Parameters used for the full AN-CN-IC-CX and reduced AN-CX models of the auditory brain (where these differ for the LTD magnitude (<i>α</i>_<i>d</i>), the AN-CX parameters are given as second values following a slash).

AN—auditory nerve; CN—cochlear nucleus with three subpopulations of cells discriminated based on their connectivity: chopper (CH), primary-like (PL) and onset (ON); IC—inferior colliculus; A1—primary auditory cortex; Belt—belt area of the auditory cortex. The parameters were found to be optimal using a grid search heuristic on a two vowel recognition task (see [10] for details). This parameter search resulted in the best model performance when no inhibitory recurrent connections were present in the CH and PL subpopulations of the CN ( nA). The sparse connectivity parameter for the AN to ON connections defines the proportion of dead synapses between these two layers.