Ongoing task delays affect prospective memory more powerfully than filler task delays

Area of Science:

• Cognitive Psychology
• Human Memory

Background:

• Prospective memory (PM) research shows mixed effects of delay on recall.
• Traditionally, increasing delay between intention formation and cue presentation decreases PM performance.
• Some studies suggest delays may enhance PM through spontaneous rehearsal or reminders.

Purpose of the Study:

• To investigate the differential effects of two types of delays on prospective memory.
• To examine how delays within an ongoing task versus delays between intention and task initiation impact PM retrieval.

Main Methods:

• Participants completed tasks with varying durations of a filler task and an ongoing task.
• Two factors were manipulated between-subjects: filler task duration and ongoing task delay before the first PM cue.
• Delays tested were 6, 21, and 36 minutes.

Main Results:

• Increasing the delay within the ongoing task led to decreased prospective memory performance.
• Increasing the duration of the filler task nominally increased prospective memory performance.
• The effects of delay on PM appear dependent on the specific timing and nature of the delay interval.

Conclusions:

• Delays embedded within an ongoing task negatively impact PM, consistent with retrospective memory findings.
• Delays between intention formation and the start of the ongoing task may have complex or non-linear effects on PM.
• The findings highlight the importance of distinguishing between different types of delays in prospective memory research.