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Brain, Vol. 111, No. 2, 267-280, 1988
© 1988 Oxford University Press

research-article

ORIENTING OF VISUAL ATTENTION IN PROGRESSIVE SUPRANUCLEAR PALSY

ROBERT D. RAFAL1,, MICHAEL I. POSNER2, JOSEPH H. FRIEDMAN1, ALBRECHT W. INHOFF3 and EMILY BERNSTEIN1

1Division of Neurology, Roger Williams General Hospital and Brown University Providence, RI 2Department of Neurology and Neurological Surgery, Washington University St. Louis, MO 3Department of Psychology, University of New Hampshire Durham, NH, USA

Correspondence to: Correspondence to: Dr Robert Rafal, Division of Neurology, Roger Williams General Hospital, 825 Cha Avenue, Providence, RI 02908, USA

Orienting of visual attention was studied in 8 patients with progressive supranuclear palsy (PSP) and 8 parkinsonian control subjects. While maintaining fixation on the centre of a visual display, subjects made simple reaction time (RT) key press responses on detecting visual targets which appeared above, below, to the left or right, equidistant from fixation. On each trial the target was preceded by a preparatory cue, either a peripheral luminance change or a central arrow, to summon attention to one of the four locations. The orienting of attention was measured as a facilitation in detection RI at the cued location. For the parkinsonian controls, this facilitation was equal for horizontal and vertical directions, whereas for both types of cues, PSP patients were slower moving attention in the vertical than in the horizontal plane. Midbrain retinotectal pathways are important not only for controlling eye movements, but also for orienting attention.

Received January 5, 1987. Revised June 23, 1987. Accepted July 3, 1987.


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