Figure 2.

Results of the neuropsychological study aimed at investigating the relative contribution of SPL and TPJ to top-down and bottom-up orienting. (A) Lesion overlaps (purple minimal overlap; red maximal overlap) for patients grouped by behavioral deficits in top-down attentional orienting, labeled the SPL group (top panel); and patients grouped by behavioral deficits in bottom-up orienting, labeled the TPJ group (lower panel). (B) Behavioral performance on the top-down task summarized with a “Top-down Index” which quantifies differences between spatial top-down shifts made from left to right and vice versa. Controls and the TPJ lesioned group show similar efficiencies in executing spatial shifts, while patients with SPL lesions show decreased efficiency. Group control and individual patient data (labeled with patient initials) are plotted on the abscissa. (C) “Capture index” is a measure of bottom-up attention and quantifies the extent to which task-irrelevant distractors capture attention away from the task. Controls and the SPL lesioned group show similar capture values, such that both groups are captured by the task-irrelevant distractors. TPJ lesioned group show much reduced capture index (failure to be captured). Note that patients were placed in the SPL or TPJ group based on behavior, rather than based on the lesion, thus note the consistency with which patients end up in the corresponding group.