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Independence of Size and Distance in Binocular Vision.

Nam-Gyoon Kim¹

¹Department of Psychology, Keimyung University, Daegu, South Korea.

Frontiers in Psychology

|July 11, 2018

Summary

The size distance invariance hypothesis (SDIH) is challenged by new research. A novel binocular variable, independent of distance, better explains human size perception, particularly in stereoscopic vision.

Keywords:

binocular vision distance perception interpupillary distance size distance invariance hypothesis size perception

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Area of Science:

Visual Perception
Psychophysics
Computational Neuroscience

Background:

The size-distance invariance hypothesis (SDIH) has long dominated explanations of size perception.
SDIH's limitations include inconclusive evidence and challenges in accounting for binocular vision.
A lack of alternative models has contributed to SDIH's persistence.

Purpose of the Study:

To challenge the SDIH by proposing and testing a new binocular variable for size perception.
To investigate the independence of perceived size and distance in stereoscopic vision.
To provide evidence for an alternative model of size perception in the binocular visual system.

Main Methods:

Three experiments involving stereoscopic viewing of virtual objects.
Participants judged object size and distance.
Interpupillary distance (IPD) was manipulated in one experiment.

Main Results:

Perceived size judgments were more accurate and less biased than distance judgments.
Partial correlation analyses confirmed the independence of perceived size and distance.
Manipulating IPD affected size and distance judgments, aligning with the proposed binocular variable.

Conclusions:

Results provide strong evidence against the SDIH.
Kim's (2017) proposed binocular variable offers a viable alternative for explaining size perception.
The findings support the independence of perceived size and distance in binocular vision.