Figure 1. Lake trout (top) and a lake trout brain with letters indicating the regions measured in the present study (bottom). The olfactory bulbs (A) process olfactory information. The telencephalon (B) is primarily associated with spatial navigation and learning. The optic tectum (C) processes visual and multimodal sensory information used for orientation. The cerebellum (D) is associated with motor coordination and learning. The hypothalamus (E) is involved in behavioral and neuroendocrine control (Huber et al. 1997, Pollen et al. 2007).