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ردیف | عنوان | نوع |
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1 |
Person-identification using familiar-name auditory evoked potentials from frontal EEG electrodes
شناسایی فرد با استفاده از پتانسیل نام-آشنا شنوایی الکترودهای EEG جلو برانگیخته-2021 Electroencephalograph (EEG) based biometric identification has recently gained increased attention of re- searchers. However, state-of-the-art EEG-based biometric identification techniques use large number of EEG electrodes, which poses user inconvenience and consumes longer preparation time for practical applications. This work proposes a novel EEG-based biometric identification technique using auditory evoked potentials (AEPs) acquired from two EEG electrodes. The proposed method employs single-trial familiar-name AEPs extracted from the frontal electrodes Fp1 and F7, which facilitates faster and user-convenient data acquisition. The EEG signals recorded from twenty healthy individuals during four experiment trials are used in this study. Different com- binations of well-known neural network architectures are used for feature extraction and classification. The cascaded combinations of 1D-convolutional neural networks (1D-CNN) with long short-term memory (LSTM) and with gated recurrent unit (GRU) networks gave the person identification accuracies above 99 %. 1D-convolutional, LSTM network achieves the highest person identification accuracy of 99.53 % and a half total error rate (HTER) of 0.24 % using AEP signals from the two frontal electrodes. With the AEP signals from the single electrode Fp1, the same network achieves a person identification accuracy of 96.93 %. The use of familiar-name AEPs from frontal EEG electrodes that facilitates user convenient data acquisition with shorter preparation time is the novelty of this work. Keywords: Auditory evoked potential | Biometrics | Deep learning | Electroencephalogram | Familiar-name | Person identification |
مقاله انگلیسی |
2 |
The reduced auditory evoked potential component N1 after repeated stimulation: Refractoriness hypothesis vs: habituation account
کاهش مولفه بالقوه برانگیخته شنوایی N1 پس از تحریک مکرر: فرضیه نسوز در مقابل حساب عادت-2021 Similar to other event-related potential (ERP) components, the amplitude of the auditory evoked N1 depends on the interstimulus interval (ISI). At ISIs > 0.4 s, the amplitude of the N1 increases with longer
ISIs, until it saturates at ISIs around 10 s. This amplitude increase with increasing ISI has been conceptualized as a function of N1 recovery or N1 refractoriness. Habituation (as a simple form of learning)
represents an elaborated, opposing account for such stimulus repetition effects. For passive oddball experiments (stimulation protocols with frequent standards and rare deviants), the two accounts make different predictions. According to the habituation account, the presentation of small deviants should lead to
an increased N1 for subsequent standards (= dishabituation); according to the N1 refractoriness account,
there should be no or just minor effects on the N1. In the current study, we tested these predictions and
compared the ERPs to standards after small deviants and to standards preceded by other standards. We
observed that the ERPs to standards after small deviants were characterized by a small mismatch negativity with an onset latency > 150 ms, but the N1 to standards after deviants did not differ from the N1
to standards preceded by other standards. This negative finding is in line with other previous studies that
were also not able to reveal evidence for N1 dishabituation. Aside from this repeated lack of evidence for
dishabituation, the N1 habituation account is challenged by the finding that the N1 decrease is stronger
for more intense stimuli. Overall, the current and previous findings are more compatible with the N1
refractoriness account, although the mechanisms underlying N1 refractoriness remain to be elucidated.
Knowledge about these mechanisms would also help to understand why N1 deficits in schizophrenia are
more pronounced at longer ISIs.
keywords: عادت | جهت دار | پتانسیل های ناشی از شنوایی | شدت محرک | نگرش ناسازگاری (MMN) | انطباق محرک-مشخصه (SSA) | Habituation | Dishabituation | Auditory evoked potentials | Stimulus intensity | Mismatch negativity (MMN) | Stimulus-specific adaptation (SSA) |
مقاله انگلیسی |