TRF analysis & figure on parcellated data

[cedricfoucault]

Related to #17.

The objective of this issue is to obtain a figure showing the brain location and time course of the effect of laserMiss vs. laserHit at the group level, using a TRF-based approach and working on source-reconstructed data at the parcel level. As a first approach to this analysis, we will select parcels of interest based on previous literature and a priori hypotheses on integration of evidence and belief updating (e.g. parcels corresponding to anterior cingulate cortex and medial anterior regions of the brain).