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Unisensory and multisensory Self-referential stimulation of the lower limb : An exploratory fMRI study on healthy subjects

The holistic view of the person is the essence of the physiotherapy.
Knowledge of approaches that develop the whole person promotes better patient
outcomes. Multisensory Self-referential stimulation, more than a unisensory one,
seems to produce a holistic experience of the Self (Core-Self). OBJECTIVES:
(1) To analyze the somatotopic brain activation during unisensory and multisensorial
Self-referential stimulus; and
(2) to understand if the areas activated by
multisensorial Self-referential stimulation are the ones responsible for the
"Core-Self." METHODS: An exploratory functional magnetic resonance imaging (fMRI)
study was performed with 10 healthy subjects, under the stimulation of the lower
limbs with three Self-referential stimuli: unisensory auditory-verbal, unisensory
tactile-manual, and multisensory, applying the unisensory stimuli simultaneously.
RESULTS: Unisensory stimulation elicits bilateral activations of the
temporoparietal junction (TPJ), of the primary somatosensory cortex (S1), of the
primary motor cortex (BA4), of the premotor cortex (BA6) and of BA44;
multisensory stimulation also elicits activity in TPJ, BA4, and BA6, and when
compared with unisensory stimuli, activations were found in: (1) Cortical and
subcortical midline structures-BA7 (precuneus), BA9 (medial prefrontal cortex),
BA30 (posterior cingulated), superior colliculum and posterior cerebellum; and
(2) Posterior lateral cortex-TPJ, posterior BA13 (insula), BA19, and BA37.
Bilateral TPJ is the one that showed the biggest activation volume. CONCLUSION:
This specific multisensory stimulation produces a brain activation map in regions
that are responsible for multisensory Self-processing and may represent the
Core-Self. We recommend the use of this specific multisensory stimulation as a
physiotherapy intervention strategy that might promote the Self-reorganization.

Langue : ANGLAIS

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