Seeing and imagining the "same" objects in unilateral neglect.

Dissociations between perceptual and imaginal neglect are typically investigated by using very different tasks (e.g. visual target cancellation vs. place descriptions). Here we report patients' performance on imaginal and perceptual tasks which shared identical stimuli and procedure, except for the modality of stimulus presentation. In different tasks, participants either saw towns/regions on a map of France or heard their names, and pressed one of two keys according to the stimulus location (left or right of Paris). Neglect patients as a group were less accurate for left-sided stimuli in both modalities, but on single-case analysis only one patient with perceptual neglect had asymmetrical imaginal accuracy. These results confirmed that imaginal neglect is relatively rare, and is usually associated with perceptual neglect. Perceptual neglect resulted more frequent and severe than imaginal neglect, also when assessed using strictly comparable tests, consistent with the exogenous orienting bias typically observed in these patients.