Allocation of visual attention to spatial locations: tradeoff functions for event-related brain potentials and detection performance.

摘要: Event-related brain potentials (ERPs) were recorded in response to unilateral arrays of letters flashed rapid, randomized sequences left and right visual field locations. Subjects required focus attention exclusively on either or stimuli, divide different proportions between the two fields, with aim detecting infrequent target letters. Both d’ percent hits for detections increased significantly as attentional allocation a stimulus location increased. Attention operating characteristic (AOC) curves detection scoreswere highly similar form those amplitudes long-latency, endogenous ERP components—N350-650 P400-800 (P300). All these measures showed gradual, nearly rectangular tradeoff functions. In contrast, AOC early sensoryevoked components displayed steep, linear amplitude tradeoffs was increasingly allocated one at expense other. The late considered indices separate but interacting levels selection having principles.