Neural correlates of gentle skin stroking in early infancy. (February 2019)

• Record Type: Journal Article
• Authors: Tuulari, Jetro J.; Scheinin, Noora M.; Lehtola, Satu; Merisaari, Harri; Saunavaara, Jani; Parkkola, Riitta; Sehlstedt, Isac; Karlsson, Linnea; Karlsson, Hasse; Björnsdotter, Malin
• Is Part Of: Developmental cognitive neuroscience. Volume 35(2019)
• Page Start: 36
• Page End: 41
• Publication Date: 2019-02
• Subjects: Infants -- Development -- fMRI -- Touch -- Social touch; Cognitive neuroscience -- Periodicals; Developmental neurobiology -- Periodicals; Neuropsychology -- Periodicals; Neuropsychiatry -- Periodicals; 612.8233
• DOI: 10.1016/j.dcn.2017.10.004
• Languages: English
• ISSNs: 1878-9293

Abstract

Highlights: The infant brain is sensitive to gentle skin stroking within the first weeks of age. The postcentral gyrus and posterior insular cortex are responsive to stroking. Social touch activates both somatosensory and socio-affective brain areas in infancy. Abstract: Physical expressions of affection play a foundational role in early brain development, but the neural correlates of affective touch processing in infancy remain unclear. We examined brain responses to gentle skin stroking, a type of tactile stimulus associated with affectionate touch, in young infants. Thirteen term-born infants aged 11–36 days, recruited through the FinnBrain Birth Cohort Study, were included in the study. Soft brush strokes, which activate brain regions linked to somatosensory as well as socio-affective processing in children and adults, were applied to the skin of the right leg during functional magnetic resonance imaging. We examined infant brain responses in two regions-of-interest (ROIs) known to process gentle skin stroking – the postcentral gyrus and posterior insular cortex – and found significant responses in both ROIs. These results suggest that the neonate brain is responsive to gentle skin stroking within the first weeks of age, and that regions linked to primary somatosensory as well as socio-affective processing are activated. Our findings support the notion that social touch may play an important role in early life sensory processing. Future research will elucidate the significance of these findings for human brain development.