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. Author manuscript; available in PMC: 2018 May 1.
Published in final edited form as: Trends Cogn Sci. 2017 Mar 11;21(5):344–356. doi: 10.1016/j.tics.2017.02.001

Figure 2. Oculomotor paradigms used to study the role of CD signals in action.

Figure 2

a Double-step task. Two targets flash to cue a sequence of two saccades. An accurate second saccade requires accounting for the metrics of the first saccade; patients show incomplete compensation. b Anti-saccade task. After erroneous pro-saccades, CD of the first saccade might play a role in rapidly executing a corrective saccade. c Saccade adaptation. The saccade target is displaced during the saccade. Provided an intact CD signal, consistent landing errors across trials result in a reduction of the saccade amplitude for inward adaptation, and an increase for outward adaptation. In patients, adaptation can be weakened or slowed. d Predictive pursuit. While tracking a predictably moving target, intact CD in the pursuit system facilitates smooth tracking during periods of zero visual error (e.g., due to blanking or image stabilization).