Fig. 2 | npj Digital Medicine

Fig. 2

From: The details of past actions on a smartphone touchscreen are reflected by intrinsic sensorimotor dynamics

Fig. 2

Early cortical somatosensory processing reflects the history of Social App usage. a We estimated the signal-to-noise ratio in the cortical responses upon a brief tactile stimulus presented to the right thumb tip, the hand was in a resting position during the recording. The head plot shows the electrode location with the best response (red). b Putative signal-to-noise ratio (SNR) at the electrode (SS, sum of squares). Individual volunteers (gray lines) and population mean (black). c Scalp map of SNR at 80 ms post stimulation. d Event-related coefficients with the SNR as dependent variable and touchscreen parameters based on the entire 21 days of recording as explanatory variables. Statistically significant coefficients (thickened lines, p < 0.05, corrected for multiple comparisons, ANOVA). d’ The strength of the relationship with the typical rate varies as a function of the data collection period [assessed by using a 72 h sliding window, sliding with 12 h steps]. The data collected 9 days prior to the experiment yielded the strongest correlation. e–h Head plots of the coefficients and the corresponding variables. The statistics included all electrodes and time points, but select time points are shown to illustrate the statistical maps of the significant relationships

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