Sklavos S, Porrill J, Kaneko CR, Dean P. Evidence for wide range of time scales in oculomotor plant dynamics: implications for models of eye-movement control.
Vision Res 2005;
45:1525-42. [PMID:
15781071 PMCID:
PMC1785298 DOI:
10.1016/j.visres.2005.01.005]
[Citation(s) in RCA: 38] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2004] [Revised: 01/04/2005] [Accepted: 01/06/2005] [Indexed: 11/17/2022]
Abstract
Oculomotor-plant dynamics are not well characterised, despite their importance for modelling eye-movement control. We analysed the time course of the globe's return after horizontal displacements in three rhesus monkeys lightly anaesthetised with ketamine. The eye-position traces were well fitted by a sum of four exponentials (time constants 0.012, 0.099, 0.46, 7.8 s). The two long time-constant terms accounted for 25% of plant compliance, and led to a model that accounted for hitherto unexplained features of ocular motoneuron firing such as (i) hysteresis, and (ii) the inability of a 2 time-constant model to fit data for both fast and slow eye-movements.
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