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 27 for “"MMN"”.
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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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Multimodal Networks in Biology
A multimodal network (MMN) is a novel mathematical construct that captures the structure of biological networks, computational network models, and relationships from biological databases. An MMN subsumes the structure of graphs and hypergraphs, either undirected or directed. Formally, an MMN is a …
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Mismatch Negativity as a Marker of Auditory Pattern Separation Integrity 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) adults in a passive …
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An exploration of pre-attentive visual discrimination using event-related potentials
The Mismatch Negativity (MMN) has been characterised as a ‘pre-attentive’ component of an Event-Related Potential (ERP) that is related to discriminatory processes. Although well established in the auditory domain, characteristics of the MMN are less well characterised in the visual domain. The …
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Automatic Processing of Musical and Phonemic Sounds: Differences Between Musicians and Nonmusicians
… 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 most obviously …
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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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Erklärung von Rechtschreibleistungen durch phonologische und auditiv-sensorische Informationsverarbeitungskompetenzen: Eine Untersuchung mit lese-/rechtschreibgestörten Kindern
… hatte zum Ziel, eine zukünftige Nutzbarkeit des MMN-Paradigmas als physiologisches Frühdiagnostikum der Lese-/Rechtschreibschwäche zu prüfen. Zu diesem Zweck wurden Indikatoren der auditiv-sensorischen Verarbeitung (EEG-Paradigma der Mismatch Negativity; MMN) und Indikatoren der phonologischen …
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Cognitive Differentiation of Schizophrenia and Depression
… working memory was designed to avoid confounding MMN with other components. Schizophrenics, depressives, and controls performed a tone discrimination task, in which subjects counted or ignored tones. Evidence of memory abnormalities emerged as a function of diagnosis and stimulus sequence. All …
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Using EEG to investigate premature aging and cognitive decline in adults with Down's Syndrome
… 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 gender-matched TD controls. As …
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Maturation of Speech Discrimination and Attentional Requirements in Late Childhood
… 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 differing attentional …
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Zinc intake-status-health relationships and the impact of multiple micronutrient supplementation on cognitive function in Peruvian pre-school children.
… the assessment of multiple micronutrients (MMN) supplementation and cognitive development in Peruvian children when compared with giving iron supplements alone. These tests were considered to reflect theoretical dimensions of working memory (Nine boxes), and inhibitory control (Day/Night …
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Who is that talking? Function and dysfunction of efference copy and corollary discharge in healthy people and schizophrenic patients
… reacted with large a Mismatch Negativity (MMN). If subjects were notified of the upcoming pitch-shift, however, the MMN was considerably reduced. If subjects were passively listening, predictability did not influence the size of the MMN. Schizophrenic patients did not show differences in …
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Influence of a Nicotinic Treatment on Auditory Sensory Processing in Schizophrenia
… stimuli, as measured by the mismatch negativity (MMN) ERP. Acknowledging the baseline-dependent effects of nicotine, each of the four investigations assessed the role of inter-individual differences in response to the cholinergic treatment by adopting a baseline median-split approach to stratify …
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Brain plasticity in speech training in native English speakers learning mandarin tones
… 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 the non-speech …
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Musical Expertise and rhythm processing
… deviance violation (Mismatch Negativity – MMN and Middle Latency Responses - MLRs), by inserting deviant stimuli in rhythmical (at strong and weak metrical positions) and non-rhythmical structures. Deviant stimuli within rhythmical structures elicited larger MMN compared to non-rhythmical …
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Neurophysiological bases of frequency discrimination in children with Auditory Processing Disorder or Specific Language Impairment
… results were below chance level and the MMN amplitude was smaller in the impaired population. Slight differences between children with APD and children with SLI were also found that might shed light on the controversy regarding the deficits underlying pediatric APD, either a disorder in …
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Utilization of Musculoskeletal Sonography in Detecting Physiologic Changes of the Median Nerve in a Working Animal Model
… used as participants in median mononeuropathy (MMN) research in which they will be exposed to a repetitive pinching task, putting them at risk for MMN. As the subjects move through the working and non-working stages of the study, MSK sonograms are performed longitudinally to allow for …
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Electrophysiological Markers of Sensory Plasticity and Connectomics in Ageing and Mild Cognitive Impairment
… 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 modulation of both forward …
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Understanding language and attention: brain-based model and neurophysiological experiments
… 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, and whether attention …
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Prediction and perception in the multisensory brain: Supramodal and modality-specific mechanisms of sensory predictions across cortical hierarchies
… P3b-like global effects and lower-order MMN-like local effects in the auditory and the somatosensory modality. I will show that cortical representations supporting the global effect are maintained in time in networks shared between the senses. Conversely, cortical activity underpinning …
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