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You searched for +publisher:"Dalhousie University" +contributor:("Dr. Steve Aiken"). Showing records 1 – 3 of 3 total matches.

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Dalhousie University

1. Mulle, Jennifer. In Search of an Electrophysiological Correlate to Between-Channel Modulation Gap Detection.

Degree: MS, School of Human Communication Disorders, 2012, Dalhousie University

Auditory processing disorder (APD) is characterized by deficits in the auditory modality that are not due to a global processing problem or to deficiencies in the peripheral auditory system. Diagnosis of APD is time-consuming and could benefit from an objective test. Temporal processing ability is often impaired in cases of APD, which includes deficits on gap detection tasks. Previous attempts to correlate gap detection thresholds to electrophysiological responses have used the P1-N1-P2 response, mismatch negativity (MMN), and 40 Hz auditory steady-state response (ASSR), but these attempts have not been successful, especially using between-channel gap detection tasks. The current study used a modulation gap detection task and recorded the above responses to supra- and subthreshold gaps and stimuli with no gap. A significant P2 response and a later positive peak distinguished perception of a suprathreshold gap. Improvements over previous studies, the relation to auditory training, and limitations and directions for future research are discussed. Advisors/Committee Members: Dr. Aaron Newman (external-examiner), Dr. Joy Armson (graduate-coordinator), Dr. Dennis Phillips (thesis-reader), Michel Comeau (thesis-reader), Dr. Steve Aiken (thesis-supervisor), Received (ethics-approval), No (manuscripts), No (copyright-release).

Subjects/Keywords: Modulated Gap Detection; Auditory Processing Disorder; Temporal processing; P1N1P2; Between channel gap detection

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APA (6th Edition):

Mulle, J. (2012). In Search of an Electrophysiological Correlate to Between-Channel Modulation Gap Detection. (Masters Thesis). Dalhousie University. Retrieved from http://hdl.handle.net/10222/14586

Chicago Manual of Style (16th Edition):

Mulle, Jennifer. “In Search of an Electrophysiological Correlate to Between-Channel Modulation Gap Detection.” 2012. Masters Thesis, Dalhousie University. Accessed October 24, 2020. http://hdl.handle.net/10222/14586.

MLA Handbook (7th Edition):

Mulle, Jennifer. “In Search of an Electrophysiological Correlate to Between-Channel Modulation Gap Detection.” 2012. Web. 24 Oct 2020.

Vancouver:

Mulle J. In Search of an Electrophysiological Correlate to Between-Channel Modulation Gap Detection. [Internet] [Masters thesis]. Dalhousie University; 2012. [cited 2020 Oct 24]. Available from: http://hdl.handle.net/10222/14586.

Council of Science Editors:

Mulle J. In Search of an Electrophysiological Correlate to Between-Channel Modulation Gap Detection. [Masters Thesis]. Dalhousie University; 2012. Available from: http://hdl.handle.net/10222/14586


Dalhousie University

2. Chiddenton, Kathleen. Examing Listeners' Ability to Perceive Vowel-Inherent Spectral Changes.

Degree: MS, School of Human Communication Disorders, 2013, Dalhousie University

One family of theories regarding vowel perception suggests onset and offset formant-frequencies are important for identification and that the shape of the transitions themselves are not otherwise perceptually important. The present study determined just-noticeable-differences in deviations from linear formant trajectories. Diphthong-like stimuli were manipulated by inserting a point of inflection into the otherwise linear transition. Several parameters were manipulated including vowel duration, location of the inflection point in time, and fundamental frequency. Data from the first experiment indicate that listeners are largely insensitive to deviations from linearity of formant trajectory but that large enough deviations could eventually be detected. The size of these deviations seems dependent on the range of onset-offset formant frequencies. However, a second experiment in which only the first half of stimuli was presented thereby affecting the frequency range of the stimuli, gave different results. Results from these experiments along with several hypotheses are presented. Advisors/Committee Members: Dr. Rob Adamson (external-examiner), Dr. Joy Armson (graduate-coordinator), Dr. Terrance Nearey (thesis-reader), Dr. Steve Aiken (thesis-reader), Dr. Michael Kiefte (thesis-supervisor), Received (ethics-approval), Not Applicable (manuscripts), Not Applicable (copyright-release).

