Mark A. Hasegawa-Johnson

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Stuttering is a developmental speech disorder that occurs in 5% of children with spontaneous remission in approximately 70% of cases. Previous imaging studies in adults with persistent stuttering found left white matter deficiencies and reversed right-left asymmetries compared to fluent controls. We hypothesized that similar differences might be present(More)
Individuals with sensorineural hearing loss (SNHL) are prescribed hearing aids and/or a cochlear implant, based on their pure-tone threshold and speech perception scores. Although these assistive listening devices do help these individuals communicate in quiet surroundings, many still have difficulty understanding speech in noisy environments. Especially,(More)
Spoken language user interface can dramatically speed up computer use. Unfortunately, if the speech user interface gets in the way too often, the user turns it off. Users are unforgiving: a technology that impairs productivity just once may never get a second chance. In order to give the user interface a fighting chance, why not give it a certain amount of(More)
The increasing popularity of real-world recommender systems produces data continuously and rapidly, and it becomes more realistic to study recommender systems under streaming scenarios. Data streams present distinct properties such as temporally ordered, continuous and high-velocity, which poses tremendous challenges to traditional recommender systems. In(More)
Data of many problems in real-world systems such as link prediction and one-class recommendation share common characteristics. First, data are in the form of positive unlabeled (PU) measurements (e.g. Twitter "following", Facebook "like", etc.) that do not provide negative information, which can be naturally represented as networks. Second, in the era of(More)
Many past studies have been conducted on speech/music discrimination due to the potential applications for broadcast and other media; however, it remains possible to expand the experimental scope to include samples of speech with varying amounts of background music. This paper focuses on the development and evaluation of two measures of the ratio between(More)
F0 analysis-by-synthesis methods are used in order to test the hypothesis that the pitch contour in the alteration segment of disfluency tends to mimic the pitch contour in the reparandum segment of that disfluency. Reparandum-Alteration pairs selected by transcribers as having perceptually similar F0 contours were compared to arbitrarily selected fluent(More)
Both chirp (or sweep) and maximum length sequence (MLS) excitation signals are used to obtain measurements of the head-related transfer function (HRTF) for the Knowles electronic manikin for acoustic research (KEMAR), resulting in remarkably low relative error between the two measurement methods. Due to the low relative error, it is asserted that applying(More)
Audiovisual event detection aims to identify semantically defined events that reveal human activities. Most previous literature focused on restricted highlight events, and depended on highly ad-hoc detectors for these events. This research emphasizes generalizable robust modeling of single-microphone audio cues and/or single-camera visual cues for the(More)
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