"Just do it when you get a chance": the effects of a background task on primary task performance

Area of Science:

• Cognitive Psychology
• Human-Computer Interaction
• Neuroscience

Background:

• Multitasking performance is a key area of cognitive research.
• Existing paradigms like psychological refractory period and task-switching have limitations.
• A new prioritized-processing paradigm was developed to study multitasking interference.

Purpose of the Study:

• To investigate multitasking performance using a novel prioritized-processing paradigm.
• To determine if absolute priority can protect a primary task from interference.
• To explore the mechanisms underlying multitasking interference.

Main Methods:

• Two experiments were conducted using the prioritized-processing paradigm.
• Participants responded to a high-priority primary task only when action was needed.
• A low-priority background task was responded to only when the primary task required no action.

Main Results:

• Performance on the primary task was worse compared to isolated task performance.
• Multitasking interference was observed in both task-repetition and task-alternation trials.
• Primary task responses were influenced by background task stimulus-response compatibility, indicating background task activation.

Conclusions:

• The prioritized-processing paradigm does not fully protect the primary task from multitasking interference.
• Task-switching costs do not solely explain the observed interference.
• The findings suggest underlying mechanisms common to psychological refractory period and task-switching paradigms.
• The prioritized-processing paradigm offers a valuable tool for studying multitasking interference.