Diane Kewley-port | Indiana University (original) (raw)

Papers by Diane Kewley-port

Attention Perception & Psychophysics, Jul 1, 1984

The Journal of the Acoustical Society of America, 2001

This study examined the effects of mild-to-moderate sloping sensorineural hearing loss on vowel d... more This study examined the effects of mild-to-moderate sloping sensorineural hearing loss on vowel discrimination and identification. Five young, hearing-impaired (YHI) adults listened to vowel stimuli in three conditions: (a) at a conversational level with flat frequency response; and in two gain conditions, (b) at a high-sound level with flat frequency response; and (c) with frequency shaped gain according to the subject’s hearing loss. Listeners discriminated changes in the synthetic vowels /I ε e æ ʌ/ when F1 or F2 varied, and later identified the five vowels in a closed-set task. The results indicated that neither gain condition restored performance to that of young, normal-hearing listeners and that the potential upward spread of masking in condition (b) did not affect performance. Young, normal-hearing (YNH) listeners were age matched to YHI subjects. Hearing thresholds for the YNH listener of each YHI–YNH pair were precisely matched to those of the YHI listener by masking with ...

Journal of the Acoustical Society of America, May 25, 2012

Journal of the Acoustical Society of America, Apr 1, 1984

Journal of the Acoustical Society of America, Feb 1, 2006

Attention, perception & psychophysics, 2010

Journal of the Acoustical Society of America, Apr 1, 2010

Attention, perception & psychophysics, May 1, 2009

Journal of the Acoustical Society of America, May 1, 1983

Attention, perception & psychophysics, Dec 20, 2012

Journal of the Acoustical Society of America, Jul 1, 1973

Quarterly Journal of Experimental Psychology, 1974

Standing and Dodwell (1972) reported that a contoured target stimulus which is only poorly identi... more Standing and Dodwell (1972) reported that a contoured target stimulus which is only poorly identified when exposed briefly against a steady background field can be identified accurately if the field is terminated shortly after target offset. This observation was confirmed and, in addition, it was shown that target identification is enhanced when the field is initiated shortly before target onset. Furthermore, it was demonstrated that a continuous background field is not essential for either effect. It was argued that these “retroactive” and “proactive” enhancements of target identification were due to a complex interaction among forward, backward, and simultaneous masking.

The Journal of the Acoustical Society of America, 2007

Aging generally has a negative impact on temporal processing. Four experiments using vowel sequen... more Aging generally has a negative impact on temporal processing. Four experiments using vowel sequences are presented from a large series of temporal processing studies of age-related changes across three sensory modalities. These four experiments used adaptive tracking to determine the smallest temporal difference between the onsets of vowels (SOA) that preserved identification of either the vowel sequences or ear presented. Vowels in the four words (pit, pet, pot, put) from a male speaker were processed using STRAIGHT to have the same length (70 ms) and F0 (100 Hz) and equated for rms level. Young (N=40) and elderly (N=40; 60–79 years) adults identified the vowels in isolation with better than 90% accuracy. Preliminary analyses based on 40% of the data are summarized here. Baseline performance by young listeners in the monaural, two-vowel sequence task was SOA=20 ms. For the other three conditions (monaural four-vowel sequences, dichotic two-vowel sequences, and dichotic two-vowel se...

Journal of the Acoustical Society of America, Apr 1, 1991

Journal of the Acoustical Society of America, Apr 1, 2005

Journal of the Acoustical Society of America, Apr 1, 1985

Previous research has demonstrated that the discrimination of stop consonants differing in VOT is... more Previous research has demonstrated that the discrimination of stop consonants differing in VOT is categorical (nonmonotonic) in high-uncertainty tasks such as the ABX paradigm, but may become less categorical as the level of task uncertainty is decreased. In particular, Sachs and Grant [J. Acoust. Soc. Am. Suppl. 1 60, S91 (1976)] reported that the perception of a /ga-ka/ continuum became monotonic after considerable training in a low-uncertainty, same-different task. Four subjects participated in a replication of the Sachs and Grant experiments with a /ba-pa/ continuum. Results were similar to Sachs and Grants's and indicated that in the lowest uncertainty task VOT discrimination followed Weber's Law. An analogous set of experiments were carried out for somewhat simpler stimuli, following Miller et al. [J. Acoust. Soc. Am. 60, 410–417 (1976)]. These stimuli were digitally generated as a bandpassed noise followed by a buzz. The duration of the noise preceding the buzz varied in the same manner as the VOT continuum. Results were essentially the same as those obtained for VOT, demonstrating that the locus of categorical boundaries on these continua cannot be determined by local maxima in auditory acuity, [Supported by NINCDS and AFOSR.]

Journal of the Acoustical Society of America, Oct 29, 2003

This study examined the effects of mild-to-moderate sensorineural hearing loss on vowel perceptio... more This study examined the effects of mild-to-moderate sensorineural hearing loss on vowel perception abilities of young, hearing-impaired (YHI) adults. Stimuli were presented at a low conversational level with a flat frequency response (approximately 60 dB SPL), and in two gain conditions: (a) high level gain with a flat frequency response (95 dB SPL), and (b) frequency-specific gain shaped according to each listener’s hearing loss (designed to simulate the frequency response provided by a linear hearing aid to an input signal of 60 dB SPL). Listeners discriminated changes in the vowels /ɪ e ɛ ʌ æ/ when F1 or F2 varied, and later categorized the vowels. YHI listeners performed better in the two gain conditions than in the conversational level condition. Performances in the two gain conditions were similar, suggesting that upward spread of masking was not seen at these signal levels for these tasks. Results were compared with those from a group of elderly, hearing-impaired (EHI) listeners, reported in Coughlin, Kewley-Port, and Humes [J. Acoust. Soc. Am. 104, 3597–3607 (1998)]. Comparisons revealed no significant differences between the EHI and YHI groups, suggesting that hearing impairment, not age, is the primary contributor to decreased vowel perception in these listeners.

Journal of the Acoustical Society of America, May 1, 2004

Journal of the Acoustical Society of America, Dec 1, 1988

Pastore [J. Acoust. Soc. Am. 84, XXX–XXX (1988)] has written a lengthy response to Kewley-Port, W... more Pastore [J. Acoust. Soc. Am. 84, XXX–XXX (1988)] has written a lengthy response to Kewley-Port, Watson, and Foyle [J. Acoust. Soc. Am. 83, 1133–1145 (1988)]. In this reply to Pastore’s letter, several of his arguments are addressed, and new data are reported which support the conclusion of the original article. That conclusion is, basically, that the temporal acuity of the auditory system does not appear to be the origin of categorical perception of speech or nonspeech sounds differing in temporal onsets.