Fig. 2.

Multiple loops for gaze control interconnect eye and head platforms. The stimuli are the vestibular system (through VN) and visual targets (through SC). A: connections with SC are highlighted in blue, and modeled cell types are denoted in red. Dashed cerebellar pathways to/from fastigial nucleus interconnect with all shown sites in the brain stem, especially during saccades. this is consistent with data referred to by Noda et al. (1990) and Optican (2005) but now represented in a different, extended, network topology. B: the cerebellar projections are absorbed into the brain stem structure using appropriate parameters (see text). Each lumped element in B–D (double-lined blocks) embeds both the named site and its local cerebellar projections. C and D: a few loop examples for head (blue) and eye (green) with shared elements, with OPNs off and SLBNs on during the saccadic phase (C) and with OPNs on and SLBNs off during the fixation phase (D). The SC gaze loop in C is also active in D using NPH and DTN (not shown for clarity). See glossary for definitions.