3D-Video-fMRI: 3D Motion Tracking in a 3T MRI Environment

Fernandes, José Maria; Tafula, Sérgio Miguel Neves; Cunha, João Paulo Silva

doi:10.1007/978-3-642-21596-4_7

Cited by 2 publications

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“…In the present paper, we determined the effect of interval duration, serial structure, the sensory-cued or internal-driven nature of rhythmic movements (synchronization or continuation phase), and the stimulus modality used as an interval marker on the cyclic control of the hand movement during the SCT execution by trained monkeys. The speed profile of the tapping movements was carried out using semiautomatic video-tracking algorithms (Fernandes et al 2011), which allowed the identification of the beginning and end of each tapping movement, as well as the duration of the pause of movement in the trial sequence of the SCT. An initial analysis demonstrated a linear increase in the variance of pause-duration as a function of interval, while the variance of the motor implementation is relatively constant across the produce intervals.…”

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Monkeys time their pauses of movement and not their movement-kinematics during a synchronization-continuation rhythmic task

Donnet

Bartolo

Fernandes

et al. 2014

Journal of Neurophysiology

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A critical question in tapping behavior is to understand whether the temporal control is exerted on the duration and trajectory of the downward-upward hand movement or on the pause between hand movements. In the present study, we determined the duration of both the movement execution and pauses of monkeys performing a synchronization-continuation task (SCT), using the speed profile of their tapping behavior. We found a linear increase in the variance of pause-duration as a function of interval, while the variance of the motor implementation was relatively constant across intervals. In fact, 96% of the variability of the duration of a complete tapping cycle (pause + movement) was due to the variability of the pause duration. In addition, we performed a Bayesian model selection to determine the effect of interval duration (450-1,000 ms), serial-order (1-6 produced intervals), task phase (sensory cued or internally driven), and marker modality (auditory or visual) on the duration of the movement-pause and tapping movement. The results showed that the most important parameter used to successfully perform the SCT was the control of the pause duration. We also found that the kinematics of the tapping movements was concordant with a stereotyped ballistic control of the hand pressing the push-button. The present findings support the idea that monkeys used an explicit timing strategy to perform the SCT, where a dedicated timing mechanism controlled the duration of the pauses of movement, while also triggered the execution of fixed movements across each interval of the rhythmic sequence.

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confidence: 99%

Monkeys time their pauses of movement and not their movement-kinematics during a synchronization-continuation rhythmic task

Donnet

Bartolo

Fernandes

et al. 2014

Journal of Neurophysiology

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“…To monitor subject's task performance, most commonly, cameras are used [8]. However, a large system with multiple This works is supported by ARC Future fellowship grant FT200100329.…”

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confidence: 99%