That is the Stroop test.
Michael Posner names a task that tests one's ability to manipulate this phenomenon that mixes valid and invalid trials that change the location of the stimulus. That task detects saccades to differentiate between overt and covert versions of this phenomenon. The "top-down" orientation of this phenomenon is more goal-driven than in the "bottom-up" orientation. This phenomenon can employ either "conjunction" or "feature" searches according to Anne (*) Treisman's feature integration model of this phenomenon. When people are asked to name the colors of words that depict different colors, this phenomenon experiences interference. That is the Stroop test. This phenomenon namesake "blindness" was demonstrated in an experiment where viewers were asked to watch a basketball as a person in a gorilla suit walked across the camera. Deficiency in this ability may be treated with drugs like Ritalin. For 10 points, name this phenomenon, which is one's capacity to focus on something.
Michael Posner names a task that tests one's ability to manipulate this phenomenon that mixes valid and invalid trials that change the location of the stimulus.
attention