Abstract
This study was designed to classify and determine t he Event-Related Potentials (ERPs) signal pattern o f normal children on visual response. Thirty-eight ch ildren aged between 10 to 12 years old were subject ed to a two-phase computer-based assessment while their working memory activity was recorded using a NeurofaxEEG 9200 machine. For children, it is anticipated t hat some information can be lost when there is too much information given at any one time due to limited me mory capacity and this is a type of memory impairment. Based on the visual stimulus responses, EEG signal were recorded and captured from channel location at Fz. This paper explains the extraction of raw EEG signa ls into grand mean ERPs signal which to determine t he pattern of signal developed. The ERPs concerning la tency and amplitude variability of the P300 component was evaluated. The analysis was based on Discrete Wavelet Transform (DWT) algorithm and focused on alpha rhythm. Results indicated that the Daubechies wavel et at a decomposition level of 4 (db4) was the most suitable wavelet for pre-processing raw EEG signal of working memory. A significant increase of latenc y was detected in children aged 10 to 12 years old at cha nnel Fz (frontal midline) when the visual stimuli b ecame more difficult. For amplitude variability, the girl s gave higher amplitude at Phase 1. These results s upported the concept of increased cognitive memory in childr en.
Highlights
Our working memory is a temporary memory that stores and manipulates information in our brains
It is anticipated that some information can be lost when there is too much information given at any one time due to limited memory capacity and this is a type of memory impairment
This study has focused on alpha range because the Event-Related Potentials (ERPs) are within the low frequency bands
Summary
Our working memory is a temporary memory that stores and manipulates information in our brains. Its recent researches include differentiating between what our brains develop and perceive as simple or complex spans. Simple span tasks are about unloading primary and secondary memory such as words and letters (Pritzer and Blankenburg, 2011). More attention is given to complex span events in children. Human are able to store about 1 to 10 items for a short period of time in the active state for about 0 to 60 sec, depending on the individual cognitive memory capacity (Potagas et al, 2011). Impairments in working memory may cause an individual to forget verbal instructions, face difficulties in solving simple problems and confuse oneself while multitasking
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