Sperling partial report 1960
Observers could report only a few letters from a brief display, but when cued to report one row they did well, suggesting a larger, fast-fading visual store.
Main paper: Sperling, G. (1960). The information available in brief visual presentations. Psychological Monographs: General and Applied, 74(11, Whole No. 498), 1–29. https://sites.socsci.uci.edu/~whipl/staff/sperling/PDFs/Sperling_PsychMonogr_1960.pdf
The question
Do people see more than they can report from a very brief display?
Design: experiment
The researchers set the conditions and compare outcomes between or within groups. Each profile says whether participants were randomly assigned.
A within-subjects comparison of two report methods. The partial-report method later became a paradigm in its own right.
Whole report
- Flash a letter array
- Name as many letters as possible
Result reportedA handful of letters
Partial report
- Flash a letter array
- Tone cues one row
- Report that row
Result reportedCued row reported well; benefit fades with delay
Original diagram drawn for this site from the descriptions in the sources. It is a simplified summary, not a figure from the paper.
Procedure
Observers saw arrays of letters flashed for a fraction of a second. In the whole-report condition they tried to name as many letters as they could. In the partial-report condition a tone just after the display told them which row to report. Because they did not know in advance which row would be cued, performance on the cued row estimates what was available across the whole array.
Sperling also varied how long after the display the cue came.
Findings
Whole report was limited to a handful of letters, while the cued row was reported well. That implies more information was available at the moment of the cue than whole report showed. The advantage faded as the cue was delayed.
Interpretation
The results support a brief, high-capacity visual store that fades quickly, later called iconic memory, from which only a limited amount can be read out before it is lost.
Limits on what it shows
- The study used a small set of highly practiced observers. Their performance need not represent an untrained viewer.
- Estimating information across the array depends on the cued row being a useful sample; attention and guessing strategies matter.
- A lower bound on briefly available information is not a photograph of everything seen. Letter recognition and reporting remain part of the task.
Ethics
The task was a set of brief visual judgments with volunteers, with little risk to participants.
Replication and reassessment
Sperling explicitly examined attention and guessing strategies when cues were delayed. The partial-report advantage supports a brief availability claim under these conditions. It does not mean that every visual detail is stored perfectly or can be retrieved after a long delay.
Think it through. An original practice question written for this site.
Why does the experimenter choose which row to cue after the display disappears, and not before?
Show a way to reason about it
If observers knew the row in advance they could look only at it, and the result would show attention, not what was available across the display. Cueing afterward means they must have stored the whole array to do well, so success on any row estimates the whole.
Nothing you think or select here is recorded.
Textbook connection
OpenStax Psychology 2e, 8.1 How Memory Functions
Related context on sensory memory. The section does not name Sperling.
Sources and access scope
Each label says how much of the source was opened while preparing this profile. An unopened source is listed so the claim can be checked, not because it was read.
- Sperling, G. (1960). The information available in brief visual presentations. Psychological Monographs: General and Applied, 74(11, Whole No. 498), 1–29. https://sites.socsci.uci.edu/~whipl/staff/sperling/PDFs/Sperling_PsychMonogr_1960.pdfOriginal researchSelected full-text sections inspected
Scanned pages 1, 4 and 6-10 visually inspected, including partial-report instructions, inference and delayed cues. This is a selected-page inspection, not a reading of all 29 pages.
- Spielman, R. M., Jenkins, W. J., & Lovett, M. D. (2020). Psychology 2e. OpenStax. https://openstax.org/books/psychology-2e/pages/8-1-how-memory-functionsTextbook contextSelected textbook passages inspected
Textbook context. The section describes sensory memory in general and does not discuss Sperling by name.