scholarly journals Analyzing event related potentials using adaptive filter

2015 ◽  
Vol 18 (2) ◽  
pp. 123-130
Author(s):  
Huong Thi Minh Nguyen ◽  
Khai Quoc Le ◽  
Hai Chi Nguyen ◽  
Tri Minh Ngo ◽  
Linh Quang Huynh
Keyword(s):  
Electrical Response ◽  
Event Related Potentials ◽  
Lms Algorithm ◽  
Calculation Algorithm ◽  
Average Value ◽  
Heart Motion ◽  
Related Potentials ◽  
Adaptive Noise ◽  
External Stimuli ◽  
The Waves

ERPs (Event Related Potentials) are EEG signals which are directly measured from cortical electrical response to external stimuli such as feelings, sensual or cognitive events. The evaluation of the amplitude and latency of the ERP wave has important significance in evaluating neurological reflex. However, the ERP wave amplitude is small compared with the EEG wave, and considerably affected by the noise such as eyes, muscles, heart motion etc. In this paper, datasets are collected from ERPLAB and journals provided available datasets with the stimulus of sound and light. Using adaptive noise cancellation (ANC) combined with LMS algorithm the waves P300 of ERP were detected and separated. The algorithm was evaluated by the ratio SNR and average value. Results were compared with other published tools such as P300 calculation algorithm of ERPLAB softwar.

Paradigms for Recording Cognitive Brain Electrical Activity

2001 ◽  
Vol 40 (03) ◽  
pp. 184-189
Author(s):  
H. G. McAllister ◽  
R. Howard ◽  
L. Hong Neo ◽  
P. J. McCullagh
Keyword(s):  
Cognitive Processing ◽  
Brain Function ◽  
Event Related Potentials ◽  
Multimedia Technology ◽  
Auditory Oddball ◽  
Related Potentials ◽  
Pictures And Words ◽  
Comparative Processing ◽  
External Stimuli ◽  
Abnormal Brain

Abstract:Human event-related potentials reflect cognitive processing, and are normally elicited by external events, such as acoustic sounds or visual stimuli. As such they provide an opportunity to study normal and abnormal brain function noninvasively, at sub-second resolution. Advances in multimedia technology permit specialists in informatics and neuropsychology to co-operate in the design and implementation of paradigms, which influence ERP components. The paper illustrates the progression from standard paradigms such as the auditory oddball, which can be used to study memory update through to contingent negative variation and three condition, visual paradigms which can be used to study cognitive and emotional responses. Data from a study investigating the comparative processing of target pictures and words illustrate how external stimuli influence the later cognitive potentials.

A Hybrid Optimization Method OWGWA for EEG/ERP Adaptive Noise Canceller With Controlled Search Space

2020 ◽  
Vol 11 (3) ◽  
pp. 30-48
Author(s):  
Rachana Nagal ◽  
Pradeep Kumar ◽  
Poonam Bansal
Keyword(s):  
Optimization Algorithm ◽  
Signal To Noise Ratio ◽  
Event Related Potentials ◽  
Search Space ◽  
Optimization Method ◽  
Optimization Techniques ◽  
Grey Wolf ◽  
Related Potentials ◽  
Adaptive Noise ◽  
Adaptive Noise Canceller

In this paper, a system for filtering event-related potentials/electroencephalograph is exhibited by adaptive noise canceller through an optimization algorithm, oppositional hybrid whale-grey wolf optimization algorithm (OWGWA). The OWGWA can choose the control parameters of the grey wolf algorithm utilizing whale parameters. To balance out the randomness of optimization strategies another methodology is implemented called controlled search space. Adaptive filter's noise reduction capability has been tested through adding adaptive white Gaussian noise over contaminated EEG signals at different noise levels. The performance of the proposed OWGWA-CSS algorithm is evaluated by signal to noise ratio in dB, mean value, and the relationship between resultant and input ERP. In this work, ANCs are also implemented by utilizing other optimization techniques. In average cases of noisy environment, comparative analysis shows that the proposed OWGWA-CSS technique provides higher SNR value, significantly lower mean and higher correlation as compared to other techniques.

Multisensory processes in the synaesthetic brain — An event-related potential study in multisensory competition situations

2012 ◽  
Vol 25 (0) ◽  
pp. 101
Author(s):  
Janina Neufeld ◽  
Christopher Sinke ◽  
Daniel Wiswede ◽  
Hinderk M. Emrich ◽  
Stefan Bleich ◽  
...  
Keyword(s):  
Multisensory Processing ◽  
Event Related Potentials ◽  
Event Related Potential ◽  
Line Drawings ◽  
Multimodal Processing ◽  
Gun Shot ◽  
Related Potentials ◽  
Distractor Filtering ◽  
External Stimuli ◽  
Multisensory Processes

In synaesthesia certain external stimuli (e.g., music) trigger automatically internally generated sensations (e.g., colour). Results of behavioural investigations indicate that multisensory processing works differently in synaesthetes. However, the reasons for these differences and the underlying neural correlates remain unclear. The aim of the current study was to investigate if synaesthetes show differences in electrophysiological components of multimodal processing. Further we wanted to test synaesthetes for an enhanced distractor filtering ability in multimodal situations. Therefore, line drawings of animals and objects were presented to participants, either with congruent (typical sound for presented picture, e.g., picture of bird together with chirp), incongruent (picture of bird together with gun shot) or without simultaneous auditory stimulation. 14 synaesthetes (auditory–visual and grapheme-colour synaesthetes) and 13 controls participated in the study. We found differences in the event-related potentials between synaesthetes and controls, indicating an altered multisensory processing of bimodal stimuli in synaesthetes in competition situations. These differences were especially found over frontal brain sites. An interaction effect between group (synaesthetes vs. controls) and stimulation (unimodal visual vs. congruent multimodal) could not be detected. Therefore we conclude that multisensory processing works in general similar in synaesthetes and controls and that only specifically integration processes in multisensory competition situations are altered in synaesthetes.

Face and Word Recognition in Patients with Left and Right Hemispheric Lesions: Evidence from Reaction Times and ERPs

2002 ◽  
Vol 13 (1) ◽  
pp. 69-83 ◽  
Author(s):  
Stefan R. Schweinberger ◽  
Thomas Klos ◽  
Werner Sommer
Keyword(s):  
Slow Wave ◽  
Reaction Times ◽  
Memory Search ◽  
Event Related Potentials ◽  
Performance Deficits ◽  
Set Size ◽  
Left Brain ◽  
Related Potentials ◽  
Abstract Words ◽  
Left Brain Damage

Abstract: We recorded reaction times (RTs) and event-related potentials (ERPs) in patients with unilateral lesions during a memory search task. Participants memorized faces or abstract words, which were then recognized among new ones. The RT deficit found in patients with left brain damage (LBD) for words increased with memory set size, suggesting that their problem relates to memory search. In contrast, the RT deficit found in patients with RBD for faces was apparently related to perceptual encoding, a conclusion also supported by their reduced P100 ERP component. A late slow wave (720-1720 ms) was enhanced in patients, particularly to words in patients with LBD, and to faces in patients with RBD. Thus, the slow wave was largest in the conditions with most pronounced performance deficits, suggesting that it reflects deficit-related resource recruitment.

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