Some characteristics of selective attention in visual perception determined by vocal reaction time
DOI: 10.3758/bf03210367
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Summary
This study investigates the characteristics of selective attention in visual perception by utilizing vocal reaction time as the dependent variable, rather than the accuracy measures employed in prior research. The authors were motivated by the need to determine if variations in reporting accuracy observed in previous tachistoscopic studies reflected actual differences in processing speed. Previous work indicated that accuracy in identifying a target letter decreased as the number of irrelevant letters in a display increased, but improved if the target’s position was indicated 150 milliseconds before the display appeared. The current experiment aimed to replicate these findings using latency measures to support the interpretation that attentional selectivity involves differential processing times. The experimental design involved four subjects who viewed multiletter displays containing 4, 8, or 12 letters (A, T, U, H) presented via a three-field tachistoscope. A black bar indicator designated the target letter. Two indicator conditions were tested: a "simultaneous" condition where the indicator appeared with the display, and a "leading" condition where the indicator appeared 150 milliseconds prior to the display. Subjects were instructed to vocalize the target letter as quickly as possible while maintaining high accuracy, which exceeded 98%. Reaction times were recorded from display onset to the initial voicing of the letter. The results demonstrated significant main effects for display size, indicator condition, and subject, along with significant interactions between display size and indicator condition. Reaction times increased progressively as the display size grew from 4 to 12 elements. Specifically, in the simultaneous indicator condition, reaction time increased by 43 milliseconds when moving from 4 to 8 elements, and by an additional 27 milliseconds for 12 elements. In the leading indicator condition, reaction times were consistently shorter. The facilitation provided by the leading indicator was substantial for larger displays (81–82 milliseconds faster than simultaneous conditions for 8- and 12-element displays) but minimal for the 4-element display (48 milliseconds faster). Notably, the leading indicator largely eliminated the reaction time difference between 4- and 8-element displays, reducing it from 43 to 10 milliseconds, while the difference between 8- and 12-element displays remained approximately 27 milliseconds. The authors conclude that these findings confirm that variations in accuracy from previous studies reflect the time required for attentional selection. They propose a model of "gradual focusing in," where attention narrows from the entire visual field to the target location. This process is time-consuming and spatial; larger displays require more time to narrow the focus field to isolate the target. The leading indicator allows this spatial focusing to occur before the display appears, thereby reducing the processing load during the display presentation. The study bridges the gap between tachistoscopic accuracy studies and information-processing reaction time research, suggesting that selective attention operates through a serial encoding process preceded by parallel low-level processing.
Key finding
Vocal reaction times to identify a target letter increase with the number of irrelevant display elements, but this effect is largely eliminated when the target location is indicated 150 milliseconds before the display appears.
Methodology
lab_experiment
Sample size: 4
Provenance
The full processing record for this entry. Every stage of this paper's journey through the pipeline is logged — what ran, with which tool and model, how many attempts it took, and when it last completed. Discovered via author_sweep_intake on 2026-05-28 (2 acquisition events logged).
| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | author_sweep | — | — | 3 | 2026-05-28 |
| archive | success | canonical_url | — | — | 1 | 2026-06-04 |
| extract | success | cached | — | — | 3 | 2026-06-10 |
| clean | success | clean | — | — | 1 | 2026-06-04 |
| chunk | success | chunk | — | — | 1 | 2026-06-04 |
| embed | success | embed | Qwen/Qwen3-Embedding-8B | — | 1 | 2026-06-04 |
| enrich | failed | — | — | — | 4 | 2026-07-02 |
| promote | success | — | — | — | 1 | 2026-06-04 |
| summarize | success | llm | qwen3.6-27b-prismaquant | summ-v5 | 2 | 2026-06-10 |
| tag | success | vector_similarity | — | — | 15 | 2026-06-11 |
| verify | success | — | — | — | 2 | 2026-06-10 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.
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- Empirical Findings: behavioral performance data