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Related Experiment Video

Updated: Jul 3, 2026

Measuring Attention and Visual Processing Speed by Model-based Analysis of Temporal-order Judgments

Measuring Attention and Visual Processing Speed by Model-based Analysis of Temporal-order Judgments

Published on: January 23, 2017

Attention modulates set representation by statistical properties.

Jan W de Fockert¹, Alexander P Marchant

¹Department of Psychology, Goldsmiths, University of London, London, England. j.de-fockert@gold.ac.uk

Perception & Psychophysics

|July 11, 2008

Summary

This summary is machine-generated.

Observers" estimations of average object size are biased by the single item they focus on. This suggests visual perception of statistical properties may not always involve accurate averaging of entire sets.

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Area of Science:

Cognitive Psychology
Visual Perception

Background:

Previous research suggested accurate estimation of mean object size.
This implied sets are represented by statistical properties like mean size.

Purpose of the Study:

To investigate if mean size estimations are always accurate.
To determine the influence of focused attention on set size perception.

Main Methods:

Participants directed visual attention to a single object within a set.
Mean size estimations were recorded.
Experiment 1: Size was the search criterion. Experiment 2: Size was not the search criterion.

Main Results:

Mean size estimations were significantly influenced by the size of the attended item.
This effect occurred irrespective of whether size was the primary search criterion.

Conclusions:

Observers do not consistently average all items in a set for mean size estimation.
Attended item features can bias estimations, or estimations may rely on subset means.