Fig. 2.
Unstructured network does not comply with rivalry constraints. a Case 1: homogenous drive raster (excitatory neuron spiking across time) exhibits homogenous response. Case 2: heterogeneous drive (b–f) b heterogeneous drive consists of independent stochastic processes for subsets of neurons within the unstructured network. c Excitatory neuron raster showing alternating activity levels between two pools in response to the heterogeneous input in b. d Levelt’s 4th proposition is not obeyed: percept durations increase with drive strength instead of decreasing. e Dominance time distribution of random network (as in c). Dominance duration coefficient of variation (CVD) depends on the report threshold (see Table 1: definitions). For example, CVD are 1.9, 0.61, and 0.34 for 0, 300, and 750 ms report thresholds, respectively. f Percept state variable (z-scored) reflects differences in the drives in b, supporting that the dominance duration statistics mirror the drive fluctuations