Common or distinct deficits for auditory and visual hallucinations?

The dual-deficit model of visual hallucinations (Collerton et al. target article) is compared with the dual-deficit model of auditory hallucinations (Waters et al., in press). Differences in cognitive mechanisms described may be superficial. Similarities between these models may provide the basis fora general model of complex hallucinations extended across disorders and modalities, involving shared (overlapping) cognitive processes.