Part of a series of investigations into 'cognitive styles' (individual consistencies in cognitive behaviors—perception, memory, learning, and others), the present study describes two independent cognitive control principles: field-articulation and scanning. Using various laboratory situations (embedded figures, rod and frame error, size estimation, illusions of several types, and a kinesthetic aftereffect technique) the author isolates three factors relative to attention deployment. One of these is the field-articulation factor in which attention is limited to certain aspects of a problem; a second factor is that of scanning, the sampling of various aspects of the stimulus field. A third factor, proneness to stimulus satiation, is found to be less clearly related to the deployment of attention than are the other two.