Somatosensory temporal discrimination threshold changes during motor learning

Yoshida, Naoshin; Suzuki, Toshikazu; Ogahara, Kakuya; Higashi, Toshio; Sugawara, Kenichi

doi:10.1080/08990220.2020.1830755

Cited by 3 publications

(3 citation statements)

References 39 publications

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“…Accordingly, previous studies have shown that during movement execution, STDT-related tactile information is gated to prioritize movement-related sensory inflow [ 7 , 9 ]. Previously, several works have suggested that this process takes place at the subcortical level, and specifically in striatum–thalamus circuits [ 7 , 8 ].…”

Section: Discussionmentioning

confidence: 99%

“…STDT involves the activation of cortical structures, specifically the inhibitory interneuronal circuits in the primary somatosensory cortex (S1) [ 4 , 5 ] and the subcortical structures, i.e., the basal ganglia and thalamus [ 1 , 6 ]. Previous studies in healthy humans have shown that STDT values are modulated by voluntary movement execution [ 7 , 8 ]. Movement execution increases STDT values through mechanisms of sensorimotor integration, modulating the physiological gating of tactile inputs that have been hypothesized to occur in basal ganglia–thalamus connections in healthy humans [ 7 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

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Investigating the Effects of a Focal Muscle Vibration Protocol on Sensorimotor Integration in Healthy Subjects

et al. 2023

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Background: The ability to perceive two tactile stimuli as asynchronous can be measured using the somatosensory temporal discrimination threshold (STDT). In healthy humans, the execution of a voluntary movement determines an increase in STDT values, while the integration of STDT and movement execution is abnormal in patients with basal ganglia disorders. Sensorimotor integration can be modulated using focal muscle vibration (fMV), a neurophysiological approach that selectively activates proprioceptive afferents from the vibrated muscle. Method: In this study, we investigated whether fMV was able to modulate STDT or STDT–movement integration in healthy subjects by measuring them before, during and after fMV applied over the first dorsalis interosseous, abductor pollicis brevis and flexor radialis carpi muscles. Results: The results showed that fMV modulated STDT–movement integration only when applied over the first dorsalis interosseous, namely, the muscle performing the motor task involved in STDT–movement integration. These changes occurred during and up to 10 min after fMV. Differently, fMV did not influence STDT at rest. We suggest that that fMV interferes with the STDT–movement task processing, possibly disrupting the physiological processing of sensory information. Conclusions: This study showed that FMV is able to modulate STDT–movement integration when applied over the muscle involved in the motor task. This result provides further information on the mechanisms underlying fMV, and has potential future implications in basal ganglia disorders characterized by altered sensorimotor integration.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigating the Effects of a Focal Muscle Vibration Protocol on Sensorimotor Integration in Healthy Subjects

et al. 2023

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“…Regarding the somatosensory variables, one possible explanation for the lack of effects was that our cutaneous somatosensory variables (cutaneous mechanical and pain pressure thresholds, etc.) were different to the sensory variables actually implied in motor performance and learning, such as proprioception or limb position [ 69 , 70 , 71 , 72 ]. Nevertheless, other works proposed that somatosensory processing is modulated by M1 stimulation [ 73 ], such as a-tDCS effect over M1 increasing somatosensory-evoked potentials [ 74 ] or reducing capsaicin-induced hyperalgesia [ 75 ].…”

Section: Discussionmentioning

confidence: 99%

Reversed Polarity bi-tDCS over M1 during a Five Days Motor Task Training Did Not Influence Motor Learning. A Triple-Blind Clinical Trial

et al. 2021

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Transcranial direct current stimulation (tDCS) has been investigated as a way of improving motor learning. Our purpose was to explore the reversal bilateral tDCS effects on manual dexterity training, during five days, with the retention component measured after 5 days to determine whether somatosensory effects were produced. In this randomized, triple-blind clinical trial, 28 healthy subjects (14 women) were recruited and randomized into tDCS and placebo groups, although only 23 participants (13 women) finished the complete protocol. Participants received the real or placebo treatment during five consecutive days, while performing a motor dexterity training program of 20 min. The motor dexterity and the sensitivity of the hand were assessed pre- and post-day 1, post 5 days of training, and 5 days after training concluded. Training improved motor dexterity, but tDCS only produced a tendency to improve retention. The intervention did not produce changes in the somatosensory variables assessed. Thus, reversal bi-tDCS had no effects during motor learning on healthy subjects, but it could favor the retention of the motor skills acquired. These results do not support the cooperative inter-hemispheric model.

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The neural basis of somatosensory temporal discrimination threshold as a paradigm for time processing in the sub-second range: An updated review

Ordás,

Alonso-Frech

2024

Neuroscience & Biobehavioral Reviews

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Somatosensory temporal discrimination threshold changes during motor learning

Cited by 3 publications

References 39 publications

Investigating the Effects of a Focal Muscle Vibration Protocol on Sensorimotor Integration in Healthy Subjects

Investigating the Effects of a Focal Muscle Vibration Protocol on Sensorimotor Integration in Healthy Subjects

Reversed Polarity bi-tDCS over M1 during a Five Days Motor Task Training Did Not Influence Motor Learning. A Triple-Blind Clinical Trial

The neural basis of somatosensory temporal discrimination threshold as a paradigm for time processing in the sub-second range: An updated review

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