Table 1.

Table 1a. Factors that may affect correspondence between Granger causality & coherency.
The presence of reciprocal connections between brain areas
Conflation of connection strength and temporal offset in the time domain
Differences in HRF shape between areas
The length of the time series available

Table 1b. Factors that will affect use of both methods
Low-pass filtering by the HRF
Subsampling of the BOLD response
Ensuring that interactions between areas are consistent when the methods are applied