Table 1. Key Concepts.

Cause of disorder	Intervention outcomes	Interventions in developmental models	Types of simulated interventions
Monogenic (single cause)	Does the intervention generalize beyond the treated items to other items or skills?	Does intervention improve performance on the training set?	Behavioral (add new items to/change frequency distribution of training set)
Polygenic (multiple causes)	Is there maintenance of gains after the intervention ceases?	Does intervention improve performance on the generalization set (novel items)	Computational (alter the computational properties of the learning mechanisms)
			Compensatory (encourage alternate mechanisms/pathways to acquire target behaviors)