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Mismatch Negativity Event Related Potential Elicited By Speech Stimuli In Geriatric Patients, Dana Lynn Pierce
Mismatch Negativity Event Related Potential Elicited By Speech Stimuli In Geriatric Patients, Dana Lynn Pierce
Theses and Dissertations
Hearing loss, as a result of old age, has been linked to a decline in speech perception despite the use of additional listening devices. Even though the relationship between hearing loss and decreased speech perception has been well established, research in this area has often focused on the behavioral aspects of language and not on the functionality of the brain itself. In the present study, the mismatch negativity, an event related potential, was examined in order to determine the differences in speech perception between young adult participants, geriatric normal hearing participants, and geriatric hearing-impaired participants. It was hypothesized that a …
Neurophysiological Correlates Of The Critical Bandwidth In The Human Auditory System, Grace Ann Bentley
Neurophysiological Correlates Of The Critical Bandwidth In The Human Auditory System, Grace Ann Bentley
Theses and Dissertations
The critical bandwidth (CBW) is an auditory phenomenon that has been used to study various aspects of auditory processing, including auditory masking, complex tone processing, and loudness perception. Although the psychoacoustic aspects of the CBW have been well studied, the underlying neurophysiology of the CBW has not been as thoroughly examined. The current study examined the neurophysiology of the CBW in young adults, as well as loudness perception in response to the CBW. Auditory stimuli consisting of complex tones of varying bandwidths were presented to 12 individuals (6 male and 6 female, ages 18-26 years). Complex tones were presented around …
Source Localization In Cross Modality Matching Of Brightness And Loudness Of Young Adults, Tawnya Nadine Coates
Source Localization In Cross Modality Matching Of Brightness And Loudness Of Young Adults, Tawnya Nadine Coates
Theses and Dissertations
Cross modality matching is a magnitude matching procedure, developed to study the relationships between sensory modalities. Auditory and visual sensory integration can be examined through cross modality matching of brightness and loudness. Brightness and loudness are natural correlates of one another as they both represent the parameter of intensity for their respective sensory modalities. Past studies have demonstrated that typical individuals tend to match brighter lights with louder sounds and dimmer lights with softer sounds. The current study utilized a modified cross modality matching procedure, combined with electroencephalography (EEG) data, to examine the cortical response to sensory integration. It was …
Brain Imaging Of Event Related Potentials In Children With Language Impairment, Hillary Ann Benton
Brain Imaging Of Event Related Potentials In Children With Language Impairment, Hillary Ann Benton
Theses and Dissertations
Event related potentials (ERPs) may provide specific information about how particular aspects of language are processed by the brain over time. This study investigated the electrophysiology of language processing in two children with language impairment (LI) when compared to five typically developing children. The N400, P600, and the early left anterior negativity (ELAN) were analyzed after participants listened to linguistically correct, syntactically incorrect, and semantically incorrect sentences. Participants were instructed to indicate whether the sentences were correct or incorrect. Latency and amplitude of the ERP components were compared between the two groups of participants and sentence types. Results from the …
Event Related Potentials Of Syntactic Language Processing In Two Children With Specific Language Impairment: A Case Study, Melissa Ann Willes
Event Related Potentials Of Syntactic Language Processing In Two Children With Specific Language Impairment: A Case Study, Melissa Ann Willes
Theses and Dissertations
This study examined the electrophysiological activity of two children with Specific Language Impairment (SLI) and two aged-matched peers while listening to syntactically correct sentences versus syntactically incorrect sentences. The study specifically analyzed the N400 and P600 components. The N400 component is a negative wave occurring approximately 400 ms post-stimulus and is elicited by semantically incorrect stimuli. The P600 component is a positivity that occurs approximately 600 ms post-stimulus and reflects processing of syntactically incorrect stimuli. The participants in the study included a 7-year-old child and a 9-year-old child with SLI and two age-matched peers with typically developing language. Each participant …
Event Related Potentials: A Study Of The Processing Of Gapping Structures In Adolescents, Michelle Miller Nishida
Event Related Potentials: A Study Of The Processing Of Gapping Structures In Adolescents, Michelle Miller Nishida
Theses and Dissertations
Many questions remain unanswered regarding the intricacies of the human brain, especially with regard to the complexities of language processing. One essential component of human sentence processing is the ability to detect, decipher, and recover from errors in the interpretation of both verbal and written language. This process of repair of ungrammatical sentences and revision or reinterpretation of ambiguous sentences has been studied extensively in recent years. A variety of tools have been developed, including the use of event-related potentials (ERPs) in order to assess how language is processed and developed, and to help better identify the nature of these …