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Visual processing in rapid-chase systems: image processing, attention, and awareness.

Thomas Schmidt¹, Anke Haberkamp, G Marina Veltkamp

¹Faculty of Social Sciences, Psychology I, University of Kaiserslautern Kaiserslautern, Germany.

Frontiers in Psychology

|August 4, 2011

Summary

This summary is machine-generated.

Behavioral response priming reveals rapid feedforward processing in the visuomotor system. This fast processing, driven by initial visual signals, can occur even without conscious awareness and may differ from conscious perception.

Keywords:

feature-based attention lightness objects phobias rapid-chase response priming visual awareness visual perception

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Area of Science:

Cognitive Neuroscience
Visual Perception
Motor Control

Background:

Visual stimuli are processed rapidly, potentially within a single feedforward sweep through the visuomotor system.
Response priming tasks, using speeded responses to prime-target stimuli, offer behavioral criteria to evaluate feedforward processing.

Purpose of the Study:

To investigate feedforward processing using response priming across diverse complex visual stimuli.
To determine if feedforward processing is influenced by attention, perceptual learning, and illusions.
To explore the dissociation between rapid visuomotor responses and conscious visual awareness.

Main Methods:

Utilized response priming tasks with speeded pointing and keypress responses to classify natural images (animals/non-animals).
Examined priming effects under selective visual attention and with stimuli designed to create brightness illusions.
Assessed processing of phobic images in individuals with specific fears.

Main Results:

Pointing responses confirmed strict sequential processing, meeting rapid-chase criteria for feedforward processing.
Priming effects were enhanced by visual attention, even for unconsciously perceived stimuli.
Fearful individuals showed enhanced feedforward processing for phobic images, indicating perceptual learning.
Brightness illusions demonstrated a dissociation where motor responses contradicted subjective brightness judgments.

Conclusions:

Response priming reflects the output of the initial feedforward visual pass, lacking features of recurrent processing.
Visuomotor measures based on feedforward processing can diverge from conscious visual perception.
Fast, feedforward-driven visuomotor measures should complement slower, awareness-based psychophysical measures.