Human reaching control in dynamic environments

Kalidindi, Hari T.; Crevecoeur, Frédéric

doi:10.1016/j.conb.2023.102810

Cited by 9 publications

(5 citation statements)

References 48 publications

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“…The great majority of studies on motor control have used experimental settings where relatively simple movements as key press or reaching to a peripheral target (Kalidindi and Crevecoeur, 2023) . Similar experimental settings have been employed for studying motor inhibition (Atsma et al, 2018; Brunamonti et al, 2012; Hannah and Aron, 2021; Mirabella et al, 2006).…”

Section: Discussionmentioning

confidence: 99%

Balancing postural control and motor inhibition during gait initiation

Fiori,

Ramawat,

Marc

et al. 2024

Preprint

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This study explores the link between cancelling a prepared gait initiation in response to sudden environmental changes and maintaining body stability. To address this, we developed a gait initiation version of the Stop Signal Task (SST), a widely used tool for evaluating motor inhibition during different forms of action control. To understand the relevance of postural control during gait initiation and suppression, we evaluated the underlying changes in anticipatory postural adjustments (APA). We report that specific trial-level variables, like the time to initiate or cancel stepping, interacted with biomechanical factors such as the center of mass displacement relative to the base of support, impacting performance. We identified a critical biomechanical threshold beyond which halting the movement became improbable. These findings underscore the tight connection between limb action control and overall body equilibrium, providing a framework within an established motor control paradigm. By incorporating biomechanical elements into this model, we demonstrate its efficacy for simulating complex real-life scenarios. This approach defines essential variables for studying neural correlations between action and postural control, guiding the development of tools for injury prevention and rehabilitation devices for individuals with movement and posture impairments, including those suffering of neurodegenerative disorders.

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Section: Discussionmentioning

confidence: 99%

Balancing postural control and motor inhibition during gait initiation

Fiori,

Ramawat,

Marc

et al. 2024

Preprint

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“…In dynamic environments, humans are able to rapidly integrate contextual information to generate motor corrections (Kalidindi & Crévécoeur, 2023). The onset and strength of express visuomotor responses following visual perturbations depend not only on visual target features, such as stimulus luminance, orientation, or spatial frequency (Kozak et al, 2019;Marino et al, 2012;Veerman et al, 2008), but also on the behavioural context, such as target shape, texture, colour, or contextual cues (Contemori et al, 2022;Cross et al, 2019;Dimitriou et al, 2013;Veerman et al, 2008).…”

Section: Rapid Visuomotor Responses Depend On Target Predictabilitymentioning

confidence: 99%

Rapid eye and hand responses in an interception task are differentially modulated by context-dependent predictability

Fooken,

Balalaie,

Park

et al. 2024

Preprint

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Humans can quickly generate eye and hand responses to unpredictable changes in the environment. Here, we investigated eye-hand coordination in a rapid interception task where human participants used a virtual paddle to intercept a moving target. The target moved vertically down a computer screen and could suddenly ‘jump’ to the left or right. In high-certainty blocks, the target always jumped, and in low-certainty blocks, the target only jumped in a portion of trials. Further, we manipulated response urgency by varying the time of target jumps, with early jumps requiring less urgent and late jumps requiring more urgent responses. Our results highlighted differential effects of certainty and urgency on eye-hand coordination. Participants initiated both eye and hand responses earlier for high-certainty compared to low-certainty blocks. Hand reaction times decreased and response vigor increased with increasing urgency levels. However, eye reaction times were lowest for medium-urgency levels and eye vigor was unaffected by urgency. Across all trials, we found a weak positive correlation between eye and hand responses. Taken together, these results suggest that the limb and oculomotor systems use similar early sensorimotor processing; however, rapid responses are modulated differentially to attain system-specific sensorimotor goals.

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“…The model considers a task dependent state-feedback controller derived in the framework of stochastic optimal control (28) . The controller was optimized to produce translation of a point mass on a horizontal plane.…”

Section: Simulations Of Sequence Executionmentioning

confidence: 99%

“…We assessed when the muscle stretch and shortening responses show dependency on the second target. If the two targets were simultaneously used to form an efficient feedback controller for the whole sequence, one would expect that the sensitivity of the response to the second target to become visible in the long-latency epoch, considering responses in this epoch as a proxy of flexible, state-feedback controller in the primate nervous system (28,38). Overall, the EMG responses indicated a significant influence of the second target on the long latency responses in both stretched and shortened muscles (Figure 4).…”

Section: Sequence-dependent Long-latency Feedback Responsesmentioning

confidence: 99%

“…As a consequence, the role of feedback control in this debate has been unexplored, although it is known that human motor control involves continuous processing of sensory feedback (23,24). The theory of optimal feedback control (OFC) has been particularly useful in predicting the influence of numerous task parameters on the controller (25)(26)(27)(28)(29)(30)(31)(32), thus reproducing goal-directed motor commands during both unperturbed movements and feedback responses to disturbances (28). In this framework, all targets in a sequence can be presented as simultaneous inputs to the controller, and the overlap between control gains applied to each target determines when they influence the sequence (Figure 1B).…”

Section: Introductionmentioning

confidence: 99%

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Task dependent coarticulation of movement sequences

Kalidindi,

Crevecoeur

2023

Preprint

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Classical theories propose that multiple goals of a sequence are specified simultaneously in the motor system, enabling each elements’ execution to be influenced by others in the sequence, a process known ascoarticulation. However, recent neural recordings suggest independent execution within circuits generating motor commands, with each individual goal separately specified to the controller. Consequently, the manner in which movement sequences are produced remains unclear. In a two-reaches sequence task, we tested the idea that both coarticulation and separation are related to flexible feedback control. More precisely, simulations revealed that an optimal feedback controller planning for multiple reaches at once can produce both separated and coarticulated sequences based on constraints imposed at intermediate goals. Human experiments confirmed that the coarticulation of sequential reaches was flexibly modulated by task instructions, matching simulation results closely. Moreover, the location of the second goal impacted long-latency muscle stretch responses to mechanical perturbations applied prior to the first goal, indicating that sequence combination was expressed in the sensorimotor network mediating fast feedback control. Overall, our results uncover the role of long-latency feedback pathway as a flexible control policy, supporting efficient sequence production without the need to individually specify each target one-by-one to the controller.SignificanceFrom preparing coffee to executing a tennis serve, our nervous system combines multiple elementary actions into longer sequences. Traditional research has explored whether these elements are combined in low-level control circuits for rapid execution or independently recalled from higher-level circuits. Surprisingly, the role of feedback control in the production of movement sequences has remained unexplored. Here, using simulations of optimal feedback control alongside human experiments, we shed light on the crucial role of task-dependent feedback control in shaping how sequences manifest within the motor system. Our findings reveal that the combination of sequence elements can result from flexible processing of multiple goals within the motor system involved in fast feedback control.

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Human reaching control in dynamic environments

Cited by 9 publications

References 48 publications

Balancing postural control and motor inhibition during gait initiation

Balancing postural control and motor inhibition during gait initiation

Rapid eye and hand responses in an interception task are differentially modulated by context-dependent predictability

Task dependent coarticulation of movement sequences

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