auditory startle reflex? part here:
“In the reticular pathway of the brainstem and the mesencephalus, several synapses occur. It’s here that the auditory information is integrated with all the other sensory modalities to be ‘triaged’ into which has the highest priority at any given moment. In other words, the reticular pathways participate with the wake and the motivation centres in selectioning the information that should be treated as priority by the brain.
After the reticular formation, the non-primary pathway leads to the non-specific thalamus, then to the polysensory cortex.”