Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/2808

Title

Steady state visually evoked potential (SSVEP) topography during AX version of continuous performance task (AX-CPT): Age related effects

Author(s)

Li, H. W.;  Silberstein, Richard B.

Abstract

We examined the effect of age on SSVEP topography. Twenty-four elderly (mean age 70) and twenty young (mean age 22) subjects performed the AX version of the CPT task and a reference task requiring them to respond to the regular appearance of the target letter E. Letters were presented for 300 ms with an interval of 1500 ms. Brain electrical activity was recorded from 64 scalp sites while a diffuse 13 HZ flicker, superimposed over the visual fields, elicited the SSVEP. Compared to the mean of the reference task, SSVEP amplitude reductions were observed on the appearance of the letter A as well as on the appearance of the target X at prefrontal sites for both groups. By contrast, an SSVEP amplitude increase was shown when the letter A disappeared. Appearance of the target letter X was associated with SSVEP latency reductions at prefrontal sites for both groups. SSVEP latency reductions were observed at left temporal site in the young group. By contrast, smaller SSVEP latency reductions were observed at left and right temporal sites in the elderly group. Our data suggests significant age-related differences in cortical activations for this task.

Publication type

Conference abstract

Research centre

Swinburne University of Technology. Brain Sciences Institute

Source

Australian journal of psychology, Vol. 55 (2003 Supplement), pp. 22-22(1)

Publication year

2003

Keyword(s)

Age;  Psychobiology;  Psychophysiology

Publisher

Taylor & Francis

Format

pp. 22-22(1)

ISSN

0004-9530

Publisher URL

Australian journal of psychology

Peer reviewed