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Related Experiment Video

Updated: May 10, 2026

Comparing the Affinity of GTPase-binding Proteins using Competition Assays

Comparing the Affinity of GTPase-binding Proteins using Competition Assays

Published on: October 8, 2015

Grouping principles in direct competition.

Filipp Schmidt¹, Thomas Schmidt

¹University of Kaiserslautern, Social Sciences, Experimental Psychology, Erwin-Schrödinger-Str. Geb. 57, D-67663 Kaiserslautern, Germany. filipp.schmidt@sowi.uni-kl.de

Vision Research

|June 15, 2013

Summary

This summary is machine-generated.

We developed a new primed flanker task to measure perceptual grouping. Stronger grouping in targets slowed responses, while prime grouping boosted motor responses, revealing differences in visual processing.

Keywords:

Grouping by brightness Grouping by shape Grouping by size Perceptual grouping Response priming

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Area of Science:

Cognitive Psychology
Neuroscience
Visual Perception

Background:

Understanding perceptual grouping is crucial for visual processing.
Existing methods often lack objectivity or direct measurement of visuomotor efficiency.
Rapid processing of visual cues influences motor responses.

Purpose of the Study:

Introduce and validate the primed flanker task for measuring perceptual grouping.
Compare the efficiency of different grouping cues (brightness, shape, size) in rapid visuomotor processing.
Investigate the influence of subjective grouping strength on response times and priming effects.

Main Methods:

Developed a primed flanker task with varying stimulus-onset asynchronies (SOAs).
Manipulated grouping cues (brightness/shape, brightness/size) between primes and targets.
Measured response times, error rates, and priming effects as indicators of visual feedforward processing.

Main Results:

Stronger target grouping increased overall response times.
Stronger prime grouping enhanced priming effects in motor responses.
Discrepancies observed between rapid visuomotor processing and subjective impression for brightness/shape cues, but not brightness/size.

Conclusions:

The primed flanker task provides an objective measure of speeded visuomotor processing of grouping cues.
Different grouping cues exhibit varying efficiencies in feedforward visual processing.
The task is valuable for comparative studies of base groupings and their influence on visuomotor behavior.