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Poster De Conférence Année : 2022

Somatosensory prediction among preschool children: a cross-sectional study

Résumé

Background: Sensory prediction (SP) is the ability to anticipate future stimulations on the basis of previous sensory inputs. It is related to mismatch detection (MMD, the ability to detect an unusual or deviant stimulus among familiar ones), and to repetition suppression (RS, the reduction of neuronal activity when a stimulus is repeated or becomes irrelevant). This work aims to describe somatosensory RS, MMD, and SP in neurotypical preschool children. We hypothesize a deactivation in the somatosensory cortex when a tactile stimulation is repeated, a fronto-central mismatch response to deviant stimuli, and a somatosensory activation with late frontal components when the stimulation is unexpectedly omitted. Method: We aim at including 60 children from 3 age groups: 2, 4, and 6 years old. Brain activity is measured using 128-channels electroencephalography (EEG). The vibrotactile oddball-omission protocol contains 290 trials (200ms-long vibrations that feel like moving on the skin on the anterior part of the forearm). RS is quantified by comparing amplitudes of potentials evoked by the first (familiarization) and the last (control) 40 standard trials. In between, 30 deviant stimuli (movement is reversed) are presented among standards and used to evaluate the MMD (amplitude difference between deviants and standard), and 30 omissions to evaluate SP (significant neuronal activation compared to baseline in the absence of an expected stimulus). So far (N=13), we observe a strong RS from 2 years of age. We need more participants to analyze MMD and SP. General implications: There is still little information on tactile processing in children despite the importance of this modality in understanding sensory impairments associated with neurodevelopmental disorders. If somatosensory predictive mechanisms can be quantified from 2 years old, they could be used as early markers to screen for atypical neurodevelopment among vulnerable populations, such as premature neonates.
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Dates et versions

hal-03994368 , version 1 (17-02-2023)

Identifiants

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A-L Marais, M Anquetil, V Dumont, Nadege Roche-Labarbe. Somatosensory prediction among preschool children: a cross-sectional study. Flux, Sep 2022, Paris, France. 2022, ⟨10.13140/RG.2.2.12702.41289⟩. ⟨hal-03994368⟩
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