Learning phonetic categories by tracking movements

We explore in this study how infants may derive phonetic categories from adult input that are highly variable. Neural networks in the form of self-organizing maps (SOMs; ) were used to simulate unsupervised learning of Mandarin tones. In Simulation 1, we trained the SOMs with syllable-sized continuous F(0) contours, produced by multiple speakers in connected speech, and with the corresponding velocity profiles (D1). No attempt was made to reduce the large amount of variability in the input or to add to the input any abstract features such as height and slope of the F(0) contours. In the testing phase, reasonably high categorization rate was achieved with F(0) profiles, but D1 profiles yielded almost perfect categorization of the four tones. Close inspection of the learned prototypical D1 profile clusters revealed that they had effectively eliminated surface variability and directly reflected articulatory movements toward the underlying targets of the four tones as proposed by . Additional simulations indicated that a further learning step was possible through which D1 prototypes with one-to-one correspondence to the tones were derived from the prototype clusters learned in Simulation 1. Implications of these findings for theories of language acquisition, speech perception and speech production are discussed.     

Influence of feedback modality on sensorimotor adaptation: contribution of visual, kinesthetic, and verbal cues

In 4 studies, the authors tested the contributions of visual, kinesthetic, and verbal knowledge of results to the adaptive control of reaching movements toward visual targets. The same apparatus was used in all experiments, but the procedures differed in the sensory modality of the feedback that participants (N s = 5, 5, 6, and 6, respectively, in Experiments 1, 2, 3, and 4) received about their performances. Using biased visual, proprioceptive, or verbal feedback, the authors introduced a 5 degrees shift in the visuomanual relationship. Results showed no significant difference in the final amount of adaptation to the mismatch: On average, participants adapted to 79% of the perturbation. That finding is consistent with the view that adaptation is a multisensory, highly flexible process whose efficiency does not depend on the sensory channel conveying the error signal.     

Does response interference contribute to face composite effects?

Holistic processing of faces can be measured as a failure of selective attention to one face-half under instructions to ignore the other face-half in a naming or same/different matching task. But is interference from the irrelevant half due to response interference rather than to holistic processing? Here, participants learned to name two faces “Fred” and two “Bob.” At test, composites were created from top and bottom halves of different learned faces or of a novel face, and composites were either aligned or misaligned. Naming was slower when the irrelevant half was from a different face as opposed to the same face, regardless of whether it was associated with the same name, a different name, or no name, suggesting holistic processing. Interference was eliminated when composite halves were misaligned. These results suggest that, unlike Stroop effects, composite effects are not due to response interference.     

Attachment,self-esteem,and psychomotor development in extremely premature children at preschool age

The aim of the study was to evaluate concomitantly self-esteem and model of attachment to the mother in extremely premature (24–28 weeks of gestation) and full-term children, in relation to the child's variables (neonatal condition, gender, cognitive development) and family variables (family adversity, socioeconomic status). Forty-two extremely premature and 27 fullterm children were assessed at 5 years 9 months. For the premature children, neonatal status and developmental quotient (DQ) at 18 months were also obtained. Premature and fullterm children did not differ in attachment and self-esteem categories. For all subjects, IQ at 5 years 9 months differed significantly across self-esteem categories. Seventy percent of premature children who showed a decrease in IQ from 18 months to 5 years 9 months had a negative self-esteem. In the premature group, DQ at 18 months was lower for the children that were categorized at 5 years 9 months with nonsecure attachment to the mother. Attachment appeared sensitive to early neuromotor impairments, and self-esteem to the developmental level at the time of the evaluation.     

Knowledge, Attitudes, and Beliefs of Arab-American Women Regarding Inherited Cancer Risk

The increasing incidence of breast cancer in the Arab world, coupled with a relatively early age of onset, raises concern for the presence of hereditary risk factors in this population. However, due to potential structural and cultural barriers, Arab Americans make up the smallest percentage of individuals tested for Hereditary Breast and Ovarian Cancer Syndrome in the United States. The objectives of this qualitative pilot focus group of 13 Arab-American women were to explore attitudes, knowledge and beliefs regarding hereditary breast cancer in the Arab-American community in metropolitan Detroit, identify barriers that would prevent women from seeking hereditary cancer screening/testing and determine who women would talk to about inherited cancer. Results indicated that cultural beliefs and personal experiences with cancer influenced the women’s perspectives on hereditary cancer risk. A high level of secrecy about cancer within Arab-American families was present, which may prevent accurate risk assessment and referral for genetic services. Other identified barriers that may influence hereditary risk assessment included stigma, fears and misconceptions of cancer. While these barriers were present, participants also expressed a strong need for education and tailored cancer risk information for their community.     

HIV risk after release from prison: a pilot case-control study in Canada,France, Ivory Coast and South Africa

This study aimed to assess HIV knowledge, risk perception and risk behaviour of ex-offenders at risk of new infection and to compare them with the general population. A case-control interview study was conducted with conveniently sampled ex-offenders and persons with no history of incarceration in four countries (Canada, France, Ivory Coast, South Africa). The total sample included 232 participants with a mean age of 33.9 years (SD=9.8 years). Results indicate various high HIV risk behaviours including multiple sexual partners, irregular sexual partner, and commercial sexual partner. Other risk factors were unprotected sex at last intercourse with a regular partner, with an irregular partner and with a commercial sexual partner. A history of incarceration did not differentiate risk for infection. Younger age, coming from the Ivory Coast, and higher HIV risk perception were found to be associated with HIV risk behaviour. Prevention efforts should focus on education, promotion of safe sex and substance abuse treatment.     

professional lapses: occupational deviance and neutralization techniques in veterinary medical practice

This study explores the techniques veterinarians use to neutralize ethically legally problematic lapses in the performance of their professional duties. Data were collected during a five-year period via ethnographic fieldwork and in-depth interviews with veterinarians in a Southern state. Though the veterinarians in this study do not question the validity of the rules in the dominant normative system, they do question the applicability of those rules to their roles in certain circumstances. Through the use of various neutralization techniques, these veterinarians make possible behaviors that outsiders to their circumstances might question on legal or ethical grounds.