Table 1 Neuropsychological performance for the seven subjects with amyotrophic lateral sclerosis who had abnormal findings over a six month period early in their disease course.

Cognitive domain	Subject No
	1	2	7	15	16	17	19
Selective verbal attention							x
Verbal working memory		x					x
Verbal short term memory	x	x	x				x
Verbal learning					x		x
Verbal long term memory					x		x
Visuoperception–object decision	x						x
Visuoperception–visual discrimination
Executive–visual organisation	x						x
Executive–hypothesis generation				x	x	x	x

x: z score ⩾−1 standard deviation.