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Related Experiment Video

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Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior

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Published on: April 16, 2014

Individual differences in perceived elevation and verticality: evidence of a common visual process.

Adam Y Shavit¹, Wenxun Li, Leonard Matin

¹John B. Pierce Laboratory, Yale University, New Haven, CT, USA. shavitadam@hotmail.com

Multisensory Research

|August 23, 2013

Summary

Visual perception of eye level (VPEL) and visually perceived vertical (VPV) rely on a shared visual orientation process. This process integrates visual cues with body-referenced signals, influencing perception despite different integration rules.

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Area of Science:

Visual perception
Human psychophysics
Neuroscience

Background:

Visual perception of eye level (VPEL) and visually perceived vertical (VPV) are influenced by line orientation.
These two norms, while distinct in their integration rules, may share underlying processing mechanisms.

Purpose of the Study:

To investigate whether a single orientation-sensitive visual process underlies both VPEL and VPV.
To model the influence of visual orientation on VPEL and VPV using a combination of visual and non-visual sensory inputs.

Main Methods:

Participants (n=30) performed VPEL and VPV tasks using 1-line and 2-line stimuli with varying orientations.
Settings for VPEL and VPV were modeled as linear averages of visual and non-visual (vestibular, proprioceptive) signals.

Main Results:

Line orientation significantly affected both VPEL and VPV settings.
Strong correlations were found between observers in the effects of visual orientation on both norms.
Correlations were also observed in baseline measures (dark value, intercept), suggesting shared egocentric biases.

Conclusions:

A single, shared visual orientation process likely underlies both VPEL and VPV.
This shared visual process feeds into separate integration mechanisms for each norm.
Individual co-variation patterns support a unified visual orientation mechanism despite differing integration rules.