On the relation between ocular torsion and visual perception of line orientation.
A recent study by Poljac et al. [Poljac, E., Lankheet, M. J. M., & van den Berg, A. (2005). Perceptual compensation for eye torsion. Vision Research, 45(4), 485-496] concluded that there was complete perceptual compensation for ocular torsion, although they did not directly measure ocular torsion. Using a similar eccentric-gaze paradigm to induce changes in torsion, which were directly measured, we found inconsistent torsional eye movements at eccentric fixation, and also failed to detect a significant relationship between ocular torsion and the perception of line orientation. We then used a stimulus known to induce large changes in ocular torsion: on-centre yaw rotation. This stimulus induced a consistent change in the torsional position of the eye which positively correlated to subjects' visual perception of horizontal.
Goonetilleke
Samanthi C
SC
Vestibular Research Laboratory, School of Psychology, A18, The University of Sydney, NSW 2006, Australia.
Mezey
Laura E
LE
Burgess
Ann M
AM
Curthoys
Ian S
IS
D000328:Adult; D005133:Eye Movements / Q000502:physiology*; D005403:Fixation, Ocular / Q000502:physiology; D006801:Humans; D008875:Middle Aged; D009949:Orientation; D010775:Photic Stimulation / Q000379:methods; D012027:Reflex, Vestibulo-Ocular / Q000502:physiology; D012399:Rotation; D014796:Visual Perception / Q000502:physiology*