Jean‐Jacques Orban de Xivry

Encoding of bimanual movement directions across the human sensorimotor system

The paper investigates how the brain encodes bimanual movement directions using fMRI, finding distinct neural representations for unimanual and bimanual movements.

Age-related difference in gray matter volumes is heterogeneous across cerebellar regions but neither related to the topological organization nor the associated sensorimotor function

The paper examines age-related changes in cerebellar gray matter volume across different regions and finds heterogeneous decline with no significant relationship to topological organization or sensorimotor function.

No effect of anodal high-definition transcranial direct current stimulation during motor sequence learning in older people

This study investigates the effect of conventional and high-definition tDCS on motor sequence learning in older adults, finding no significant enhancement in learning or retention.

Mistakes matter, age doesn't: task outcome modulates implicit motor adaptation similarly in young and older adults

The paper investigates whether implicit motor adaptation in young and older adults is similarly modulated by task outcomes, finding no consistent age effect in the motor domain but effects in the cognitive domain.

Preserved cerebellar functions despite structural degeneration in older adults

This study shows that cerebellar motor functions remain preserved in older adults despite structural degeneration, while non-cerebellar sensorimotor functions decline with age.

Cerebellar function remains resilient under increased task demands in healthy adults up to 80 years but it is task-specific and independent of cerebellar structure

The paper examines cerebellar resilience to task demands in healthy adults across age groups, finding task-specific resilience in motor functions but not in cognitive functions or general sensorimotor performance.

Age-related changes in proprioception are of limited size, outcome-dependent and task-dependent.

This study assesses age-related changes in upper limb proprioception across multiple tasks and finds that effects are variable, task-dependent, and often require large samples to detect.

Modeling Human Visuomotor Adaptation with a DisturbanceObserver Framework

This paper proposes a disturbance observer framework to model visuomotor adaptation by integrating internal model principles and feedforward learning systems.

Adults up to 80 years old maintain effective movement planning when facing complex body dynamics

The paper investigates age-related changes in motor control during multi-joint movements, finding preserved feedforward control but deteriorated feedback control in older adults.

A paradigm to study the learning of muscle activity patterns outside of the natural repertoire

This paper introduces a new paradigm to study muscle activity pattern learning, finding that difficulty is linked to muscle activity similarity to everyday use and activity size.

String-pulling by the common marmoset

This study examines how adult common marmosets perform a string-pulling task and how their performance changes across the lifespan.

Not fleeting but lasting: Limited influence of aging on implicit adaptative motor learning and its short-term retention.

This study replicates and refutes previous findings that older adults show reduced implicit motor learning and spontaneous recovery, showing no age-related differences in these processes.

A control policy can be adapted to task demands during both motor execution and motor planning

This study investigates whether adjusting control policies to task demands occurs during motor planning or execution and finds that it can happen during both phases.

The differential effect of age on upper limb sensory processing, proprioception and motor function

This study examines age-related changes in upper limb sensory processing, proprioception, and motor function, finding greater age effects on sensory processing than on motor or proprioceptive abilities.

Aging exerts a limited influence on the perception of self-generated and externally generated touch

The paper investigates whether aging increases somatosensory attenuation and finds no significant increase in elderly participants, challenging previous claims of a direct relationship.

Age-related balance difficulties during shoulder checks increase cycling risk in older adults

This study finds older adults make more errors and show greater balance variability during shoulder checks while cycling, contributing to higher single-sided bike accident risk.

Increased upper-limb sensory attenuation with age

This study shows older adults exhibit greater sensory attenuation during force production on the arm, challenging the assumption that this is due to impaired somatosensation.

Does somatosensory acuity influence the extent of internal model recalibration in young and older adults?

This study investigates whether age-related declines in somatosensory acuity are linked to increased internal model recalibration during motor adaptation, but finds no support for this hypothesis.

Motor resonance is modulated by an object's weight distribution

The paper investigates whether motor resonance is modulated by an object's weight distribution and finds that it is, during both observation and planning of lifting actions.

A Synthesis of the Many Errors and Learning Processes of Visuomotor Adaptation

Synthesizing visuomotor adaptation literature, this review maps three distinct error signals—task performance, sensory prediction, and binary target hitting errors—onto interacting implicit and explicit learning processes.

Lift observation conveys object weight distribution but partly enhances predictive lift planning

The paper shows that observing lifts of objects conveys weight distribution information, improving digit positioning strategies, but only error observations enhance predictive motor control for unexpected weight distributions.

Why is the explicit component of motor adaptation limited in elderly adults?

The study investigates why older adults show limited explicit motor adaptation, finding that visuospatial working memory capacity, not cognitive resource allocation, correlates with adaptation levels.

Sensorimotor expectations bias motor resonance during observation of object lifting: The causal role of pSTS

This paper investigates how weight expectations during object lifting observation modulate motor resonance, showing that pSTS suppression of motor resonance is critical for weight-based corticospinal excitability.

Internal model recalibration does not deteriorate with age while motor adaptation does.

The paper investigates age-related deficits in motor adaptation and finds that cognitive components are reduced in older adults, while internal model recalibration remains intact.

Visual and auditory information shed light on savings mechanisms

The paper investigates how visual and auditory feedback influence motor learning and adaptation, finding that visual feedback leads to higher adaptation than auditory feedback, with transfer occurring through a memory of the learned reaching direction.

Weighted integration of short term memory and sensory signals in the oculomotor system

The paper demonstrates that smooth pursuit eye velocity and catch-up saccade amplitude are modulated by the reliability of visual and prior information in a smooth pursuit task.

Overlap of movement planning and movement execution reduces reaction time by up to 100ms.

The paper shows that overlapping movement planning and execution reduces reaction time by up to 100ms in a virtual line bisection task.