Knowledge,society, power,and the promise of epistemological externalism

This paper has two aims. The first is to criticize epistemological externalism in a way different from most other criticisms. Most criticisms claim externalism fails because it does not adequately explicate ordinary notions of knowledge and justification. Such criticisms are often unhelpful to the externalist because he may not even intend his theory to be such an explication. The criticism presented here avoids this difficulty. The other aim, achieved en route to this criticism, is to explode a dogma of contemporary epistemology — that the primary end of epistemic endeavors is truth — and to bring to light the many other important goals there are for such endeavors in addition to truth. Several of these goals pertain to the power of knowledge in social contexts. The criticism ultimately made of externalism is that externalist knowledge is defective because it fails to achieve these extra-verific goals of epistemic endeavors.     

Adolescents' perceptions of friends' and parents' attitudes to sex and sexual risk-taking

This study investigated the association between adolescents' perceptions of parental and peer attitudes towards sexuality and AIDS precautions, and the risky sexual behaviours of 1008 sexually active, heterosexual undergraduate students aged 17-20 years. Students were asked to rate the extent to which their mothers, fathers and friends would agree or disagree with 16 statements reflecting support of the adolescent engaging in sexual behaviour and using sexual precautions, including precautions against AIDS. The adolescents also indicated whether they were sexually active and their level of condom use in both ‘regular’ (or steady) and ‘casual’ relationships. Results indicated that adolescents perceived their parents as non-liberal in their sexual attitudes and relatively unlikely to discuss sex or precautions with them. Parents were viewed as more accepting of their sons' sexual behaviours than of their daughters'. Adolescents believed that peers were more likely to discuss sexuality and precautions than parents, and were more liberal in their sexual attitudes. Adolescent sexual risk-taking was related to the perceived attitudes of significant others in ways which varied across gender and type of relationship. Implications for interventions are discussed.     

Choice and multiple reinforcers

Pigeons chose between equivalent two-component mixed and multiple terminal-link schedules of reinforcement in the concurrent-chains procedure. The pigeons preferred the multiple schedule over the mixed when the components of the compound schedules were differentiated in terms of density of reinforcement, but the pigeons were indifferent when the components were differentiated in terms of number of reinforcers per cycle. Taken together, these results indicate that a local variable, the interval to the first reinforcer, but not a molar variable, the number of reinforcers, was sufficient to differentiate the components and thereby evoke preference.     

Cognitive styles in the development of medical careers

Recent research has shown that academic choice and achievement may be partly a function of the student's standing on the field-dependence-independence cognitive-style dimension. The results of two longitudinal studies suggest that information about field dependence-independence may be of value for student guidance in the medical setting. The first, a study of college undergraduates who early expressed an interest in medicine, showed that these cognitive styles play a discernible role in determining who will eventually enter medical school. The second, a study of medical students, showed that field-dependent and field-independent students subsequently tend to choose different medical specialties. These results are consistent with cognitive-style theory, which proposes that field-independent people will choose vocations that require cognitive restructuring skills, whereas field-dependent people will choose vocations that require greater social-interpersonal involvement.     

Reality orientation with psychogeriatric patients

To date, all empirical studies of Reality Orientation have been carried out as part of a ward or group programme in which, in addition to the orientation procedure, patients have been exposed to a variety of other physical and social activities. It is argued that the efficacy of providing information about time, place and person alone, and its generalization to other forms of behaviour, remain unknown. Results of three single case studies suggest that providing such information can increase orientation and that generalization to other forms of behaviour does occur.     

The dispositional shift in attribution over time

Two experiments examined the effect of time on causal attributions. In Experiment I, subjects who described themselves into a tape recorder assumed more personal responsibility for their behavior after 3 weeks' time than others who explained their behavior immediately after its occurrence. In Experiment II, actor-subjects took part in a getting acquainted conversation and explained their behavior more dispositionally and less situationally after 3 weeks' time than they had initially, while observer-subjects experienced no change over time. Results were interpreted in terms of an altered self-perspective in memory and the diminished salience of situational details over time.     

Children at risk for delinquency: A follow-up comparison of aggressive children and children who steal

This study compared the follow-up incidence of court-recorded nonstatus offenses for three groups of adolescent children. These children had been seen 2 to 9 years earlier for problems with aggression in the home (N = 21), for stealing problems (N = 25), or for normative comparisons (N = 14). The results showed that 77% of the children with stealing problems had court-recorded offenses. This was significantly higher than the aggressive children, whose rate did not differ from the normative sample. These findings suggested that young aggressive children were not at risk for adolescent court contact. Instead, it was the young child with identified stealing problems who was highly likely to become an official delinquent. It also appeared that parental reports of stealing events constituted a predictive measure of later criminal acts.     

Tune recognition with reduced pitch and interval information

Twenty subjects were tested on their ability to recognize simple tunes from which rhythm information had been removed. Only the first phrase of each tune was presented. The purpose of the experiment was (a) to determine whether stimuli containing only high harmonics can evoke a sense of musical pitch, and (b) to provide a set of data in normal subjects with which the performance of deaf subjects whose auditory nerve is stimulated electrically can be compared. Each subject was tested on five sets of stimuli presented in a counterbalanced order. These stimuli were (I) pulse trains high-pass filtered at 2 kHz, with repetition rates in the range of 100-200 p.p.s.; (2) as in (I) but high-pass filtered at 4 kHz; (3) sinusoids with musical intervals compressed, so that the “octave” was a ratio of I:I·3; (4) sinusoids with the musical intervals expanded, so that the “octave” was a ratio of I:4; (5) sinusoids of a constant frequency in which the normal frequency changes were translated into intensity changes, each semitone being represented by a 3 dB change in level. The results indicate that a pattern of intensity changes does not support tune recognition, and that, although the pitch contour alone allows reasonable performance, subjects do use musical interval information in recognizing tunes. Stimuli containing only high harmonics can provide such interval information, and thus can evoke a sense of musical pitch. Preliminary results from a deaf subject stimulated electrically with an electrode on the surface of the cochlea indicate that such stimulation can also evoke a sense of musical pitch. It is concluded that musical pitch information can be carried in the time-pattern of nerve impulses in the auditory nerve.