Detection of movement related cortical potentials in freehand drawing on digital tablet

Freehand Digital Drawing: a Boost to Creative Design. The Observer's Eye and the Draftsman Brain

“…In the shown monitor real data are presented; from top to bottom: the EEG, EMG, X and Y coordinates of the pen position, analogic output from the piezoelectric sensor, pen down state, digitized trigger signal from the piezoelectric sensor. In the bottom set a photographic detail of the pen tip is shown, with the piezoelectric sensor securely held in place with two glue drops (From Leandri et al 2021).…”

“…The experiment 1 reported here has been performed in the first year of the doctorate and was preliminary to experiments 2 and 3. It has been the object of a publication in the Journal of the Neuroscience Methods (Leandri et al, 2021). Most of the text of the paragraphs describing and discussing experiment 1 is a transcript of the published paper, as are the related figures 3.21, 3.22, 3.23 and 3.24 and the table 3.1.…”

“…Previous papers have shown that the MRP signal is extremely small, of the order of few microvolts (Gerloff et al, 1997;Leandri et al, 2021;Shibasaki, 2012).…”

“…The time window used for analysis started 800 ms before movement and ended 800 ms after it, so, in all, 1600 ms of electrical activity were analysed. The components of the MRP in freehand drawing have been described in the part of this research already object of publication (Leandri et al, 2021). They are referred to by their polarity (Positive or Negative) and the time point, in ms, where they peak (with a minus sign -for before trigger and plus sign + for after trigger).…”

“…The piezoelectric signal is smaller than in condition one, signifying that a lesser effort has been used in tapping. T0 is the onset of the piezoelectric signal and the time reference to all traces (From Leandri et al 2021).…”