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Affective and non-affective touch evoke differential brain responses in 2-month-old infants

Artikel i vetenskaplig tidskrift
Författare Emma H. Jönsson
K. Kotilahti
J. Heiskala
Helena Backlund
Håkan Olausson
I. Croy
H. Mustaniemi
P. Hiltunen
J. J. Tuulari
N. M. Scheinin
L. Karlsson
H. Karlsson
I. Nissilä
Publicerad i NeuroImage
Volym 169
Sidor 162-171
ISSN 1053-8119
Publiceringsår 2018
Publicerad vid Institutionen för neurovetenskap och fysiologi
Sidor 162-171
Språk en
Ämnesord Affective touch, Diffuse optical tomography (DOT), Functional near infrared spectroscopy, Infant
Ämneskategorier Neurovetenskap

Sammanfattning

Caressing touch is an effective way to communicate emotions and to create social bonds. It is also one of the key mediators of early parental bonding. The caresses are generally thought to represent a social form of touching and indeed, slow, gentle brushing is encoded in specialized peripheral nerve fibers, the C-tactile (CT) afferents. In adults, areas such as the posterior insula and superior temporal sulcus are activated by affective, slow stroking touch but not by fast stroking stimulation. However, whether these areas are activated in infants, after social tactile stimulation, is unknown. In this study, we compared the total hemoglobin responses measured with diffuse optical tomography (DOT) in the left hemisphere following slow and fast stroking touch stimulation in 16 2-month-old infants. We compared slow stroking (optimal CT afferent stimulation) to fast stroking (non-optimal CT stimulation). Activated regions were delineated using two methods: one based on contrast between the two conditions, and the other based on voxel-based statistical significance of the difference between the two conditions. The first method showed a single activation cluster in the temporal cortex with center of gravity in the middle temporal gyrus where the total hemoglobin increased after the slow stroking relative to the fast stroking (p = 0.04 uncorrected). The second method revealed a cluster in the insula with an increase in total hemoglobin in the insular cortex in response to slow stroking relative to fast stroking (p = 0.0005 uncorrected; p = 0.04 corrected for multiple comparisons). These activation clusters encompass areas that are involved in processing of affective, slow stroking touch in the adult brain. We conclude that the infant brain shows a pronounced and adult-like response to slow stroking touch compared to fast stroking touch in the insular cortex but the expected response in the primary somatosensory cortex was not found at this age. The results imply that emotionally valent touch is encoded in the brain in adult-like manner already soon after birth and this suggests a potential for involvement of touch in bonding with the caretaker.

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