Planning short pointing sequences

Vindras, Philippe; Viviani, Paolo

doi:10.1007/s00221-004-1995-x

Cited by 21 publications

(13 citation statements)

References 52 publications

(62 reference statements)

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“…In the go-only trials the absence of a brake allows a shortening of RTs at the cost of leaving some details of the motor program uncompleted, so that the planning must be completed during the movement. Data collected both on healthy subjects [11], [13], [34], [35] and on PD patients [12] support the idea that an action plan can be updated beyond the initiation phase.…”

Section: Discussionmentioning

confidence: 69%

Stimulation of Subthalamic Nuclei Restores a Near Normal Planning Strategy in Parkinson’s Patients

et al. 2013

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A fundamental function of the motor system is to gather key information from the environment in order to implement behavioral strategies appropriate to the context. Although several lines of evidence indicate that Parkinson’s disease affects the ability to modify behavior according to task requirements, it is currently unknown whether deep brain stimulation (DBS) of the subthalamic nucleus (STN) affects context-related planning. To explore this issue, we asked 12 Parkinson’s patients with bilateral STN DBS and 13 healthy subjects to execute similar arm reaching movements in two different paradigms: go-only and countermanding tasks. In the former task patients had to perform speeded reaching movements to a peripheral target. In contrast, in the countermanding task participants had to perform the same reaches unless an infrequent and unpredictable stop-signal was shown during the reaction time (RT) indicating that they should withhold the ongoing action. We compared the performance of Parkinson’s patients in different DBS conditions. We found that patients with both DBS-ON behaved similarly to healthy subjects, in that RTs of no-stop trial increased while movement times (MTs) decreased with respect to those of go-only-trials. However, when both DBS were off, both RTs and MTs were longer in no-stop trials than in go-only trials. These findings indicate that bilateral DBS of STN can partially restore the appropriate motor strategy according to the given cognitive contexts.

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Section: Discussionmentioning

confidence: 69%

Stimulation of Subthalamic Nuclei Restores a Near Normal Planning Strategy in Parkinson’s Patients

et al. 2013

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“…It has been shown that both reaction time (RT; e.g., Henry & Rogers, 1960;Riehle & Requin, 1995;Rosenbaum, 1980) and movement time (MT; e.g., Adam et al, 2000;Glencross, 1980;Vindras & Viviani, 2005) can be influenced by the experimental context.…”

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confidence: 99%

Context influences on the preparation and execution of reaching movements

Mirabella

Pani

Ferraina

2008

Cognitive Neuropsychology

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The ability of rapidly adapting our motor behaviour in order to face the unpredictable changes in the surrounding environment is fundamental for survival. To achieve such a high level of efficiency our motor system has to assess continuously the context in which it acts, gathering all available information that can be relevant for planning goal-oriented movements. One still-debated aspect of movement organization is the nature and timing of motor planning. While motor plans are often taken to be concerned with the setting of kinematic parameters as a function of perceptual and motor factors, it has been suggested that higher level, cognitive factors may also affect planning. To explore this issue further, we asked 18 right-handed human participants to perform speeded hand-reaching movement toward a visual target in two different experimental settings, a reaction time (RT) paradigm (go-only task) and a countermanding paradigm. In both tasks participants executed the same movements, but in the countermanding task no-stop trials were randomly intermixed with stop trials. In stop trials participants were required to withhold the ongoing movement whenever a stop signal was shown. It is known that the presence of stop trials induces a consistent increase of the RTs of no-stop trials with respect to the RTs of go-only trials. However, nothing is known about a similar effect for movement times (MTs). We found that RTs and MTs exhibit opposing tendencies, so that a decrease in the RT correspond to an increase in the MT and vice versa. This tendency was present in all our participants and significant in 90% of them. Furthermore we found a moderate, but again very consistent, anticorrelation between RTs and MTs on a trial-by-trial base. These findings are consistent with strategic changes in movement programmes for the very same movements under different cognitive contexts, requiring different degrees of feedback-driven control during movement.

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“…While searching for the first member of the pair, the location of the second item is either explicitly or implicitly coded, leading to more rapid second response. This phenomenon may also be related to parallel programming of action sequences, which is known to occur for both reaching movements ( Adam et al., 2000 ; Lavrysen et al., 2002 ; Vindras & Viviani, 2005 ) and saccades ( McPeek et al., 2000 ; McSorley et al., 2019 ; Walker & McSorley, 2006 ).…”

Section: Discussionmentioning

confidence: 99%

Searching Through Alternating Sequences: Working Memory and Inhibitory Tagging Mechanisms Revealed Using the MILO Task

Thornton

Horowitz

2020

i-Perception

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We used the Multi-Item Localisation (MILO) task to examine search through two sequences. In Sequential blocks of trials, six letters and six digits were touched in order. In Mixed blocks, participants alternated between letters and digits. These conditions mimic the A and B variants of the Trail Making Test (TMT). In both block types, targets either vanished or remained visible after being touched. There were two key findings. First, in Mixed blocks, reaction times exhibited a saw-tooth pattern, suggesting search for successive pairs of targets. Second, reaction time patterns for vanish and remain conditions were identical in Sequential blocks—indicating that participants could ignore past targets—but diverged in Mixed blocks. This suggests a breakdown of inhibitory tagging. These findings may help explain the elevated completion times observed in TMT-B, relative to TMT-A.

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Planning short pointing sequences

Cited by 21 publications

References 52 publications

Stimulation of Subthalamic Nuclei Restores a Near Normal Planning Strategy in Parkinson’s Patients

Stimulation of Subthalamic Nuclei Restores a Near Normal Planning Strategy in Parkinson’s Patients

Context influences on the preparation and execution of reaching movements

Searching Through Alternating Sequences: Working Memory and Inhibitory Tagging Mechanisms Revealed Using the MILO Task

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