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. 2013 Mar 19;7:4. doi: 10.3389/fnsys.2013.00004

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Copyright © 2013 Fukushima, Fukushima, Warabi and Barnes.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in other forums, provided the original authors and source are credited and subject to any copyright notices concerning any third-party graphics etc.

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Eye movements of a patient with Parkinson's disease and a normal control. (A1 and A2) Memory-based pursuit (A1) and simple ramp pursuit using a single spot (A2) of a Hoehn–Yahr stage III patient (73 years old). (B1 and B2) A normal control during memory-based pursuit (B1) and simple ramp pursuit (B2). In (A1 and B1) Go trials with rightward and leftward cue 1 motion were combined, since both subjects made no errors. Eye velocity (vel) during saccades was clipped. Bottom traces in (A1 and B1) are de-saccaded, averaged eye velocity for cue 1 rightward visual motion (blue) and cue 1 leftward (red) as indicated. Horizontal straight lines on eye velocity traces indicate zero velocity. ^*Indicates presence or absence of the initial pursuit component. See text for further explanation. Reproduced from Fukushima et al. (2011a,c).