Table 2.

No group differences were found on the neurocognitive tests carried out to assess reaction times, working memory, and long term memory. Mean ± SD values are given for the nr of correct responses on each test, as described in Methods, except for the reaction times, which are given in milliseconds. Some test data were lost due to computer failures; actual degrees of freedom are given for each analysis.

	Patients	Controls
Reaction time
Simple reaction task	375.2±100.2	371.5±93.2	F[1,51]=0.02; p=0.89
Complex reaction task	407.5±64.6	396.3±62.8	F[1,52]=0.42; p=0.52
Working memory
Backward digit span, no corr. seq.	2.9±1.7	3.6±1.4	F[1,54]=3.15; p=0.08
Backward digit span, no tot. seq.	6.5±2.0	7.0±1.7	F[1,54]=1.09; p=0.30
Long term memory
Picture recognition	27.5±8.5	28.0±7.2	F[1,52]=0.06; p=0.80
Delayed word recognition	18.1±2.4	18.4±1.3	F[1,53]=0.25; p=0.62
Visual Cues	36.0±4.2	36.7±3.8	F[1,53]=0.43; p=0.52