For the repeated intention (RI) condition (Figure 4A in red, Figure 4B), only four time periods of stability were detected (i.e., Repeated Intention-Map (RI-map) 1: 0–30 ms; RI-Map 2: 32–100 ms; RI-Map 3: 102–240 ms; RI-Map 4: 242–400 ms; Figure 4D).
More precisely, the GFP peaked at 126 ms for novel intentions, although group-averaged GFP for the repeated intention condition was almost extinguished at the same time period (P<0.05).
In line with prior behavioral studies of adaptation, repeated intentions were identified more accurately (72%) than new intentions (58%).
A significant main RS effect was observed for intentions across types (F 1,23) = 18.75; P<0.0004), suggesting that new intentions (567 ms) are recognized faster than repeated intentions (649 ms).
It was performed across time and experimental conditions in order to determine whether and when novel versus repeated intentions engaged distinct configurations of intracranial generators.
A significant adaptation effect was also observed for speed of decoding intentions as ascertained by reaction times, which showed faster intention decision making for new (567 ms) versus repeated intentions (649 ms).
VEPs data from novel and repeated intentions were then submitted to a brain microstate analysis in order to detect every period of brain state stability (microstate) after hand-on-object interaction [45].
EEG global field power was reduced with repeated intentions at an early (starting at 60 ms) and a later (∼330 ms) period after the onset of a hand-on-object encounter.
In agreement, the present fMRI RS results revealed a systematic increase of activation in the right MTG/STS, inferior parietal lobule (IPL), aIPS, and inferior frontal gyrus (IFG) in response to the presentation of new intentions as opposed to repeated intentions.
The reliability of this difference observed at the group-averaged level was confirmed at the individual level using a Bonferroni corrected paired t-test on GFP (significant greater GFP difference for novel intentions in comparison with repeated intentions from 118 ms to 134 ms, with a peak at 126 ms; t = 2.71; P = 0.013).
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