Disorders of Perception and Performance in a Case of Right-Sided Cerebral Thrombosis

The disorders of perception and performance which accompany cerebral injury have a particular fascination in neurology, in that they cannot always be explained solely in terms of the sensory loss or motor deficit observed. It has been known for some time that in right-handed persons lesions of the right cerebral hemi-sphere involving the fronto-parietal region may produce, in addition to left hemiplegia and left hemianaesthesia, an agnosia, a failure to recognize the left side, or an anosognosia, a failure to recognize disease of the paralysed side. Typical cases have recently been reported by Sandifer (1946) and by Roth (1949). It has also been shown that right parietal lesions may result in a corresponding