Parallel effects of memory set activation and search on timing and working memory capacity

Area of Science:

• Cognitive Psychology
• Human Performance
• Time Perception

Background:

• Accurate time interval estimation is crucial for daily activities.
• Concurrent tasks typically interfere with time estimation, but some processes do not.
• The Timing and Complex-Span Hypothesis posits that interference occurs if and only if a process is related to complex span.

Purpose of the Study:

• To test the Timing and Complex-Span Hypothesis by examining the effect of memory set activation on concurrent timing.
• To investigate whether memory set activation interferes with time estimation in dual-task conditions.

Main Methods:

• Experiments involved single-task memory search and dual-task conditions combining memory search with concurrent timing.
• Memory set activation and set size were manipulated across experiments.
• Measures included reaction time and time production accuracy.

Main Results:

• Memory set activation increased reaction time but did not significantly affect time production in Experiment 1.
• Experiment 2 showed a puzzling interaction between activation and set size for time productions.
• Experiment 3, using a related task, found set size lengthened time production, but memory activation had no significant effect.

Conclusions:

• The results support the Timing and Complex-Span Hypotheses.
• Findings also suggest a sequential organization of memory activation and search.
• This organization predicts additive effects on reaction time and multiplicative effects on accuracy, which were observed.