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[Practice effect and transfer in orientation discrimination reaction time].

Shinrigaku Kenkyu : the Japanese Journal of Psychology

|February 1, 1983

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This study investigated the oblique effect in visual perception. Practice significantly reduced this effect, suggesting cognitive factors, not just visual cortex function, influence orientation discrimination.

Area of Science:

Visual perception
Neuroscience
Cognitive psychology

Background:

The oblique effect is a well-documented phenomenon in visual perception.
It refers to the enhanced sensitivity to orientation-defined contours that are horizontal or vertical compared to oblique orientations.
The underlying neural mechanisms are not fully understood.

Purpose of the Study:

To investigate the influence of practice on the oblique effect.
To explore whether practice effects and transfer effects are attributable to visual cortex anisotropy or cognitive factors.

Main Methods:

Two experiments were conducted involving visual stimuli (horizontal-vertical and oblique).
Participants discriminated stimuli in peripheral and direct vision.
Experiment 1 involved repeated practice sessions (600 trials) in peripheral vision.

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Experiment 2 compared practiced subjects with naive control subjects in direct vision.

Main Results:

Subjects initially showed a marked oblique effect in peripheral vision, which decreased with practice.
The experimental group, after practice, showed a significantly reduced oblique effect compared to the control group.
Practice effects and transfer effects were observed.

Conclusions:

The observed practice and transfer effects suggest that the reduction in the oblique effect is not solely due to functional anisotropy of orientation analyzers in the visual cortex.
A cognitive approach is proposed to better explain these findings.
This highlights the role of learning and cognitive strategies in visual orientation perception.