What is Selective attention?
Selective attention is the cognitive process of focusing on relevant information while filtering out irrelevant stimuli. It determines what enters conscious awareness from the vast stream of sensory input the brain receives.
How it works
Broadbent’s filter model proposed that attention acts as a bottleneck: only information passing through the attentional filter reaches conscious processing. Later models (Treisman, Deutsch & Deutsch) debated where in the processing stream selection occurs, but all agree that attention is selective and limited. Selective attention means that people literally do not see things they are not attending to (inattentional blindness), and that what captures attention is determined by both top-down (goals, expectations) and bottom-up (novelty, salience) factors.
Applied example
A person scrolling through a social media feed automatically notices posts from close friends and high-contrast images while skipping text-heavy content from acquaintances. Their selective attention filter is tuned to social relevance and visual salience, meaning advertisers must compete for the same limited attentional bandwidth.
Why it matters
Selective attention is the gateway to all conscious experience and decision-making, making it the fundamental constraint that behavioral designers must work with or around.
