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- Title
Context-specific adaptation of the gain of the oculomotor response to lateral translation using roll and pitch head tilts as contexts.
- Authors
Shelhamer, Mark; Peng, Grace C. Y.; Ramat, Stefano; Patel, Vivek
- Abstract
Previous studies established that vestibular and oculomotor behaviors can have two adapted states (e.g., gain) simultaneously, and that a context cue (e.g., vertical eye position) can switch between the two states. The present study examined this phenomenon of context-specific adaptation for the oculomotor response to interaural translation (which we term "linear vestibulo-ocular reflex" or LVOR even though it may have extravestibular components). Subjects sat upright on a linear sled and were translated at 0.7 Hz and 0.3 g peak acceleration while a visual-vestibular mismatch paradigm was used to adaptively increase (×2) or decrease (×0) the gain of the LVOR. In each experimental session, gain increase was asked for in one context, and gain decrease in another context. Testing in darkness with steps and sines before and after adaptation, in each context, assessed the extent to which the context itself could recall the gain state that was imposed in that context during adaptation. Two different contexts were used: head pitch (26° forward and backward) and head roll (26° or 45°, right and left). Head roll tilt worked well as a context cue: with the head rolled to the right the LVOR could be made to have a higher gain than with the head rolled to the left. Head pitch tilt was less effective as a context cue. This suggests that the more closely related a context cue is to the response being adapted, the more effective it is.
- Subjects
EYE movements; REFLEXES; PITCH (Rotational geometry); PHYSIOLOGICAL adaptation; CONTEXT effects (Psychology); HEAD
- Publication
Experimental Brain Research, 2002, Vol 146, Issue 3, p388
- ISSN
0014-4819
- Publication type
Article
- DOI
10.1007/s00221-002-1235-1