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The tradeoff between item and order information in short-term memory does not depend on encoding time.
Dominic Guitard1, Nelson Cowan2
1Ecole de Psychologie, Universite de Moncton.
Journal of Experimental Psychology. Human Perception and Performance
|November 10, 2022
Summary
Dividing attention during memory encoding impacts item and order recall differently. This study found that attention primarily affects the maximum level of order encoding, not its speed, explaining why order memory suffers more when attention is split.
Area of Science:
- Cognitive Psychology
- Neuroscience
- Memory Research
Background:
- Encoding verbal information for memory can prioritize either item identity or item order.
- Divided attention during encoding incurs a cost, disproportionately affecting order information recall compared to item information.
- Previous research suggests an asymmetry in the cost of divided attention for item versus order memory.
Purpose of the Study:
- To investigate the underlying mechanisms of the asymmetry in encoding costs for item versus order information.
- To differentiate between a rate hypothesis and an asymptote hypothesis explaining the observed memory encoding differences.
- To determine whether divided attention affects the speed or the maximum achievable level of encoding for item and order information.
Main Methods:
- Three experiments were conducted using varying trial durations to present stimuli for encoding.
- Participants were instructed to prepare for either an item fragment completion test, an order reconstruction test, or both.
- Encoding performance was analyzed across different preparation conditions and presentation times to distinguish between rate and asymptote effects.
Main Results:
- Results supported the asymptote hypothesis, indicating that divided attention more severely limits the maximum level of order encoding than item encoding.
- No significant effect of divided attention was found on the encoding rates for either item or order information.
- The findings suggest that the allocation of attention to item or order processing can be separated from the duration of encoding time.
Conclusions:
- Divided attention during memory encoding impacts the asymptote, or ceiling, of order information processing more than item processing.
- The observed asymmetry in encoding costs is explained by a diminished maximum capacity for order memory, not a slower encoding speed.
- This research clarifies the distinct effects of attention allocation on item and order memory, independent of encoding duration.
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