Rethinking attention: A unified perspective on top-down and bottom-up processes
Seyed Javad Saghravanian
Abstract
Attention enables organisms to prioritize information in environments where neural and cognitive resources are limited. Traditionally, this process has been understood as the outcome of two distinct mechanisms: top-down control, shaped by goals and expectations, and bottom-up reactivity to salient stimuli. However, growing evidence from neuroscience, psychology, and evolutionary theory challenges the clarity and sufficiency of this dichotomy. This review proposes a unified framework in which attentional selection emerges from a single system guided by overlapping priorities across three timescales: evolutionary imperatives (e.g., survival), learned experiences (e.g., value-based biases), and immediate task demands. Rather than two interacting systems, top-down and bottom-up processes are reinterpreted as different temporal expressions of the same underlying mechanism. This perspective offers a reconceptualization of classical models and encourages a more integrated interpretation of neural and behavioral data.