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Biomedical subjects

N J Lass

Publications and source records attributed to N J Lass.

At least 37 records · Page 2Linked to original sources
PubMed1986

Variable speech control vs Varispeech: does newer mean better?

Normal-hearing volunteers (N:30, aged 19-28 yrs) yielded intelligibility scores for W-22 word lists and CID sentences at 40 db re each S's SRT, and judgments on a 7-pt scale ("very pleasant"----"very unpleasant") for Sentence 3 of Fairbanks' "Rainbow Passage". Normal and time-altered speeds (60%: compression; 140%: expansion) were compared between the widely-used but obsolescent Lexicon Varispeech (VSp) unit vs the commercially available Variable Speech Control Model A-7 which incorporates a time-sampling technique similar to the VSp. With both VSp and VSC, intelligibility was nearly perfect at all three speeds, and thus both appear equally suitable for intelligibility studies, but at the 60% and 140% speeds the signal clarity was significantly preferable for the VSp system (p less than .01 in both cases), by .6 of a scale interval at 60% and 1.8 interval at 140%. Furthermore, the VSC does not operate beyond the 60-140% range, as occasionally may be desirable in research on the effects of time alteration on speech reception.

Adolescent↗
PubMed1984

Listeners' discrimination of real and human-imitated animal sounds.

To determine if listeners can accurately distinguish between real and human-imitated animal sounds, a total of 165 recorded sounds (55 real and 110 human-imitated) of cats, cows, dogs, pigs, and sheep were randomly arranged on a master tape and presented to 30 listeners for discriminative judgments. Results indicate that, in general, listeners can accurately discriminate real from human-imitated animal sounds. Suggestions for future research are discussed.

Animals↗
PubMed1984

A comparative study of children's performance on the Illinois Test of Psycholinguistic Abilities and the Token Test.

The Illinois Test of Psycholinguistic Abilities (ITPA) and the Token Test (TT) were administered to 24 5- and 6-yr-olds. There was a significant positive correlation between performance on the TT and only 2 of the 12 subtests of the ITPA: Grammatic Closure (p less than .05) and Sound Blending (p less than .05). TT scores did not correlate significantly with any of the ITPA subtests at the representational level of language. These findings support the conclusion of Williams and Marks (J. Speech Hear. Res., 1972, 15, 323ff) on the lack of validity of tests of receptive auditory comprehension which employ simultaneous presentation of stimuli through visual and auditory modalities and the arbitrary selection of one of the channels (auditory) as the primary process being measured. Implications for clinical use of the Peabody Picture Vocabulary Test and the TT were discussed and suggestions made for future research.

Child↗
PubMed1984

Current clinical practices in the assessment of velopharyngeal closure.

A questionnaire designed to survey methods of assessing velopharyngeal closure and the extent of training and experience in velopharyngeal assessment was distributed to 256 randomly selected American Cleft Palate Association members. There was a 50% response rate and 94% of those responding were associated with cleft palate teams. Findings included the following: (1) the respondents rely primarily upon the use of listener judgments of spontaneous speech samples, phonological analysis, and lateral view cine/videofluoroscopy; (2) the majority spend thirty minutes or less on an average diagnostic evaluation of velopharyngeal competency; and (3) 45% feel that they are inadequately trained in assessment of velopharyngeal closure.

Cleft Palate↗
PubMed1983

Listeners' identification of human-imitated animal sounds.

To determine whether listeners can accurately identify human-imitated animal sounds, 20 speakers (10 females and 10 males) recorded their imitations of cows, cats, dogs, pigs, and sheep. These recordings were randomly arranged on a master tape and presented to 30 judges for identification. Analysis indicates that listeners can accurately identify various human-imitated animal sounds. Implications and suggestions for future research are discussed.

Adult↗
PubMed1982

Effect of vocal disguise on estimations of speakers' heights and weights.

The purpose of this investigation was to determine the effect of speakers' attempts to disguise their voices on listeners' accuracy in judgments of height and weight. A total of six sentences were recorded by 26 speakers, 13 females and 13 males, under five conditions: in a normal manner (control condition) and in a manner in which they attempted to sound much taller and much shorter, as well as much heavier and much lighter than they actually were. Five master tapes were constructed, a control tape and four disguise tapes. Each tape contained a total of 156 sentences arranged in random order. A total of 40 judges, 20 in the height-estimation experiment and 20 in the weight-estimation experiment, participated in three sessions, one for each of the three master tapes (one control and two disguise tapes) in each experiment. They were asked to judge the height and weight of the speaker of each sentence and, using a seven-point confidence rating scale, to indicate the over-all confidence in their judgments at the end of each session. Although a majority of speakers yielded height and weight estimates consistent with the intended disguise conditions, the differences in listeners' estimates among all conditions were relatively small. Moreover, differences between speakers' actual heights and weights and listeners' height and weight estimates in the normal (control) condition were also relatively small. Implications of these findings and suggestions for future research are discussed.

Adult↗
PubMed1982

Effect of vocal disguise on judgments of speakers' sex and race.

