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Authors & Affiliations
Wenyu Wan, Arko Ghosh
Abstract
Real world information received by sensory systems is highly dynamic. If and how the recent temporal dynamics, as in the preceding intervals, shape cortical processing is unclear. Here we recorded the cortical signals (EEG) in response to a dynamic train of tactile stimulations applied at the fingertips ( n = 64). We separated the cortical signals according to the next interval dynamics by using a joint-interval distribution (JID) spanning 100ms to 10s. This yielded a two-dimensional event-related potential (JID-ERP) at all the examined time points of the EEG signal (-200 to 300 ms latency from stimulation). The early (∼50-75 ms) and the late (~150-300 ms) cortical signals were similarly shaped by the temporal dynamics – with a dominant role of the most recent interval. Within the intermediate stages (~75-150 ms) there were substantial fluctuations for the preferred interval dynamics from one period to the next - with a role of the preceding intervals. These fluctuating patterns of preference were dissimilar to the patterns observed in the early or late cortical stages. Data-driven dimensionality reduction of the JID-ERP across the entire sample revealed up to three prototypical patterns of preferred interval dynamics. Some of these patterns were selectively found at the intermediate stages of processing. Our findings support the idea that the intermediary stage of cortical processing plays a unique role in temporal processing of tactile information. We propose that the cortical processing of tactile information according to its rich temporal history supports real world sensory functions.