Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 29 for “"Mismatch Negativity"”.
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Mismatch Negativity as a Marker of Auditory Pattern Separation Integrity in Aging
… in aging? This study examined how the mismatch negativity (MMN), an electrophysiological marker of change detection and encoding, relates to age differences in mnemonic discrimination. The MMN was recorded from 33 young (18–32 years, 18 females) and 30 older (55–86 years, 14 females) …
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Generation of mismatch negativity in a sample of treatment-resistant schizophrenia patients
Mismatch negativity (MMN) was recorded in thirteen treatment-resistant schizophrenic patients and age- and gender-matched fourteen healthy controls. The MMN was obtained by subtracting the standard from the deviant event-related potential (ERP) brain wave. Subjects responded to infrequent visual …
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Electrophysiological and behavioural measures of central auditory processing in adult cochlear implant users
… (MLR), obligatory N1-P2 cortical potentials, mismatch negativity and P3a auditory evoked potential were recorded. Speech perception was evaluated using tests from "The Minimum Speech Test Battery for Adult Cochlear Implant Users". Frequency discrimination was measured using a two-alternative …
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The effect of Alzheimer's disease on cortical microcircuits
… magnetoencephalography evoked responses from a mismatch negativity paradigm to the severity and progression of Alzheimer’s disease and to employ dynamic causal modelling to (ii) reproduce these neurophysiological responses, (iii) test hypotheses of cellular-level disease effects in people living …
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Temporal and spatial aspects of hearing as revealed by auditory evoked potentials
… the generators producing the late AEPs and the mismatch negativity components. Influences of sound elevation are only weakly and not systematically reflected in the potentials and the response amplitudes to externalized stimuli are not higher than those to non-spatial stimuli. To this end, the …
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Towards a neurophysiological correlate of the precedence effect: from psychoacoustics to electroencephalography
… effect, is represented in the amplitude of the mismatch negativity, a component of the CAEP. This supports the hypothesis that the precedence effect is not generated at the brainstem level, but rather is a cortical phenomenon related to (pre-)cognitive processing. By combining two means of …
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Neural Indicator of Altered Mismatch Detection Predicts Atypical Cognitive-Perceptual Experiences in Psychotic Psychopathology
… is evident in early (N1), mid-latency(P2/N2/mismatch negativity), and late (P3) neural responses. The influence of attention on AAP, and how temporal stages of AAP are associated with phenomenology of psychotic psychopathology are not well understood. Methods: We used a directed attention …
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Neurophysiologic and Behavioral Measures of Phonetic Perception in Adult Second Language Speakers of Spanish
… listeners. Electrophysiological data using the mismatch negativity revealed that the both L2 Spanish and native Spanish listeners perceived a distinction between stimuli in the stimulus pairs 20 ms earlier than English only listeners. These results support the theory that underlying …
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Brain plasticity in speech training in native English speakers learning mandarin tones
… of the Mandarin lexical tones. Analysis of the Mismatch Negativity (MMN) responses in the ERP data revealed increased amplitude and decreased latency for pre-attentive processing of across-category discrimination as a result of training. There were also laterality changes in the MMN responses to …
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Erklärung von Rechtschreibleistungen durch phonologische und auditiv-sensorische Informationsverarbeitungskompetenzen: Eine Untersuchung mit lese-/rechtschreibgestörten Kindern
… Verarbeitung (EEG-Paradigma der Mismatch Negativity; MMN) und Indikatoren der phonologischen Verarbeitung (kognitionspsychologische Konstrukte: phonologisches Arbeitsgedächtnis, Abruf aus dem Langzeitgedächtnis, phonologische Bewusstheit) bei lese-/rechtschreibschwachen Kindern …
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Automatic Processing of Musical and Phonemic Sounds: Differences Between Musicians and Nonmusicians
… EEG was recorded during each condition. The mismatch negativity (MMN) was identified by subtracting ERPs to standard auditory stimuli from ERPs to deviant auditory stimuli for each of the four qualitatively different conditions. Superior preattentive auditory processing in musicians was found …
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The Interaction of Intensity and Deviance on Auditory Event-Related Potentials: Findings Using Principal Component Analysis (PCA) of Current Source Densities (CSDs)
<p>Mismatch negativity (MMN) studies provide insights into the brain's ability to perceive and/or detect deviations from established sensory patterns. Clinical studies investigating the loudness-dependency of auditory evoked potential (LDAEP) have shown a relationship between the intensity of an …
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Electrophysiological Markers of Sensory Plasticity and Connectomics in Ageing and Mild Cognitive Impairment
… an index of Hebbian plasticity, and the roving Mismatch Negativity (MMN), as an index of Predictive Coding. In addressing aim 1, the modulation of effective connectivity induced by these paradigms was compared. Consistent with their respective learning models, the MMN was associated with a …
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Prediction of templates in the auditory cortex.
In this study variation of human auditory evoked mismatch field amplitudes in response to complex tones as a function of the removal in single partials in the onset period was investigated. It was determined: 1-A single frequency elimination in a sound stimulus plays a significant role in human …
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Using EEG to investigate premature aging and cognitive decline in adults with Down's Syndrome
… the following event-related potentials (ERPs): mismatch negativity (MMN) and P300 (P3a and P3b), were chosen for exploration with cross-sectional and longitudinal investigations. The thesis begins by exploring how the ERPs differ for a cross-section of 36 adults with DS and 39 age- and …
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Mechanisms of timing: an integrative theoretical approach
… (Level I) was assessed using a duration-based mismatch negativity paradigm (dMMN), which fundamentally requires minimal cognitive resources. Behavioral timing (Level II) introduces the role of attention and working memory to accurately determine the amount of elapsed time (verbal estimation) or …
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Maturation of Speech Discrimination and Attentional Requirements in Late Childhood
… (ERP) measures, with a particular focus on mismatch negativity (MMN) - a developmentally-sensitive index of automatic speech discrimination.</p> <p>The first experiment focused on children ages 6.0-11.9 years old, comparing the MMN responses elicited by English vowel contrasts under …
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Investigating psychosis in Prader-Willi syndrome: developing cognitive, electrophysiological and neuroimaging approaches
… with mUPD. Contrary to what was expected, the mismatch negativity response to the oddball paradigm was not different between mUPD and controls but was significantly earlier in the deletion group. This could indicate a chronic fight or flight state having the potential to disrupt …
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Understanding language and attention: brain-based model and neurophysiological experiments
… on the other, the more recent results on the Mismatch Negativity (MMN, latency 100-250ms), an early automatic brain response elicited under distraction which is larger to words than to pseudowords. We asked what the mechanisms underlying these differential neurophysiological responses may be, …
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