Exogenous covert attention is the automatic allocation of attention to a peripheral location in the visual field in response to the abrupt appearance of salient object, or cue. It improves task performance for stimuli that are subsequently presented near the cued location, increasing contrast sensitivity, acuity, spatial resolution, and speeds information accrual. Exogenous attention also affects subjective appearance, for example, increasing apparent contrast. Here, we extend the investigation of appearance effects to visual dimensions processed in the ventral and dorsal visual streams, whether the effects of attention interact with visual factors known to differ with location in the visual field, and examine the influence of physical cue properties on the magnitude of attentional modulation. The final chapter examines the contribution of exogenous attention to Illusory Line Motion, a phenomenon in which a line that is presented all at once seems to “grow” from the end nearest a dot that has appeared prior to the line.