Figure 4. Dynamic variations of granger causality, global efficiency and causal density during the incorrect tasks in both the original and the reduced dimensionality (20 trials for 6 rats).

The data are divided into six 1(4 s pre and 2 s post the tripping time). The red triangle indicates the tripping time of the infrared sensor in the Y-maze. (A) Dynamic variations of the granger causality matrixes during an incorrect trial of rat 1. (B) The variations of granger causality (left), global efficiency (middle) and causal density (right) during the incorrect tasks (20 trials for 6 rats) and the correct trials (80 trials for 6 rats) in the original dimensionality. The feature values in the correct trials are significantly higher 2 s (GC, E, CD) and 1 s (E, CD) pre the tripping time than those in the incorrect trials (t test, ^* P<0.05, ^** P<0.01). No statistical difference is found at the WMBS between the incorrect and the correct trials (t test, P>0.05). (C) The variations of granger causality (left), global efficiency (middle) and causal density (right) during the incorrect tasks (20 trials for 6 rats) and the correct trials (80 trials for 6 rats) in the reduced dimensionality. The feature values in the correct trials are significantly higher 2 s (GC_PC, E_PC, CD_PC) and 1 s (GC_PC, E_PC, CD_PC) pre the tripping time than those in the incorrect trials (t test, ^** P<0.01). In addition, the feature values were significantly higher at the WMBS in the incorrect trials (t test, ^* P<0.05).