Subjects/Keywords: Vowel-Inherent Spectral Change; vowel perception; formant tracking; VISC

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Chiddenton, K. (2013). Examing Listeners' Ability to Perceive Vowel-Inherent Spectral Changes. (Masters Thesis). Dalhousie University. Retrieved from http://hdl.handle.net/10222/21659

Chicago Manual of Style (16th Edition):

Chiddenton, Kathleen. “Examing Listeners' Ability to Perceive Vowel-Inherent Spectral Changes.” 2013. Masters Thesis, Dalhousie University. Accessed October 24, 2020. http://hdl.handle.net/10222/21659.

MLA Handbook (7th Edition):

Chiddenton, Kathleen. “Examing Listeners' Ability to Perceive Vowel-Inherent Spectral Changes.” 2013. Web. 24 Oct 2020.

Vancouver:

Chiddenton K. Examing Listeners' Ability to Perceive Vowel-Inherent Spectral Changes. [Internet] [Masters thesis]. Dalhousie University; 2013. [cited 2020 Oct 24]. Available from: http://hdl.handle.net/10222/21659.

Council of Science Editors:

Chiddenton K. Examing Listeners' Ability to Perceive Vowel-Inherent Spectral Changes. [Masters Thesis]. Dalhousie University; 2013. Available from: http://hdl.handle.net/10222/21659


Dalhousie University

3. Sharma, Ishika. DEVISING A MODIFIED FLANKER TASK TO OBTAIN EVENT RELATED BRAIN POTENTIALS FOR THE ASSESSMENT OF ATTENTION.

Degree: MS, School of Physiotherapy, 2014, Dalhousie University

Electrophysiological indices of attention provide insight into the neural processes underlying attention. These indices include the P300 and its sub-components, the P3a and P3b, which are event related potentials (ERPs) reflecting stimulus evaluation and response execution. Paradigms used to elicit these ERPs have limitations, and thus alternative paradigms are needed. Purpose: To test the ability of an alternative paradigm, the Flanker task, for eliciting the P300 and its sub-components. Methods: Mixed and single modality Flanker tasks were used to elicit ERPs from 40 non-disabled adult participants. Results were compared to ERPs obtained from a standard paradigm, the oddball task. Results: Neither the P300 or its sub-components were observed for the three tasks. Alternate ERPs indicative of selective attention and novelty were observed for the Flanker tasks. Conclusion: The modified Flanker tasks elicited ERPs indicative of the neural processes underlying attention, however the ERPs obtained did not correspond to those anticipated. Advisors/Committee Members: Dr. Steve Aiken (external-examiner), Dr. Shaun Boe (graduate-coordinator), Dr. Marilyn MacKay-Lyons (thesis-reader), Dr. Olav Krigolson (thesis-reader), Dr. Shaun Boe (thesis-supervisor), Received (ethics-approval), Not Applicable (manuscripts), Not Applicable (copyright-release).

Subjects/Keywords: Electroencephalography; Attention; Event Related Potentials; P300; N100-P200 complex; N200; Flanker task; Oddball task

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Sharma, I. (2014). DEVISING A MODIFIED FLANKER TASK TO OBTAIN EVENT RELATED BRAIN POTENTIALS FOR THE ASSESSMENT OF ATTENTION. (Masters Thesis). Dalhousie University. Retrieved from http://hdl.handle.net/10222/53972

Chicago Manual of Style (16th Edition):

Sharma, Ishika. “DEVISING A MODIFIED FLANKER TASK TO OBTAIN EVENT RELATED BRAIN POTENTIALS FOR THE ASSESSMENT OF ATTENTION.” 2014. Masters Thesis, Dalhousie University. Accessed October 24, 2020. http://hdl.handle.net/10222/53972.

MLA Handbook (7th Edition):

Sharma, Ishika. “DEVISING A MODIFIED FLANKER TASK TO OBTAIN EVENT RELATED BRAIN POTENTIALS FOR THE ASSESSMENT OF ATTENTION.” 2014. Web. 24 Oct 2020.

Vancouver:

Sharma I. DEVISING A MODIFIED FLANKER TASK TO OBTAIN EVENT RELATED BRAIN POTENTIALS FOR THE ASSESSMENT OF ATTENTION. [Internet] [Masters thesis]. Dalhousie University; 2014. [cited 2020 Oct 24]. Available from: http://hdl.handle.net/10222/53972.

Council of Science Editors:

Sharma I. DEVISING A MODIFIED FLANKER TASK TO OBTAIN EVENT RELATED BRAIN POTENTIALS FOR THE ASSESSMENT OF ATTENTION. [Masters Thesis]. Dalhousie University; 2014. Available from: http://hdl.handle.net/10222/53972

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