Responses to Noisy Periodic Stimuli Reveal Properties of a Neural Predictor
Open Access
- 1 October 2006
- journal article
- Published by American Physiological Society in Journal of Neurophysiology
- Vol. 96 (4), 2121-2126
- https://doi.org/10.1152/jn.00490.2006
Abstract
In programming motor acts, the brain must consider both internal and external noise sources: inherent variation in sensory estimates and changes within the environment. An interesting question in motor control is how reliable responses can be programmed in the face of noise and how these two noise sources interact. We study this by investigating the generation of sequences of predictive saccades to visual targets. First, eight normal subjects tracked targets that alternated at a pacing frequency (0.9 Hz) that promoted predictive behavior, for 300 trials. When tracking this perfectly periodic stimulus, there was variability in the timing of the saccades (intersaccade intervals) that was distributed around the interval of the stimulus (556 ms). We used this inherent variability to set the timing of subsequent stimuli; subjects completed three additional sessions in which the variance of the stimulus timing (the interstimulus intervals) had the same (1.0 SD), less (0.5 SD), or more (2.0 SD) variability than the subject displayed when tracking the perfectly periodic stimulus. Despite changes in stimulus timing variability, variance of the response timing (intersaccade intervals) was equal to the variance of the stimulus plus “inherent variance” (response variance when tracking a perfectly periodic stimulus). Examining the correlations between saccade latency and interstimulus interval, this relationship is interpreted as a tradeoff between reliance on previous saccade performance (intertrial correlations) and reliance on the current stimulus.Keywords
This publication has 23 references indexed in Scilit:
- Anticipatory Movement Timing Using Prediction and External CuesJournal of Neuroscience, 2006
- What makes us tick? Functional and neural mechanisms of interval timingNature Reviews Neuroscience, 2005
- A sensory source for motor variationNature, 2005
- Optimal Compensation for Changes in Task-Relevant Movement VariabilityJournal of Neuroscience, 2005
- Sequences of Predictive Saccades Are Correlated Over a Span of ∼2 s and Produce a Fractal Time SeriesJournal of Neurophysiology, 2005
- Functional Neuroanatomy of Anticipatory Behavior: Dissociation between Sensory-driven and Memory-driven SystemsCerebral Cortex, 2005
- Bayesian integration in sensorimotor learningNature, 2004
- Saccades Exhibit Abrupt Transition Between Reactive and Predictive, Predictive Saccade Sequences Have Long-Term CorrelationsJournal of Neurophysiology, 2003
- Book Review: How Do We Tell Time?The Neuroscientist, 2002
- Stimulus Probability and Simple Reaction TimeNature, 1967