BALANCING FOCUS AND DISTRACTION: THE ROLE OF THE SUPERIOR COLLICULUS IN VISUAL ATTENTION AND DISTRACTION RESILIENCE

The ability to maintain focus in the presence of competing sensory stimuli is a defining feature of visual attention. Classical accounts propose that distractors are avoided through suppression mechanisms that filter irrelevant inputs before they influence behavior. Our findings suggest a complementary view: distractor engagement is not simply a failure of suppression but rather reflects whether sensory signals are permitted to access motor circuits through active routing. Using freely moving mice performing visual search tasks, we previously showed that responses to distractors vary and can be predicted from the neural state preceding stimulus onset, indicating that distraction is governed by internal circuit dynamics rather than stimulus strength alone. These observations implicate the superior colliculus (SC) as a key node where sensory and cortical signals interact to determine whether visual events are ignored or translated into orienting actions.
To dissect the underlying mechanisms, we developed a head-fixed attention-distractor paradigms for large-scale recordings and pathway-specific manipulations of cortico–collicular projections. Ongoing experiments examine how cortical inputs shape the SC excitability and gate the impact of visual signals during goal-directed behavior. Preliminary results indicate that visual input is insufficient to drive collicular output, and that upstream cortical activity regulates when sensory events gain access to action. We are currently testing whether this gating arises from state-dependent gain modulation, thresholding, or circuit-level computations within the SC. Together, this work supports a framework in which attention emerges from state-dependent routing within cortico–subcortical networks, positioning the SC as a hub for balancing focus and distraction.