Effects of vibratory stimulation-induced kinesthetic illusions on the neural activities of patients with stroke

Takayuki Kodama, Hideki Nakano, Hironori Ohsugi, Shin Murata, Takayuki Kodama, Hideki Nakano, Hironori Ohsugi, Shin Murata

Abstract

[Purpose] This study evaluated the influence of vibratory stimulation-induced kinesthetic illusion on brain function after stroke. [Subjects] Twelve healthy individuals and 13 stroke patients without motor or sensory loss participated. [Methods] Electroencephalograms were taken at rest and during vibratory stimulation. As a neurophysiological index of brain function, we measured the μ-rhythm, which is present mainly in the kinesthetic cortex and is attenuated by movement or motor imagery and compared the data using source localization analyses in the Standardized Low Resolution Brain Electromagnetic Tomography (sLORETA) program. [Results] At rest, μ-rhythms appeared in the sensorimotor and supplementary motor cortices in both healthy controls and stroke patients. Under vibratory stimulation, no μ-rhythm appeared in the sensorimotor cortex of either group. Moreover, in the supplementary motor area, which stores the motor imagery required for kinesthetic illusions, the μ-rhythms of patients were significantly stronger than those of the controls, although the μ-rhythms of both groups were reduced. Thus, differences in neural activity in the supplementary motor area were apparent between the subject groups. [Conclusion] Kinesthetic illusions do occur in patients with motor deficits due to stroke. The neural basis of the supplementary motor area in stroke patients may be functionally different from that found in healthy controls.

Keywords: Kinesthetic illusion; Stroke; Supplementary motor area.

Figures

Fig.1.
Fig.1.
Neural activity in the μ-wave range at rest. a: Healthy group. b: Patient group. Areas of the brain where the μ- and α-waves significantly increased are indicated in yellow and red. c: Comparison of the neural activities of the healthy and patient groups. Areas of the brain where the μ- and α-waves significantly increased compared to the patient group are indicated in yellow and red. Color scale values below the images indicate t-values (t = 2.288)
Fig. 2.
Fig. 2.
Neural activity in the μ-wave range during vibratory stimulation. a: Neural activity in the μ-wave range of the healthy group. b: Neural activity in the μ-wave range of the patient group. Brain areas where the μ- and α-waves significantly increased are indicated in yellow and red.. c: Comparison of the neural activities of the healthy and patient groups. Areas of brain where the μ- and α-waves significantly increased in the healthy group compared to the patient group are indicated in yellow and red, and areas of the brain where the μ- and α-waves significantly increased in the patient group compared to the healthy group are indicated in light blue and blue. Color scale values below the images indicate t-values (t = 2.264)

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Source: PubMed

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