Remembering touch: Somatosensory cortex supports long-term memory for dynamic vibrotactile patterns.
The neural substrates of tactile long-term memory (LTM) in humans remain poorly understood, as relatively few neuroimaging studies have addressed this question. Here, we asked whether retrieval of tactile stimulation engages modality-specific representations in the primary and secondary somatosensory cortices (S1 and S2), alongside domain-general retrieval networks. Participants learned 16…
Tactile long-term memory in humans remains a mystery, with limited neuroimaging studies exploring this topic. Researchers investigated whether the brain's memory processes are modality-specific or involve general cognitive networks. Participants were taught 16 unique tactile patterns, each lasting 1.2 seconds on their left thumb using a Braille-like display with 10 vibrating dots. Over three sessions, the participants later performed a recognition task in functional magnetic resonance imaging (fMRI) scans.
In the final group (26 participants), successful recognition of learned patterns correlated with increased activity in the contralateral somatosensory cortices (S1 and S2), as well as in the hippocampus. Additionally, frontal and parietal regions associated with memory retrieval were activated. A psychophysiological interaction analysis (PPI) revealed that successful recognition during fMRI scans was linked to increased connectivity between the hippocampus and the contralateral somatosensory cortices.
This study indicates that tactile long-term memory retrieval is not just a domain-general process but relies on coordinated interactions between the hippocampus and the somatosensory cortices. Further research may uncover specific long-term memory representations within these brain regions.
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