The large-scale auditory model that was developed by Husain et al. (2004) implements a DMS task for auditory objects. The key features that we chose to model were frequency sweeps, and the auditory objects, which we call tonal contours (TC), consist of combinations of sweeps and pure tones, each TC lasting about 350 msec (Fig. 3). Other auditory features, such as timbre, are not included in the model. Like the visual model, the auditory model contains four major modules (see Fig. 1): (1) primary sensory cortex (A1/A2), where neurons respond in a tonotopically-organized fashion to up and down frequency sweeps ; (2) secondary sensory cortex (e.g., lateral and parabelt auditory cortex, labeled Aii), where neurons respond to longer up and down sweeps, as well as to changes in the direction of frequency sweeps; (3) an area in the superior temporal gyrus and/or sulcus (ST) similar to IT where a complex sound is represented in a distributive manner in the neuronal population; and (4) a prefrontal module analogous to that in the visual model.
Timeline of a DMS Trial
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