ArticleExperimental brain research2026
Effect of prism adaptation and virtual-tilted environment on straight-ahead and verticality perception in healthy individuals: evidence for dissociated 2D spatial coordinate systems.
Article in Experimental brain research, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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5 authors.
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Abstract
The ego-centred straight-ahead (SA) and gravity-centred visual vertical (VV) constitute important reference frames for perception and action. Clinical studies have shown a strong association between SA and VV representational biases following right hemispheric stroke, suggesting that the brain builds 3D representations referenced to the body in the horizontal plane and to gravity in the frontal plane. Here, we tackled this hypothesis in 37 right-handed healthy individuals (median age 20 years; 23 [62%] females) by testing whether prism adaptation (PA) and immersion in a tilted virtual environment (VTE) could bias both SA and VV orientations in a congruent, co-dependent manner. Each participant underwent a session of right or left PA (optic shift: ± 10°) and VTE (tilt: ± 18°). Pre- and post-test SA and VV orientations were measured in darkness by asking participants to point straight-ahead and to adjust a luminous line to the vertical, respectively. VV was also measured during VTE immersion. For PA, the expected post-effect on SA orientation (changes≈3.5°; ANOVA, p < 10
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