Infant crying: Acoustics,perception and communication

This paper first reviews briefly the literature on the acoustics of infant cry sounds and then presents two empirical studies on the perception of cry and noncry sounds in their social-communicative context. Acoustic analysis of cry sounds has undergone dramatic changes in the last 35 years, including the introduction of more than a hundred different acoustic measures. The study of cry acoustics, however, remains largely focused on neonates who have various medical problems or are at risk for developmental delays. Relatively little is known about how cry sounds and cry perception change developmentally, or about how they compare with noncry sounds. The data presented here support the notion that both auditory and visual information are important in caregivers' interpretations of infant sounds in naturalistic contexts. When only auditory information is available (Study 1), cry sounds become generally more recognizable from 3 to 12 months of age; perception of noncry sounds, however, generally does not change over age. When auditory and visual information contradict each other (Study 2), adults tend to perform at chance levels, with a few interesting exceptions. It is suggested that broadening studies of acoustic analysis and perception to include both cry and noncry sounds should increase our understanding of the development of communication in infancy. Finally, we suggest that examining the cry in its developmental context holds great possibility for delineating the factors that underlie adults' responses to crying.     

Are Machines Gender Neutral? Gender-Stereotypic Responses to Computers With Voices

This study tested whether computers embedded with the most minimal gender cues will evoke gender-based stereotypic responses. Using an experimental paradigm (N = 40) that involved computers with voice output, the study tested 3 gender-based stereotypes under conditions in which all suggestions of gender were removed, with the sole exception of vocal cues. In all 3 cases, gender-stereotypic responses were obtained. Because the experimental manipulation involved no deception regarding the source of the voices. this study presents evidence that the tendency to gender stereotype is extremely powerful, extending even to stereotyping of machines.     

Influence of Maternal Depressive Symptoms on Ratings of Childhood Behavior

This study uses information collected on two occasions from a probability sample of families with 5- to 12-year-old children (N = 1151) participating in a general population study in 1983 and follow-up in 1987. It evaluated the importance of maternal bias in the assessment of child behavior by comparing the relative strengths of association between maternal depression and childhood behavior and between maternal depression and mother reporting errors. Conduct problems and hyperactivity were measured as latent criterion variables constructed from mother, teacher, and youth (aged 12 to 16 years) ratings and their associations with maternal depression were modeled using covariance structure analysis. The analyses revealed that maternal depression was associated significantly with conduct problems ( = .35) and hyperactivity ( = .38) among 5- to 7-years-olds in 1983 but not 4 years later in 1987. None of the associations between maternal depression and mother reporting errors were significant. Among 8- to 12-year-olds in 1983, maternal depression was associated significantly not only with conduct problems ( = .17) and hyperactivity ( = .15) but also with mother rating errors of these behaviors ( = .13 and .17, respectively). Four years later in 1987 when this cohort was 12 to 16 years old, the only significant association was between maternal depression and conduct disorder ( = .25). Although evidence exists for associations between maternal depressed mood and mother rating errors, there also appears to be a substantive association between maternal depression and childhood behavior.     

High school student employment in social context: adolescents' perceptions of the role of part-time work

The majority of middle-class high school students now work at part-time jobs during the academic year. During in-depth interviews, 35 seniors at a predominantly middle-class high school were asked to relate their jobs, or their decisions not to work, to the social contexts of employment. Attitudes toward the workplace and interpretations of the work ethic were analyzed within these contexts in order to examine the role of part-time employment in their lives. The findings of this study suggest that a negative stereotype of the high school student-worker is not justified. Instead, part-time work upholds a variety of interpretations of the work ethic within the framework of normative middle-class values. Future studies are needed to relate part-time work among adolescents to social and economic as well as developmental perspectives.     

Buffalo Creek Survivors in the Second Decade: Comparison with Unexposed and Nonlitigant Groups1

This study investigated the second-decade effects of the Buffalo Creek dam collapse and flood that occurred in West Virginia in 1972. One hundred twenty-one survivors who had participated in an earlier lawsuit against the coal company that built the collapsed dam were compared to 78 nonlitigant survivors on self-reported symptoms, clinical ratings, and diagnoses. A nonexposed sample from a geographically and culturally similar neighborhood was investigated as well. Findings showed no differences between the litigant and nonlitigant survivor groups. The survivor groups together showed higher rates of anxiety, depression, and hostility symptoms and diagnoses than the nonexposed sample. The findings were discussed in the context of the nature of the traumatic event, social and cultural influences on recovery, and the constellation of symptoms which differentiated the groups.     

Spatial summation of chemical irritation and itch produced by topical application of capsaicin

The effect of increasing the total area of stimulation on the sensations of irritation produced by topical application of capsaicin was studied in two experiments. In the first experiment, stimulus area was varied by changing the size of filter paper disks on which capsaicin was delivered to the skin of the forearm. Subjects rated the intensity and quality of the cutaneous sensations over a 15-min period. Increasing stimulus area by a factor of 15 resulted in a relatively modest increase in the peak perceived intensity of irritation, a shortening of the latency to the onset of irritation, and shifts in the frequency of reports of sensations of itching and stinging/pricking. However, itch was the most frequently reported sensation regardless of stimulus size. In Experiment 2, stimulus area was manipulated by varying the number of stimuli applied to the skin. Despite a smaller difference in total stimulus areas (9-fold vs. 15-fold), the difference in perceived irritation was more pronounced than it was in Experiment 1 and reached statistical significance. It is therefore concluded that spatial summation does occur in the afferent system or systems responsible for the perception of capsaicin on the skin. This result is consistent with previous reports of summation at the threshold for heat pain and constitutes new information about the spatial integration of pruritic stimulation.     

Is blockade of conditioned flavor aversions by chlorpheniramine the result of state dependency?

Conditioned flavor aversions induced by pairing flavored fluids with ionizing irradiation, lithium chloride, estrogen, or centrifugal rotation have been blocked by prior administration of chlorpheniramine. The blockade may be due to state dependency. This possibility was evaluated in the present experiment, which assigned female Long-Evans rats to a factorial combination of chlorpheniramine (20 mg/kg) vs saline during training, centrifugal rotation (150 rpm for 15 min) vs none as an UCS, and chlorpheniramine vs saline in testing. Rats conditioned with saline and rotation showed strong aversions when tested with either same or chlorpheniramine. Rats conditioned with chlorpheniramine and rotation showed no change during conditioning; when tested with saline they showed no aversion, and when tested with chlorpheniramine they showed no change from conditioning. Rats conditioned with either chlorpheniramine or saline and no rotation showed high fluid intake when tested with saline and reduced fluid intake when tested with chlorpheniramine. The results were interpreted as offering little support for state dependency.