To determine the effect of speakers' attempts to disguise their voices on listeners' accuracy in judgments of speakers' sex and race, 26 speakers, 13 women and 13 men, recorded six sentences under three conditions: (a) in a normal manner, (b) in a manner in which they attempted to sound like a member of the opposite sex, and (c) in a manner in which they attempted to sound like a member of the black race. Three master tapes were constructed, one for each of the three conditions. A total of 40 judges, 20 in an experiment on sex identification and 20 in one on race identification, participated in two sessions, one for each of two tapes (control and disguise) in each experiment. In each session they were asked to judge the sex or race of the speaker of each sentence and, using a seven-point confidence rating scale, to indicate the over-all confidence in their judgments at the end of each session. Analysis indicated that, although listeners' accuracy for sex and race identification was greater under the control than disguised conditions for the majority of speakers, the differences between the two conditions were relatively small. Implications of these findings and suggestions for future research are discussed.

Adult↗
PubMed1982

Effect of vocal disguise on estimations of speakers' ages.

To determine the effect of speakers' attempts to disguise their voices on listeners' accuracy in age judgments, 26 speakers, 13 females and 13 males, recorded six sentences under three conditions: (a) in a normal manner, actually were, and (c) in a manner in which they attempted to sound much older than they actually were. Three master tapes were constructed, one for each of the three conditions. A total of 20 judges, 10 females and 10 males, participated in three sessions, one for each of the three master tapes. In each session they were asked to judge the age of the speaker of each sentence and, using a seven-point confidence rating scale, to indicate the over-all confidence in their judgments at the end of each session. Although a majority of speakers yielded age estimates consistent with the conditions of intended disguise, the differences in listeners' estimates among all three conditions were relatively small. Moreover, differences between speakers' actual ages and listeners' age estimates in the control condition were also small. Implications of the findings and suggestions for research are discussed.

Adolescent↗
PubMed1982

Listeners' identification of environmental sounds.

To determine if listeners can accurately identify various environmental sounds, a total of 40 sounds, including animal, inanimate, musical, and human sounds, were recorded, randomly arranged on a master tape, and presented to 30 judges for identification. Analysis indicated that, in general, listeners can accurately identify environmental sounds. However, their accuracy was not equal for all four classes of sounds investigated: human sounds yielded the highest accuracy, followed by musical and inanimate sounds, and animal sounds were least accurately identified. Implications and suggestions for research are discussed.

Auditory Perception↗
PubMed1981

Effect of prior exposure to stimulus material on identification of speakers' sex, height, and weight.

The purpose of this series of experiments was to determine the effect of prior exposure to taped stimulus material on listeners' judgments of speakers' sex, height, and weight. Two series of listening experiments, one concerned with sex identification and one with height and weight identification, were conducted. Results indicate that prior exposure to stimulus material improved the accuracy of listeners' judgments of speakers' sex, height, and weight. However, they also indicate that it is not necessary to receive prior exposure to the complete set of stimuli to achieve accurate judgments. Prior exposure to the stimulus material improved listeners' confidence in their estimates of height and weight but not in their judgments of speakers' sex.

Adult↗
PubMed1981

Effect of listeners' comprehension on judgments of speakers' height and weight.

To determine the effect of listener's comprehension on speakers' height and weight judgments, a total of 40 speakers, 20 Americans (10 females and 10 males) and 20 non-Americans representing various nationalities (10 females and 10 males), recorded a standard prose passage. A total of three master tapes were constructed to represent the three experimental conditions: (1) American speakers' readings in English, (2) foreign speakers' reading in their native languages, and (3) foreign speakers' readings in English. A total of 30 judges, 15 females and 15 males, participated in three sessions, one for each of the three master tapes, and were asked to provide direct estimations of the height and weight of each speaker from the tapes. Listeners' comprehension does not appear to play a major role in height and weight judgmental tasks.

Adult↗
PubMed1980

The use of time-expanded speech in judgments of hypernasality.

Twenty-five samples of various degrees of hypernasal speech were time altered (expanded) to 0%, 125%, 175% of the original time. Inexperienced and experienced student clinicians rated the magnitude of hypernasality and degree of confidence of ratings for each sample in each condition. The results indicate significant differences in ratings of hypernasality for the expansion conditions for both groups. Experienced clinicians showed less variability and higher mean ratings than inexperienced clinicians.

Adolescent↗
PubMed1979

Correlational analysis of speakers' heights, weights, and temporal speech features.

Correlation coefficients on height, weight, and temporal features were computed separately for 15 female and 15 male speakers. With only one exception, speakers' heights and weights were not significantly correlated with their temporal characteristics. Implications of these findings and suggestions for future research are discussed.

Adolescent↗
PubMed1979

Information and experience with cleft palate: students, parents, professionals.

More than 1,200 students, parents, and professionals completed a questionnaire designed to assess knowledge and experience with cleft palate. Professionals knew more about cleft palate and had had more experience with it than either parents or students. Parents, however, knew more about cleft palate and had had more experience with it than had students. There was also an apparent relationship between knowledge and experience because those who knew more about cleft palate had also had more experience and training. The results reemphasize the need for pre-professional and continuing-education programs.

Cleft Lip↗