Discrimination of intensity differences on format transitions in and out of syllable context

The Ss were presented pairs of stimuli, /bae/s, /ae/s, or isolated transitions from /bae/s, which differed in the initial 60 msec of the signals by 0, 7.5, or 9 dB. In the syllable context, the intensity differences were discriminated essentially at chance; in both the vowel and isolated transition conditions, the intensity differences were discriminated essentially perfectly. This outcome suggests that after the acoustic features of a stop-consonant/vowel syllable have been recorded into a phonetic representation, the acoustic information is relatively inaccessible for recall from auditory short-term memory.     

Auditory evoked potential correlates of speech sound discrimination

An electrophysiological correlate of the discrimination of stop consonants drawn from within and across phonetic categories was investigated by an auditory evoked response (AER) technique. Ss were presented a string of stimuli from the phonetic category [ba] (the standard stimulus) and were asked to detect the occurrence of a stimulus from the same phonetic category (within-category shift), or the occurrence of a stimulus from a different phonetic category [pa] (across-category shift). Both the across- and within-category shift stimuli differed equally from the standard stimulus in the time of onset of the first formant and in the amount of aspiration in the second and third formants. The NIP2 response of the AER was larger to the across-category shift than to the within-category shift. The within-category shift did not differ from a no-shift control. These findings suggest (1) that the AER can reflect the relative discriminability of stop consonants drawn from the same or different phonetic categories in a manner similar to other behavioral measures; (2) that the detailed acoustic representation of stop consonants is transformed into a categorized phonetic representation within 200 msec after stimulus onset.     

Cardiac indices of infant speech perception: Orienting and burst discrimination

The present study investigated burst cue discrimination in 3- to 4-month-old infants with the natural speech stimuli [bu] and [gu]. The experimental stimuli consisted of either a [bu] or a [gu] burst attached to the formants of the [bu], such that the sole difference between the two stimuli was the initial burst cue. Infants were tested using a cardiac orienting response (OR) paradigm which consisted of 20 tokens of one stimulus (e.g. [bu]) followed by 20 tokens of the second syllable (20/20 paradigm). An OR to the stimulus change revealed that young infants can discriminate burst cue differences in speech stimuli. Discussion of the results focused on asymmetries observed in the data and the relationship of these findings to our previous failure to demonstrate burst discrimination using the habituation/dishabituation cardiac measure generally employed with older infants.     

Vowel and consonant recognition with the aid of a multichannel cochlear implant

In this report we review the vowel and consonant recognition ability of patients who use a multichannel cochlear implant and who achieve relatively good word identification scores. The results suggest that vowel recognition is accomplished by good resolution of the frequency of the first formant (F1) combined with poor resolution of the frequency of the second formant (F2). The results also suggest that consonant recognition is accomplished (1) by using information from the amplitude envelope, including periodicity/aperiodicity, as cues to manner and voicing, (2) by using F1 as an aid to the identification of manner and voicing, and (3) by using information from cochlear place of stimulation to provide a very crude indication of the shape of the frequency spectrum above 1kHz.     

Mary Cover Jones: Feminine as Asset

Mary Cover Jones has played many roles during her career as a psychologist—researcher, professor, wife of the eminent psychologist Harold E. Jones, and friend to some of the great names in the field such as Erik Erikson and Nevitt Sanford. Included in the paper is a discussion of three of her primary areas of research—the case study of Peter which provided a preview of behavior modification, evidence from longitudinal studies regarding the problems of early and late maturing, and work on personality antecedents in problem drinkers. In addition, her part in the establishment of the major longitudinal studies at the University of California is reported. Finally, her successful application of traditionally feminine strengths to these many professional undertakings is discussed.     

The Relationship of Sex, Sex Role, and Mental Health

Mental health differences due to sex, sex-role identification, and sex-role attitudes were investigated using 109 undergraduate students. Females reported higher levels of depression and anxiety. Both males and females with more liberal scores on the Attitudes Toward Women Scale scored higher on the Well-Being Scale of the California Psychological Inventory. No differences due to androgyny were found.     

Verbal, perceptual and intellectual factors associated with reading achievement in adolescents with cerebral palsy

31 adolescents with cerebral palsy were administered measures of verbal production, speech perception, nonverbal auditory perception, visuospatial perception and verbal intelligence as well as measures of reading recognition and reading comprehension. Nonverbal auditory perception and verbal intelligence were most highly correlated with both reading measures despite the fact that most subjects were most severely impaired in visuospatial perception.