Abstract
Focusing attention involves suppressing responses to distracting stimuli. In the barn owl, target selection involves competitive interactions in the optic tectum, which are influenced by both stimulus-driven and endogenous effects, and both were abolished by the inhibition of a midbrain circuit in the nucleus isthmi pars magnocellularis (Imc). Input to the Imc from multisensory and endogenous sources was transformed into an inhibitory output that was potent enough to exert competitive suppression across the midbrain network, thereby demonstrating a mechanism for the prioritization and selection of the most important stimulus.
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