Luc Tremblay

Luc Tremblay
University of Toronto | U of T · Faculty of Kinesiology and Physical Education

Ph.D.

About

132
Publications
16,660
Reads
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1,193
Citations
Additional affiliations
December 2012 - present
University of Toronto
Position
  • Professor (Associate)
July 2003 - present
University of Toronto
Position
  • Professor (Associate)
October 2002 - June 2003
University of Houston
Position
  • Professor (Assistant)

Publications

Publications (132)
Article
Full-text available
ABSTRACT Recently, D. Elliott et al. (2010) asserted that the current control phase of a movement could be segregated in multiple processes, including impulse and limb-target regulation processes. The authors aimed to provide further empirical evidence and determine some of the constraints that govern these visuomotor processes. In 2 experiments, v...
Article
Full-text available
The efficiency of online visuomotor processes was investigated by manipulating vision based on real-time upper limb velocity. Participants completed rapid reaches under two control (full vision, no vision) and three experimental visual window conditions. The experimental visual windows were early: 0.8-1.4 m/s, middle: above 1.4 m/s, and late: 1.4 t...
Chapter
Full-text available
Performing voluntary actions often requires using more than one sensory modality. However, different modalities provide information in different domains. For example, vision primarily gathers information in the positional domain while the inner ear primarily encodes information in the acceleration domain. This chapter presents neurophysiological an...
Article
Full-text available
The utilization of sensory information during activities of daily living is ubiquitous both prior to and during movements (i.e., related to planning and online control, respectively). Because of the overlapping nature of online corrective processes, the quantification of feedback utilization has proven difficult. In the present study, we primarily...
Article
Full-text available
Movement corrections to somatosensory targets have been found to be shorter in latency and larger in magnitude than corrections to external visual targets. Somatosensory targets (e.g., body positions) can be identified using both tactile (i.e., skin receptors) and proprioceptive information (e.g., the sense of body position derived from sensory org...
Article
Full-text available
Our perception of sensory events can be altered by action, but less is known about how our perception can be altered by action observation. For example, our ability to detect tactile stimuli is reduced when our limb is moving, and task-relevance and movement speed can alter such tactile detectability. During action observation, however, the relatio...
Article
Full-text available
The feasibility of prediction of same-limb kinematics using a single inertial measurement unit attached to the same limb has been demonstrated using machine learning. This study was performed to see if a single inertial measurement unit attached to the tibia can predict the opposite leg’s kinematics (cross-leg prediction). It also investigated if t...
Article
Manual handling training may be improved if it relied on the provision of individualized, augmented feedback about key movement features. The purpose of this study was to compare the reduction in sagittal spine motion during manual lifting tasks following two training approaches: didactic (DID) and augmented feedback (AUG). Untrained participants (...
Article
Full-text available
Brief windows of vision presented during reaching movements contribute to endpoint error estimates. It is not clear whether such error detection processes depend on other sources of information (e.g., proprioception and efference). In the current study, participants were presented with a brief window of vision and then judged whether their movement...
Article
Research Objectives To use a novel limb acceleration measure to reveal mechanisms of improved paretic limb control following music-based rehabilitation. Design A consecutive sample. Setting A music and health research facility in Toronto, CA. Participants 30 community dwellers aged 30-79 years in the chronic stroke phase with minimal volitional...
Article
Full-text available
Objective To investigate the potential benefits of three Therapeutic Instrumental Music Performance (TIMP)-based interventions in rehabilitation of the affected upper-extremity [UE] for adults with chronic post-stroke hemiparesis. Design Randomized-controlled pilot study Setting University research facility Participants Thirty community-dwelling...
Article
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Wearable sensors facilitate running kinematics analysis of joint kinematics in real running environments. The use of a few sensors or, ideally, a single inertial measurement unit (IMU) is preferable for accurate gait analysis. This study aimed to use a convolutional neural network (CNN) to predict level-ground running kinematics (measured by four I...
Poster
Full-text available
The auditory and motor systems have rich connectivity during movement to the predictable auditory rhythmic stimuli, promoting the synchronization of the two systems through a process called rhythmic entrainment (Thaut, 2003). Auditory-motor entrainment occurs when the frequency of external rhythmic auditory cues determines the frequency of activity...
