The visual model (Tagamets & Horwitz 1998) performs a set of tasks, specifically a delayed match-to-sample (DMS) task for shape, and a "passive" viewing task. We chose the DMS task because there exist much functional neuroimaging, neuroanatomical, electrophysiological, and cognitive data in human and nonhuman primates relevant for this type of task. The DMS task involves the presentation of a shape, a delay, and the presentation of a second shape; the model has to decide if the second stimulus is the same as the first. Multiple trials (e.g., 10) are used to simulate an fMRI or PET study.
We incorporated four major brain regions of the ventral occipitotemporal pathway into the visual model: ((1) primary visual cortex (V1/V2); (2) occipitotemporal cortex (V4); (3) inferior temporal cortex (IT); and (4) prefrontal cortex (PFC) (see Fig. 1). Each region contains populations of neuronal
Visual Model Auditory Model
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