Modelling novelty detection in the thalamocortical loop
Fig 10
Sensitivity of SSA and true deviance detection to the lateral cortical connections.
(A) Overexcited and balanced L4 population activity evoked by a brief D2 whisker deflection (marked under the time axis) given fast and slow recovery timescales of L4 depressing synapses, respectively. The starred value in the title denotes the parameter’s default value. (B) Dependence of SSA in L4, L6 and thalamus on the logarithmically-scaled recovery time constant of L4 synapses, τrec,L4. The regimes for overexcited and balanced cortical activity are respectively represented in grey and white backgrounds. (C) Same as (B), but for L6 synapses, τrec,L6. (D-G) Dependence of SSA and true deviance detection on the intra- and inter-columnar connection strengths within L4, ,
, and L6,
,
. All responses fall into the regime of balanced activity when modifying these lateral and recurrent connections. The starred values under the horizontal axes represent the parameters’ default values. The random seed of model simulation is kept fixed when changing the values of each connection parameter.