Abstract This study investigated the effects of different types neurological deficits on timing functions. The performance Parkinson, cerebellar, cortical, and peripheral neuropathy patients was compared to age-matched control subjects two separate measures first task involved production timed intervals in which attempted maintain a simple rhythm. second measured subjects' perceptual ability discriminate between small differences duration intervals. primacy cerebellum functions demonstrated...

Visuomotor adaptation has been thought to be an implicit process that results when a sensory-prediction error signal is used update forward model. A striking feature of human competence the ability receive verbal instructions and employ strategies solve tasks; such explicit processes could during visuomotor adaptation. Here, we novel task design allowed us obtain continuous reports aiming direction while participants learned rotation. We had two main hypotheses: contribution learning would...

The brain localization of motor sequence learning was studied in normal subjects with positron emission tomography. Subjects performed a serial reaction time (SRT) task by responding to series stimuli that occurred at four different spatial positions. stimulus locations were either determined randomly or according 6-element cycled continuously. SRT under two conditions. With attentional interference from secondary counting there no development awareness the sequence. Learning-related...

The authors theorize that 2 neurocognitive sequence-learning systems can be distinguished in serial reaction time experiments, one dorsal (parietal and supplementary motor cortex) the other ventral (temporal lateral prefrontal cortex). Dorsal system learning is implicit associates noncategorized stimuli within dimensional modules. Ventral or explicit It also allows associating events across dimensions therefore basis of cross-task integration interference, depending on degree correlation...

Patients with cerebellar damage are known to exhibit deficits in the temporal control of movements. We report that these restricted discontinuous Cerebellar patients exhibited no deficit variability when producing continuous, rhythmic hypothesize properties continuous movements emergent and reflect operation other parameters not associated cerebellum. In contrast, require an explicit representation goal, a function The requirement for provides parsimonious account involvement range tasks.

Functional imaging studies have revealed recruitment of ipsilateral motor areas during the production sequential unimanual finger movements. This phenomenon is more prominent in left hemisphere left-hand movements than right right-hand Here we investigate whether this lateralization pattern related specifically to structure action or generalizes other complex Using event-related fMRI, measured activation changes cortex three types movements: repetitions a sequence with multiple fingers,...

The question of whether language affects perception has been debated largely on the basis cross-language data, without considering functional organization brain. nature this neural predicts that, if perception, it should do so more in right visual field than left field, an idea unexamined debate. Here, we find support for proposal lateralized color discrimination tasks. Reaction times to targets were faster when target and distractor colors had different names; contrast, reaction not...

Study participants performed time perception and production tasks over a set of 4 intervals ranging from 325 to 550 ms. In 3 experiments, variability on both the was found be linearly related square target intervals. If short temporal use common timing mechanism, slopes functions for 2 should identical. The results Experiment 1 failed support this prediction. However, when were made more similar by providing single (Experiment 2) or multiple 3) presentations interval per judgment production,...

The cerebellum is often active in imaging studies of verbal working memory, consistent with a putative role articulatory rehearsal. While patients cerebellar damage occasionally exhibit mild impairment on standard neuropsychological tests these are not diagnostic for exploring processes detail. current study was designed to determine whether the associated impairments range memory tasks, and if so, under what circumstances. Moreover, we assessed hypothesis that related impaired rehearsal...

Visuomotor rotation tasks have proven to be a powerful tool study adaptation of the motor system. While in such is seemingly automatic and incremental, participants may gain knowledge perturbation invoke compensatory strategy. When provided with an explicit strategy counteract rotation, are initially very accurate, even without on-line feedback. Surprisingly, further testing, angle their reaching movements drifts direction strategy, producing increase endpoint errors. This drift attributed...

Sensorimotor adaptation occurs when there is a discrepancy between the expected and actual sensory consequences of movement. This learning can be precisely measured, but its source has been hard to pin down because standard tasks introduce two potential signals: task performance errors prediction errors. Here we employed new method that induces without combines use clamped visual feedback angularly offset from target independent direction motion, along with instructions ignore this while...