Fig. 6.

Correlation values between paired channels of neural features affected by the inter-electrode distance. We selected 3 days over the course of the study from Task 2 to investigate the effect of inter-electrode distance on neural features correlations. In each insertion, y-axis shows the correlation from 0 to 1 and x-axis shows the inter-elelctrode distance in mm. A data point represents the correlation value of two selected channels for a particular type of neural features time series. The solid line represents a 3rd polynomial fit of the data and dashed lines indicate its 95% confidence interval. In general, signal correlation decreases as the inter-elelctrode distance increases. Signal with higher frequency range has lower inter-electrode correlation, and TCs features has the lowest inter-electrode correlation values overall