Article
While younger and older adults can perform upper-limb reaches to spatial targets with comparable endpoint accuracy (i.e., Helsen et al., 2016; Goodman et al., 2020), movement planning (i.e., reaction time) is significantly longer in older versus younger adults (e.g., Pohl et al., 1996; Goodman et al., 2020). Critically relevant to the current study...
Article
Background: The burden of post-stroke cognitive impairment, as well as affective disorders, remains persistently high. With improved stroke survival rates and increasing life expectancy, there is a need for effective interventions to facilitate remediation of neurocognitive impairments and post-stroke mood disorders. Objective: To investigate th...
Article
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A remote visual distractor increases saccade reaction time (RT) to a visual target and may reflect the time required to resolve conflict between target-and distractor-related information within a common retinotopic representation in the superior col-liculus (SC) (i.e., the remote distractor effect: RDE). Notably, because the SC serves as a sensorim...
Article
Rapid motor learning may occur in situations where individuals perceive a threat if they do not perform a task well. This rapid motor learning may be facilitated by improved motor performance and, consequently, more errorless practice. As a first step towards understanding the role of perceived threat on rapid motor learning, the purpose of this st...
Article
Full-text available
Pairing high-intensity interval training (HIIT) with motor skill acquisition may improve learning of some implicit motor sequences (albeit with some variability), but it is unclear if HIIT enhances explicit learning of motor sequences. We asked whether a single bout of HIIT after non-musicians learned to play a piano melody promoted better retentio...
Article
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It has been argued that exercise-induced muscle fatigue and tendon vibration can alter unisensory proprioceptive estimates of limb position. While exercise-induced muscle fatigue may also affect central efferent processes related to limb position sense, tendon vibration specifically targets peripheral afferent signals. It is unclear, however, wheth...
Article
The current study examined how the deployment of spatial attention at the onset of a pointing movement influenced audiovisual crossmodal interactions at the target of the pointing action and at nontarget locations. These interactions were quantified by measuring the susceptibility to the fission (i.e., reporting two visual flashes under one flash a...
Article
Full-text available
Many researchers have proposed that when an individual observes the actions of another individual, the observer simulates the action using many of the same neural areas that are involved in action production. The present study was designed to test this simulation hypothesis by comparing the perception of multisensory stimuli during both the executi...
Article
Full-text available
Background: Older and younger adults utilize sensory information differently to plan and control their reaching movements to visual targets. In addition, younger adults appear to utilize different sensorimotor transformations when reaching to somatosensory vs. visual targets. Critically, it is not yet known if older adults perform similar sensorimo...
Article
Full-text available
Robotic guidance has been employed with limited effectiveness in neurologically intact and patient populations. For example, our lab has effectively used robotic guidance to acutely improve movement smoothness of a discrete trajectory without influencing movement endpoint distributions. The purpose of the current study was to investigate the effica...
Article
Reaches with overlapping stimulus-response spatial relations (propointing) adhere to speed–accuracy relations as defined by Paul Fitts’ index of difficulty equation (ID Fitts : in bits of information). This movement principle is attributed to response mediation via the “fast” visuomotor networks of the dorsal visual pathway. It is, however, unclear...
Poster
Full-text available
Mindfulness meditation has been shown to have a positive effect on perception and subsequent motor-performance (e.g., Naranjo, 2012). Additionally, there is emerging research to suggest that neurofeedback (i.e., real-time audio feedback via EEG) during mindfulness meditation may boost executive function in cognitive tasks (e.g., Balgemann, 2015). H...
Preprint
Full-text available
Robotic guidance has been employed with limited effectiveness in neurologically intact and patient populations. For example, our lab has effectively used robotic guidance to acutely improve movement smoothness of a discrete trajectory without influencing movement endpoint distributions (Manson et al., 2014). The purpose of the current study was to...
Preprint
Full-text available
Rapid motor learning may occur in situations where individuals perceive a threat of injury if they do not perform a task well. This rapid motor learning may be facilitated by improved motor performance and, consequently, more errorless practice. As a first step towards understanding the role of perceived threat on rapid motor learning, the purpose...
Article
Full-text available
New technologies have expanded the available methods to help individuals learn or re-learn motor skills. Despite equivocal evidence for the impact of robotic guidance for motor skill acquisition (Marchal-Crespo, McHughen, Cramer, & Reinkensmeyer, 2010), we have recently shown that robotic guidance mixed with unassisted practice can significantly im...
