Attention
How different types of memory load affect visual distraction
Open access · cc by · source: Europe PMC
While loading mental control processes makes us more easily distracted, loading visual memory actually helps us block out irrelevant sights.
How this study connects
Role on claims
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Based on a single study, visual memory load and verbal memory load have opposing effects on distractibility: loading visual memory helps block visual distractors, while loading verbal memory increases distractor interference.
Evidence for the claim as stated.
A busier mind is not uniformly a more distractible one — it depends what it is busy with.
Load changes distractibility, and the direction depends on which load. Increasing visual working-memory load at encoding or maintenance reduced distractor interference, while loading verbal working memory increased it (pooled r = −.31 across 56 participants). Raising perceptual load cut task-unrelated thoughts from 60.06% to 44.87%.
Evidence for the claim as stated.
Increasing the memory load of meaningless visual symbols significantly reduces an individual's susceptibility to visual distraction, whereas loading verbal memory actually increases distraction.
Evidence for the claim as stated.
Study at a glance
- Design
- Human experiment — Within-subject VSTM load (1 vs 4 items) crossed with a letter flanker task across encoding vs delay; separate verbal-load experiments
- N
- N=56 · Pooled VSTM experiments: 17 (1a) + 22 (1b) + 17 from 2b; additional verbal-load ns not in that pool
- Population
- Adults with normal or corrected vision recruited from the UCL participant pool
- Outcome
- Flanker response-competition RT: visual STM load reduced distractor interference; verbal WM load increased it
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How different types of memory load affect visual distraction
These passages occur verbatim in the stored paper text. They support the points listed below; they do not verify every statement in the explanation.
one item in the low-load memory set array
Load was manipulated by varying the number of items in the memory set array (one in the low-load and four in the high-load conditions).
56 participants pooled together from three experiments
To further investigate the effects of VSTM maintenance load on distractor processing, we pooled together data from 56 participants from the three experiments that used a VSTM task with similar methods: Experiment 1a (VSTM encoding load), Experiment 1b (VSTM maintenance load using colored squares), and Experiment 2b (VSTM maintenance load using meaningless shapes).
Key findings
The studies showed that increasing visual memory load—whether during encoding or maintenance—significantly reduced distractor interference. Conversely, loading verbal working memory with letters increased distractor interference. A pooled analysis of 56 participants revealed a significant negative correlation of r = −.31 between visual memory capacity estimates and distraction response times.
Methodology
Researchers tested how different memory demands affect distraction using a visual search task combined with a working memory task. In Experiment 1a, seventeen participants saw a visual search display during the encoding of either one or four colored squares. Experiment 1b tested twenty-two participants using the same task but presented the visual search during the memory retention delay. Experiment 2 compared verbal memory load using letters with visual memory load using meaningless symbols.
Limitations
This study does not show how these visual memory load effects would apply to non-visual modalities like touch or hearing. The visual search task also specifically used a low perceptual load, meaning these findings might not apply to complex search environments where target stimuli are harder to find. Finally, several of the individual experiments relied on relatively small samples, such as only twelve participants in Experiment 2a.
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