(a) Simplified diagram of the Husain et al [12] model. (b) Diagram of the new model of short-term memory for long-duration tonal patterns. Key: MGN, medial geniculate nucleus; Ai, primary auditory cortex; Aii, secondary auditory cortex; ST, superior temporal gyrus/sulcus; PFC, prefrontal cortex module; FS, cue-selective units; D1, delay-selective units; D2, delay+cue-selective units; R, response units; ®, synapses onto.