Article
Full-text available
A limb’s initial position is often biased to the right of the midline during activities of daily living. Given this specific initial limb position, visual cues of the limb become first available to the ipsilateral eye relative to the contralateral eye. The current study investigated online control of the dominant limb as a function of having visual...
Article
Full-text available
Prior to goal-directed actions, somatosensory target positions can be localized using either an exteroceptive or an interoceptive body representation. The goal of the present study was to investigate if the body representation selected to plan reaches to somatosensory targets is influenced by the sensory modality of the cue indicating the target’s...
Article
Full-text available
When performing upper limb reaches, the sensorimotor system can adjust to changes in target location even if the reaching limb is not visible. To accomplish this task, sensory information about the new target location and the current position of the unseen limb are used to program online corrections. Previous researchers have argued that, prior to...
Article
The control of ongoing goal-directed reaches is influenced by both visual and nonvisual sensorimotor processes. Notably, intentions to produce accurate movements also influence reaching performance. However, it is not known whether these improvements associated with accuracy-based intentions can be attributed to changes in movement planning and/or...
Article
Full-text available
When performing upper limb reaches, the sensorimotor system can adjust to changes in target location even if the reaching limb is not visible. To accomplish this task, sensory information about the new target location and the current position of the unseen limb are used to program online corrections. Previous researchers have argued that, prior to...
Article
Full-text available
Elliott et al. (Hum Mov Sci 10:393–418, 1991) proposed a pseudocontinuous model of online control whereby overlapping corrections lead to the appearance of smooth kinematic profiles in the presence of online feedback. More recently, it was also proposed that online control is not a singular process [see Elliott et al. (Psychol Bull 136(6):1023–1044...
Poster
Full-text available
Although robotic guidance has yielded limited effectiveness in improving motor functions in neurologically intact and patient populations (e.g., Krishnan et al., 2012; Kummel et al., 2014), it has typically employed constant practice. Employing variability of practice principles, our lab has previously employed robotic guidance to acutely improve m...
Poster
Full-text available
Attention can be directed towards the environment or the body. According to Wulf and Prinz (2001), directing attention towards the environment is beneficial for performance because it allows the motor system to perform without the interference from conscious processes related to limb and body information. However, it is not known if instructing to...
Article
The purpose of the present study was to assess the degree to which children and adolescents represent and match the observed body parts of others onto the internal representation of their own body parts. Male and female participants of different age groups (7–9, 10–12, and 13–16 years old) completed a body-part compatibility task in which they resp...
Article
Full-text available
Visual feedback is crucial for movement accuracy (e.g., Keele and Posner, J Exp Psychol 77:155-158, 1968). As well, proprioception has been argued to be important for the control of voluntary movements (e.g., Bagesteiro et al., Exp Brain Res 171:358-370, 2006; Rossetti et al., J Neurophysiol 74:457-463, 1995). While tendon vibration (TVib) has been...
Article
Full-text available
When moving our upper-limb towards a single target, movement times are typically shorter than when movement to a second target is required. This is known as the one-target advantage. Most studies that have demonstrated the one-target advantage have employed separate trial blocks for the one- and two-segment movements. To test if the presence of the...
Article
Full-text available
A major challenge to the measurement of online control is the contamination by offline, planning-based processes. The current study examined the sensitivity of four measures of online control to offline changes in reaching performance induced by prism adaptation and terminal feedback. These measures included the squared Z scores (Z2) of correlation...
Article
Full-text available
In order to maximize the precise completion of voluntary actions, humans can theoretically utilize both visual and proprioceptive information to plan and amend ongoing limb trajectories. Although vision has been thought to be a more dominant sensory modality, research has shown that sensory feedback may be processed as a function of its relevance a...
Article
Full-text available
Susceptibility to audiovisual illusions is altered during rapid upper-limb reaching movements. Although this change in perception appears to be linked to the movement’s real-time characteristics, the mechanism for this alteration remains unknown. In the present study, we examined whether this modulation of multisensory perception could be explained...
