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Brain, Vol. 118, No. 2, 467-472, 1995
© 1995 Oxford University Press

research-article

Spatial hemineglect in back space

Giuseppe Vallar1,2,, Cecilia Guariglia1,2, Daniele Nico1,2 and Edoardo Bisiach3

1Dipartimento di Psicologia, Università di Roma, ‘La Sapienza’ 2IRCCS Clinica S. Lucia Roma 3Dipartimento di Psicologia, Università di Torino Italia

Correspondence to: Correspondence to: Giuseppe Vallar, MD, Dipartimento di Psicologia, Università, di Roma, ‘La Sapienza’, Via dei Marsi 78, 00185 Roma, Italia

The subjective location of the mid-sagital plane was assessed by a free-field auditory localization task in the front and in the back half-spaces in 11 right brain-damaged patients with spatial hemineglect, 10 right brain-damaged patients without spatial hemineglect, and 11 normal control subjects. In patients with hemineglect the subjective mid-sagital plane was found to be displaced rightwards in both half-spaces. Both patients without hemineglect and controls, in contrast, made a minor error, and showed a greater displacement towards the left side in the back half-space. In four right brain-damaged patients the rightward displacement was confined either to the front, or to the back half-space. This pattern of impairment may be explained by a rightward, ipsilesional, pathological translation of an egocentric coordinate system, rather than by a rotation around the vertical axis of the body.

neuropsychology; spatial hemineglect; front space; back space; auditory localization

Received May 24, 1994. Revised October 25, 1994. Accepted November 28, 1994.


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