Abnormal verbal event related potentials in mild cognitive impairment and incipient Alzheimer's disease

Table 2

Correlations between the event related potential (ERP) repetition effects and memory performance

	LPC repetition effect (550–800 ms, Cz)		Global LPC repetition effect (550–800 ms, all sites)
	MCI (n=14)	All (n=28)	MCI (n=14)	All (n=28)
Pearson correlations between ERP repetition effects (mean amplitude of difference between new and repeated items in a 550 to 800 ms latency window for congruous items) and neuropsychological tests of verbal memory.
p < 0.05; *p < 0.01.
CERAD, consortium to establish a registry for Alzheimer's disease; CVLT, California verbal learning test³¹; DRS, dementia rating scale³⁰; LPC, late positive component; MCI, mild cognitive impairment.
CVLT ³¹
List A, total 1–5	0.73**	0.53*	0.68**	0.53**
Short delay – free recall	0.60*	0.51*	0.54*	0.51**
Short delay – cued recall	0.51	0.41*	0.37	0.41*
Long delay – free recall	0.41	0.38*	0.33	0.44*
Long delay – cued recall	0.46	0.35	0.29	0.38*
Discriminatability	0.56*	0.44*	0.50	0.44*

CERAD word list ³²
Immediate recall	0.67*	0.37	0.71*	0.43*
Delayed recall	0.59	0.37	0.65*	0.47*

Other
DRS³⁰ – memory	0.40	0.40*	0.29	0.36
DRS – total	0.05	0.20	0.07	0.29
Age	−0.27	−0.30	−0.35	−0.25
Education	−0.48	−0.16	−0.49	−0.10

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Abnormal verbal event related potentials in mild cognitive impairment and incipient Alzheimer's disease

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