Stimulus generalization: the ordering and spacing of test stimuli

Twenty-four pigeons learned a successive discrimination between 500 mmu (S+) and 574 mmu (S-). When tested in extinction, some birds received stimuli around S+, with no S- presentations. These birds showed a positive peak shift, with maximum responding not at 550 mmu, but displaced to 538 mmu and 544 mmu. Other birds were tested with stimuli around S-, with no S+ presentations. These birds showed a negative shift, with least responding not at 574 mmu, but at 586 mmu. Though the first group was tested around S+ and the second around S-, total responding between groups did not differ. When retested on the other half of the continuum, however, birds that had gone from the S+ half to the S- half responded fewer times than those that had gone from the S- half to the S+ half. In a second experiment, reducing stimulus spacing from 6 mmu to 2 mmu produced flatter gradients and decreased the amount of positive shift. In a third experiment, birds were tested across the whole continuum with stimuli presented in serial order. A sequence from 538 mmu to 586 mmu produced no responding after the first part of the session; a sequence from 586 mmu to 538 mmu produced responding throughout the session.     

Likelihood to rape in college males

This study assessed rape and sexual force proclivities among 159 college men at a small Protestant church-affiliated liberal arts college. No data were collected regarding ethnicity; however, institutional statistics indicate that the population was about 90% European American. There were 69 freshmen, 31 sophomores, 30 juniors, and 29 seniors (mean age = 19.34). Thirty-four percent reported some proclivity to rape or force sex. Participants who reported both proclivities indicated higher rape myth acceptance, offered more justifications for the increasing use of violence against women, were lower in rape empathy, held more gender stereotyped attitudes toward women, and accepted interpersonal violence more than those who reported no proclivities. However, by contrast, these groups did not differ on general emotional empathy.This paper is based on a Senior Honor's Research Project conducted by the first author while an undergraduate. The first author would like to thank Thomas Peterson for his assistance and encouragement during the early stages of the research process and Keith Yanner for his timely statistical suggestions.     

Early child rearing in Japan: Cross-cultural and intra-cultural perspectives

Within the field of cross-cultural developmental psychology, examinations of parenting serve to focus attention on development in the proximal context of the family and the distal context of the culture. Even though Japan is economically in the mainstream of the industrialized Western world, there are many cultural differences between Japan and Western countries; these include differences in cultural values, beliefs about children, parental behaviours and differences in the children themselves. The focus of this special issue is observational studies of early child rearing in Japan; included are cross-cultural comparisons with the United States, Germany and France, as well as studies within Japan. The contexts of the observations reported in this special issue include homes, laboratory playrooms, and day care centres. With intra-cultural and cross-cultural perspectives, an updated view of Japanese child rearing in the early years is presented.     

Generation of speech continua through monaural fusion

A procedure based on monaural fusion has been developed to construct acoustic continua between natural speech sounds, to be used in studies of speech perception. Two speech stimuli of similar temporal structure and different spectral composition are precisely aligned in time and presented simultaneously to the listener. By mixing both stimulus components in varying intensity ratios, a transition from one component to the other can be achieved. Such stimulus continua have several advantages over the synthetic continua commonly used in studies of categorical perception and related phenomena: They are based on real speech stimuli; the endpoint stimuli are unambiguous; and the stimuli are characterized by a well-defined physical variable, the relative intensity of the two components.     

Local dynamic stability of trunk movements during the repetitive lifting of loads

The local dynamic stability of trunk movements was assessed during repetitive lifting using nonlinear Lyapunov analyses. The goal was to assess how varying the load-in-hands affects the neuromuscular control of lumbar spinal stability. Thirty healthy participants (15M, 15F) performed repetitive lifting at 10 cycles per minute for three minutes under two load conditions: zero load and 10% of each participant's maximum back strength. Short- and long-term maximum finite-time Lyapunov exponents (λ(max-s) and λ(max-l)), describing responses to infinitesimally small perturbations, were calculated from the measured trunk kinematics to estimate the local dynamic stability of the system. Kinematic variability was also assessed using mean standard deviations (MeanSD) across cycles. The results of a mixed-design repeated-measures ANOVA showed that increasing the load lifted significantly reduced λ(max-s) (μ(0%-LOAD)=0.379, μ(10%-LOAD)=0.335, p<.001), but not λ(max-l) (μ(0%-LOAD)=0.46E-03, μ(10%-LOAD)=2.41E-03, p=.055) or MeanSD (μ(0%-LOAD)=2.57, μ(10%-LOAD)=2.89, p=.164). There were no between-subject effects of sex, or significant interactions (α<.05). The present findings indicated improved dynamic spinal stability when lifting the heavier load; meaning that as muscular and moment demands increased, so too did participants' abilities to respond to local perturbations. These results support the notion of greater spinal instability during movement with low loads due to decreased muscular demand and trunk stiffness, and should aid in understanding how lifting various loads contributes to occupational low back pain.     

Women in Federal Law Enforcement: The Role of Gender Role Orientations and Sexual Orientation in Mentoring

Women have always been under-represented in United States’ law enforcement relative to the population, but women are successful law enforcement officers who bring important skills to the field. Thus, understanding work experiences and the barriers female law enforcement officers face is critical in retaining and promoting women in the field. However, law enforcement is also a masculine, male-dominated occupation causing even greater occupational stress to women through discrimination, exclusion, and harassment (Kakar 2002). The goal of this study was to analyze the relationships among gender role orientations (masculinity and femininity), sexual orientation, and mentoring for female sworn federal law enforcement officers throughout the United States. It was hypothesized that (1) masculine female officers would receive more mentoring, (2) low femininity would enhance masculinity’s effect, (3) sexual minorities would receive less mentoring, negating the beneficial effects of masculinity when the interaction is taken into account, and last, (4) the 3-way interaction between masculinity, femininity, and sexual orientation would uniquely impact mentoring. In the current sample, masculinity was found to positively relate to career mentoring and role modeling whereas sexual orientation was negatively related to career mentoring. The three-way interaction between masculinity, femininity, and sexual orientation also significantly related to career mentoring and role modeling; implications and future directions are discussed.     

A practitioner's notes on the free-associative method as existential praxis

Freud's pre-1914 texts demonstrate why he consistently asserted that his free-associative method was the sine qua non of his discipline. Prior to 1914, Freud's theorizing was intimately and inextricably connected to his lived experience with the discovery of this method. After 1914, he became more speculative in this thinking and writing; his models of the “mental apparatus” and its functioning drew increasingly on conceptual sources other than his experience with free association. The four fundamental coordinates of his discipline (the methodical disclosure that self-consciousness is repressive, the nonlinear “time of the mind,” the significance of our sensual embodiment or libidinality, and the formation of the repression barrier by the incest taboo) are all closely tied to free-associative experience. By contrast, post-1914 theoretical preoccupations (from object relations to the structural-functional model, and other formulations generated after Freud's life) are comparatively divorced from such experience. These conceptual edifices imply a conventional depiction of the theory–practice relationship, which is radically challenged by free-associative discourse. The notion of praxis is introduced as contesting the prevailing depiction of practice as an application of theory, and as serving to rescue psychoanalysis from the somewhat “sterile debates” over its scientific status and over the relevance of metapsychological speculation to clinical treatment. Against the normative ideology of theory and practice, the lived experience of free-associative discourse, with its potential for change and healing, can only be understood in terms of this notion of praxis, and this justifies Freud's claim to have initiated “a critical new direction in science.”