Article
Full-text available
Movement times are significantly shorter when moving from a start position to a single target, compared to when one has to continue onto a second target (i.e., the one-target advantage [OTA]). To explain this movement time difference, both the movement integration and the movement constraint hypotheses have been proposed. Although both hypotheses h...
Conference Paper
Full-text available
Performing rapid upper-limb movements influence audiovisual integration (i.e., Loria et al., 2016a). The re-weighting of target-congruent sensory information, such as the real-time up-regulation of visual processing during visuomotor tasks, may explain the influence of action on audiovisual processing (e.g., Tremblay & Nguyen, 2010). Yet, presentin...
Poster
Full-text available
Accurate reaching movements can theoretically benefit from multisensory feedback. Both vision and proprioception should be useful when performing early online limb trajectory amendments (i.e., impulse regulation; see Elliott et al., 2010). However, the notion of impulse regulation was developed with limb trajectory perturbations (i.e., altered move...
Article
Full-text available
The authors investigated how visual information from the nondominant and dominant eyes are utilized to control ongoing dominant hand movements. Across 2 experiments, participants performed upper-limb pointing movements to a stationary target or an imperceptibly shifted target under monocular-dominant, monocular-nondominant, and binocular viewing co...
Article
The commentary by Errol Hoffmann asserts that previous work by our group provides the spurious conclusion that amplitude and width manipulations to a movement environment elicit dissociable relations between movement time (MT) and P. M. Fitts' (1954) index of difficulty (ID). Hoffmann concludes that any such dissociation is the result of actions ev...
Article
Full-text available
The utilization of visual information for the control of ongoing voluntary limb movements has been investigated for more than a century. Recently, online sensorimotor processes for the control of upper-limb reaches were hypothesized to include a distinct process related to the comparison of limb and target positions (i.e., limb-target regulation pr...
Article
Full-text available
Researchers in the domain of haptic training are now entering the long-standing debate regarding whether or not it is best to learn a skill by experiencing errors. Haptic training paradigms provide fertile ground for exploring how various theories about feedback, errors and physical guidance intersect during motor learning. Our objective was to det...
Article
Full-text available
When a person executes a movement, the movement is more errorful while observing another person’s actions that are incongruent rather than congruent with the executed action. This effect is known as “motor contagion”. Accounts of this effect are often grounded in simulation mechanisms: increased movement error emerges because the motor codes associ...
Article
In a previous study of rapid goal-directed reaches with brief visual samples, we observed that visual information gathered by the dominant eye (cf. non-dominant eye) is sufficient to engage in online trajectory amendments. However, it is not clear if this dominant eye advantage is due to perceptual or sensorimotor processes. To elucidate this quest...
Conference Paper
Full-text available
The 'motor contagion' effect manifests when a participant performs one action while simultaneously observing an action performed by another person; observing an incongruent action relative to a congruent action results in an increase in spatial displacement along the orthogonal plane to the participant's intended movement. Motor contagion is often...
Article
Full-text available
Purpose: At rest, the central nervous system combines and integrates multisensory cues to yield an optimal percept. When engaging in action, the relative weighing of sensory modalities has been shown to be altered. Because the timing of peak velocity is the critical moment in some goal-directed movements (e.g., overarm throwing), the current study...
Article
The authors examined whether movement times (MT) for discrete saccades are constant given equivalent index of difficulty (ID) values (i.e., unitary nature of Fitts' theorem). To that end, we contrasted ID/MT relations for saccades equated for ID but differing with respect to their target amplitudes and widths. Results showed that MT increased with...
Article
Full-text available
Presenting target and non-target information in different modalities influences target localization if the non-target is within the spatiotemporal limits of perceptual integration. When using auditory and visual stimuli, the influence of a visual non-target on auditory target localization is greater than the reverse. It is not known, however, wheth...
Article
Full-text available
Fitts' (1954) classic theorem asserts that the movement time (MT) of voluntary reaches is determined by amplitude and width requirements (i.e., index of difficulty: ID). Actions associated with equivalent IDs should elicit equivalent MTs regardless of the amplitude and/ or width requirements. However, contemporary research has reported that amplitu...
Article
Full-text available
Ideomotor theory states that the neural codes that represent action and the perceptual consequences of those actions are tightly bound in a common code. For action imagination, bound action, and perceptual codes are thought to be internally activated at a sub-threshold level through action simulation. In support of this hypothesis, previous researc...