Answer:
The spatial cueing or Posner cueing task (Posner, 1980) is a common paradigm for studying visual attention. For the participant, the task is easy: detect when a target stimulus is presented, and respond as quickly as possible. Usually, the stimulus appears either on the left side or the right of the screen, and participants are cued before the stimulus appears. The cue is sometimes "exogenous" (e.g., the cue appears at the same location as the upcoming stimulus), and sometimes "endogenous" (e.g., a centrally-presented arrow pointing to the location of the upcoming stimulus), but in both cases cue the participant to the potential target location.
Step-by-step explanation: