Figure 1.

Modeling Connectivity for the Suicide Implicit Association Task (S-IAT). (A) Conductance-based neural mass model for dynamic causal modeling (DCM) for electrophysiology, which includes excitatory and inhibitory connection parameters from four distinct cell layers: superficial pyramidal cells (SPs), spiny stellate cells (SSs), deep pyramidal cells (DPs), and inhibitory interneurons (IIs). Forward connections originate from SPs to both SSs and DPs. Backward connections originate from DPs to both SPs and IIs. (B) Four plausible models were constructed to account for message-passing between early visual cortex, amygdala, and insula. (C) Results from Bayesian model selection to adjudicate between the four models; the strongest evidence was found for Model 1, which had fully reciprocated forward and backward connections between each region of interest.