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Role of task-directed attention in nonconscious and conscious response priming by form and color.

Prior research on visual priming suggests that during nonconscious processing attention can be directed to single stimulus dimensions such as form or color. In the current experiment, nonconscious priming was compared to conscious priming by employing masking techniques that render primes invisible (masked) or visible (unmasked) to the observers. Observers were asked to respond to the form, the color, or the combination of form and color of the mask-probe that followed either a masked or an unmasked prime. The prime varied in its form and color congruency relative to the mask-probe. The results indicate (1) that during nonconscious processing a task-irrelevant stimulus feature can be attentionally filtered out, (2) that during nonconscious processing only separated stimulus features can be attended, and (3) that during conscious processing the conjunction of stimulus features comprising an object can be attended. Furthermore, the results indicate that at the nonconscious level stimuli are processed at an individual-feature level, while at the conscious level the stimuli can additionally be processed at a whole-object level.