, preparation duration, and transition type (repetition vs. switch).
• Switch costs were analyzed in relation to sequence initiation time effects and serial position.

Main Results:

• Sequence initiation times, varying with complexity and preparation, perturbed switch costs in task-switching performance.
• A consistent finding of no switch cost at the first serial position across sequences was observed.
• These effects suggest the active role of sequence-level processes in maintaining hierarchical control structures.

Conclusions:

• Hierarchical control in cognitive processes is supported by the interplay of sequence- and task-level processing.
• The study provides evidence for the role of working memory in maintaining hierarchical control structures.
• Findings contribute to a deeper understanding of task set, cognitive control, and their relation to motor programming and serial memory.