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Related Experiment Video

Updated: Apr 8, 2026

A View of Their Own: Capturing the Egocentric View of Infants and Toddlers with Head-Mounted Cameras
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The oblique effect is both allocentric and egocentric.

Kyriaki Mikellidou, Guido Marco Cicchini, Peter G Thompson

    Journal of Vision
    |July 2, 2015
    PubMed
    Summary

    The oblique effect, a visual perception phenomenon, shifts between egocentric and allocentric coordinates based on body and head position. This suggests a compulsory fusion model integrating head and gravity signals for visual stability.

    Area of Science:

    • Visual perception
    • Neuroscience
    • Human orientation

    Background:

    • Humans maintain a stable visual world despite head movements.
    • Mechanisms of visual stability, especially concerning head tilt, are not fully understood.
    • The oblique effect, superior performance for cardinal vs. oblique orientations, is a known visual phenomenon.

    Purpose of the Study:

    • To investigate if the oblique effect is anchored in egocentric or allocentric coordinates.
    • To understand how head tilt influences visual perception and the oblique effect.
    • To explore the underlying mechanisms of visual stability during head movements.

    Main Methods:

    • Measured orientation discrimination thresholds at various stimulus orientations.
    • Tested participants in both body upright and supine positions.

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  • Manipulated head position to assess its impact on the oblique effect.

    • Main Results:

    • In the body upright position, the oblique effect remained anchored in allocentric coordinates regardless of head position.
    • When supine, the oblique effect was less pronounced and anchored in egocentric coordinates, discounting gravitational effects.
    • A compulsory fusion model with 30% head-based and 70% gravity-based signal weighting explained the results.

    Conclusions:

    • The oblique effect's reference frame (egocentric vs. allocentric) depends on body position and gravitational influence.
    • Visual stability appears to be maintained through a weighted combination of head-based and gravity-based orientation signals.
    • This integration process, while ensuring stability, can sometimes reduce orientation discrimination sensitivity.