The structuralist view of mathematical objects

This paper is based on lectures given to meetings of the Society for Exact Philosophy in Toronto, May 17, 1985, and of the Association for Symbolic Logic in Washington, DC, December 29, 1985. Some of the material had been presented in lectures at Dartmouth College in 1981 and at the University of Padua in 1983. I am indebted to comments from all four audiences, and also to correspondence with Michael Resnik and especially W. W. Tait. This paper was written while I was at Columbia University, to which I and it owe much. Support of the John Simon Guggenheim Memorial Foundation is gratefully acknowledged.     

Limbic networks and associative learning: II. Entorhinal contributions to spontaneous alternation, passive avoidance, and taste aversion learning

The hippocampus plays an important role in learning and memory, but the precise nature of that involvement remains uncertain. Transection of the perforant path, a primary input pathway to the hippocampus, has been shown to produce changes in reaction to novelty and acquisition of active avoidance; the nature and magnitude of these changes vary with lateral or medial perforant path damage. In a series of experiments on adult rats, the role of these pathways in spontaneous alternation, exploration, acquisition and extinction of conditioned responses, passive avoidance, and conditioned taste aversion was investigated. Lateral transection reduced exploration while medial transection facilitated acquisition of an active avoidance response; no effects were observed on any other measure. Results are discussed in terms of what perforant path damage might reveal regarding the interactions of the hippocampus with other brain regions.     

Preparing direct service staff to teach people with severe disabilities: A comprehensive evalution of an effective and acceptable training program

In light of the continuing need for residential, direct service staff to be able to teach people with severe disabilities, we comprehensively evaluated a program to train staff in behavioral teaching strategies. The program was developed and evaluated with attention given to recent concerns in the staff management literature regarding shortcomings with staff training research. The training program, involving a maximum of four, 2-hr classroom instruction sessions and three in vivo observation and feedback sessions, was evaluated in four studies. In Study 1, the program was shown to improve verbal skills of 13 direct service staff regarding behavioral teaching principles and terminology. In Study 2, the program was demonstrated to improve performance based teaching skills of nine staff and four staff supervisors. In Study 3, the program was shown to result in improvements in adaptive skills of three clients with severe disabilities when direct care staff used their newly acquired teaching skills with the clients. In Study 4, the training program was shown to be well received among 17 staff trainees, although the trainees were more accepting of some program components than others. Results of the studies are discussed in regard to the importance of agencies providing effective and acceptable staff training programs. Future research areas also are noted, focusing on the need to determine, and minimize where possible, the amount of time required to conduct successful staff training.     

The bonnie baby: experimentally manipulated temperament affects perceived cuteness and motivation to view infant faces

Attractive individuals are perceived as having various positive personality qualities. Positive personality qualities can in turn increase perceived attractiveness. However, the developmental origins of the link between attractiveness and personality are not understood. This is important because infant attractiveness (‘cuteness’) elicits caregiving from adults, and infant personality (‘temperament’) shapes caregiving behaviour. While research suggests that adults have more positive attitudes towards cuter infants, it is not known whether positive infant temperament can increase the perception of infant cuteness. We investigated the impact of experimentally established infant temperament on adults' perception of cuteness and desire to view individual faces. Ataseline, adults rated the cuteness of, and keypressed to view, images of unfamiliar infants with neutral facial expressions. Training required adults to learn about an infant's ‘temperament’, through repeated pairing of the neutral infant face with positive or negative facial expressions and vocalizations. Adults then re‐rated the original neutral infant faces. Post‐training, there were significant changes from baseline: infants who were mostly happy were perceived as cuter and adults expended greater effort to view them. Infants who were mostly sad were not perceived as cuter and adults expended less effort to view them. Our results suggest that temperament has clear consequences for how adults perceive ‘bonnie’ babies. Perception of infant cuteness is not based on physical facial features alone, and is modifiable through experience.     

Can There be A Priori Causal Models of Natural Selection?

I argue that Colin Cheyne and Charles Pigden's recent attempt to find truthmakers for negative truths fails. Though Cheyne and Pigden are correct in their treatment of some of the truths they set out to find truthmakers for (such as ‘There is no hippopotamus in S223’ and ‘Theatetus is not flying’) they over-generalize when they apply the same treatment to ‘There are no unicorns’. In my view, this difficulty is ineliminable: not every truth has a truthmaker.     

The Intersection of Mutual Partner Violence and Substance Use Among Urban Gays,Lesbians, and Bisexuals

Intimate partner violence among gays and lesbians has gained increased attention in recent years. The present study assessed mutual partner violence within a gay, lesbian, bisexual (GLB) community sample to explore how mutual partner violence relates to the use of psychoactive substances. The results suggest that individuals engaging in mutual partner violence are more likely to report the use of numerous drugs than other subjects. However, this finding holds more consistently among men. The results also indicate that the exchange of violence is more significant for substance use than the particular type of violence involved. The authors suggest that minority stress may be an underlying mechanism of both substance use and partner violence and may contribute to the intersection of these deviant phenomena in the GLB community.