Verbal Working Memory Differences Between Children and Adults: A Source EEG Analysis

Abstract:
Abstract: This study explores EEG differences between children and young adults during their performance on a Sternberg task. In this task, a memory set of several digits is presented. Afterwards, the subject has to respond to a probe with one button if the probe was in the memory set and with another button if it was not. It is thought that subvocal rehearsal is used to maintain the memory set at the passive store before the presentation of the probe and that the central executive focuses attention on internal processes. We were looking for: a) EEG changes from a prestimulus condition to a task condition, and b) differences between adults and children. Narrow band analyses of the EEG and Variable Resolution Electromagnetic Tomography were calculated. Prefrontal increases of EEG sources at 1.56, 2.34 and 3.12 Hz during rehearsal were observed only in adults, possible related to a lack of maturation and inhibition in children. Activity at 5.46 Hz, which has been related with attentional demands, increased only in children. Adults and children showed a decrease of activity during rehearsal at 9.36 and 10.14 Hz. It is concluded that EEG specific frequencies may be linked to specific cognitive processes. Partially supported by Grant IN20998.