Maternal sensitivity and infant neural response to touch: an fNIRS study

Area of Science:

• Developmental Neuroscience
• Maternal-Infant Interaction
• Neuroimaging

Background:

• Maternal attunement influences infant emotional needs and maternal touch.
• Maternal touch modulates infant physiological responses to affective touch.
• The impact of maternal sensitivity on infant brain-level touch processing remains unclear.

Purpose of the Study:

• To investigate the association between maternal sensitivity at 7 months and infant cortical activation patterns to touch at 12 months.
• To explore how maternal sensitivity relates to neural processing of affective and discriminative touch in infants.
• To understand the long-term effects of maternal interaction quality on infant sensory processing.

Main Methods:

• Functional near-infrared spectroscopy (fNIRS) measured brain activation in 24 infants.
• Changes in oxy-hemoglobin (HbO2) and deoxy-hemoglobin (HHb) were recorded in the somatosensory and temporal cortices.
• Infants received two types of tactile stimulation: affective and discriminative touch.

Main Results:

• Lower maternal sensitivity correlated with higher HbO2 response to discriminative touch in the temporal region.
• Infants of less sensitive mothers showed a trend towards higher HbO2 response to affective touch in the somatosensory region.
• These neural responses suggest altered touch processing in infants exposed to less sensitive maternal interactions.

Conclusions:

• Maternal sensitivity is associated with distinct patterns of cortical activation in response to touch in 12-month-old infants.
• Less sensitive maternal interactions may lead to reduced exposure to maternal touch, impacting infant neural processing.
• Findings highlight the crucial role of maternal sensitivity in shaping infant sensory and neural development.