Computer-implemented method for enhancing cognition of a participant using visual search. A target image and distracter image are provided for visual presentation. Multiple images, including the target image and multiple distracter images based on the distracter image, are temporarily visually presented at respective locations, then removed. The participant selects the target image location from multiple locations in the visual field, and the selection's correctness/incorrectness is determined. The visually presenting, requiring, and determining are repeated to improve the participant's cognition, e.g., efficiency, capacity and effective spatial extent of a participant's visual attention. In a dual attention version, potential target images differing by a specified attribute are provided, one of which is the target image. An indication of the specified attribute is also displayed. The participant selects the location of the target image from the multiple locations, including the locations of the potential target images, based on the indication.

 
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