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Cerebral Cortex 1995; 5:439-447
© Oxford University Press 1995

research-article

Dissociation of Ophthalmokinetic and Melokinetic Attention in Unilateral Neglect

Edoardo Bisiach1,, Richard Tegnér2, Elisabetta Làdavas3, Maria Luisa Rusconi4, Danica Mijovi5 and Haukur Hjaltason2

1Dipartimento di Psicologia Generate, Università di Padova Padova, Italy, 2Department of Neurology, Karolinska Hospital Stockholm, Sweden, 3Dipartimento di Psicologia, Università di Bologna Bologna, Italy, 4Istituto di Clinica Neurologica, Universita di Milano Milano, Italy, 5Department of Psychology, Harvard University Cambridge, Massachusetts

Address correspondence to Edoardo Bisiach, 22070 Lurago Marlnone (Como), Italy

A line cancellation task was performed by 38 right brain-damaged patients with unilateral neglect under four different conditions: normal and mirror-reversed view, with and without cueing. Two types of unilateral neglect were distinguished by directing ophthalmo- and me-lokinetic components of visuomanual scanning to opposite sides of the stimulus array. In ophthalmokinetic neglect contralesional visual scanning of the stimulus array was defective, while manual scanning was unimpaired. The converse was true of melokinetic neglect Ophthalmo kinetic neglect was predominantly associated with posterior brain damage, while melokinetic neglect was predominantly associated with frontal or subcortical brain damage. In a few instances, cueing visuomanual scanning toward the neglected side of the stimulus array converted ophthalmokinetic into melokinetic neglect and vice versa. The results are held to be indicative of two components of space representation and to provide further evidence of response-driven modulation of perceptual awareness.


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