||In studying the interaction between the EEG response and language proficiency, most of pervious work address this problem from the prospective of semantic and syntactic processing. The EEG response in listening comprehension test has rarely been investigated.|
With Cz as the reference, this work uses electro-cap to measure 14 channels of EEG signals including channels from frontal (Fp1, Fp2, F3, F4, F7, F8 ), parietal (P3, P4), occipital (O1, O2) and temporal regions (T3, T4, T5, T6). The test subjects include 17 right hand dominant individuals (16 men and 1 woman, age 22-48). Each subject was asked to answer 60 TOEIC listening comprehension test part II questions via our answering interface (programing by LabVIEW). By recording the time instant that the test subjects pressing the answering button, the entire period of every question is divided into before-answering and after answering-periods.
The aim of this work is to distinguish the EEG responses associated with correctly and incorrectly answered questions by using features of mean correlation (MC), zero crossing numbers (ZCN) and power spectrum density (PSD) of the EEG signals obtained from the before-answering, after answering and entire periods.
Our findings can be summarized as follows: (1) Correct-answered EEG response has significantly larger (p-value < 0.05) σ band (12-15 Hz) relative PSD than that of the incorrectly-answered EEG response in channels Fp1, Fp2, F3, F4, F7, F8, P3 for the before-answering and entire periods. (2) The change of θband (12-15 Hz) relative PSD from the before-answering to the after-answering periods are significantly larger for the incorrectly-answered EEG response. (3) The number of zero crossing points of the frontal and temporal regions tend to decrease after falsely answering the questions. However, the difference is not statistically significant. (4) Many pairs of EEG channels exhibit moderate (r > 0.5) or higher Mean Correlation. Among the tested channels, the T5 channel has the largest Mean Correlation values.