Do you see what I see? Testing horses’ ability to recognise real-life objects from 2D computer projections

Animal Cognition - The use of 2-dimensional representations (e.g. photographs or digital images) of real-life physical objects has been an important tool in studies of animal cognition. Horses are...     

Functional equivalence classes in rats: Repeated olfactory discrimination reversals and delayed stimulus probes

The simultaneous matching-to-sample procedures that are widely used to study stimulus equivalence in human participants have generally been unsuccessful in animals. However, functional equivalence classes have been demonstrated in pigeons and sea lions using a concurrent repeated reversal discrimination procedure. In this procedure, responding to one set of stimuli is reinforced but responding to a different set is not and the set associated with reinforcement is changed with multiple reversals during the experiment. The experiments reported here were designed to assess whether functional equivalence classes could be demonstrated in rats using similar techniques. Rats were initially trained with two sets of olfactory stimuli (six odors/set). Following many reversals, probe reversal sessions were conducted in which rats were exposed to a subset of the members of each set and, later in the session, the withheld stimuli were introduced. Responding to these delayed probe trials in accord with the reversed contingencies constituted transfer of function. There was some evidence of transfer in Experiment 1, but the effects were relatively weak and variable. Experiment 2 introduced procedural changes and found strong evidence of transfer of function consistent with the formation of functional equivalence classes. These procedures offer a promising strategy to study symbolic behavior in rodents.     

Predicting the Performance of Dental Hygiene Behaviors: An Examination of the Fishbein and Ajzen Model and Self-Efficacy Expectations1

This study examined the value of the Fishbein and Ajzen model of behavioral intentions and Bandura's concept of self-efficacy expectations as prospective predictors of the dental hygiene behaviors of young adults. All participants (73 males and 58 females) completed self-report measures of the predictor variables and 60% of that group (N = 77) then recorded brushing and flossing behaviors over a four-week period. The Fishbein and Ajzen model accounted for a significant proportion of the variance in intentions to brush (R²= .32) and intentions to floss (R²= .30). Intentions were in turn related to self-monitoring records of brushing and flossing frequency (rs= .52 and .61). Introducing self-efficacy expectations into the Fishbein and Ajzen model failed to improve the prediction of brushing and flossing frequency. However, self-efficacy was predictive of behavioral intentions, adding significantly to the variance accounted for by the attitudinal and subjective norm components of the Fishbein and Ajzen model. These data suggest that self-efficacy expectations are important in understanding protective health behaviors and that the inclusion of a self-efficacy component in the Fishbein and Ajzen model deserves consideration.     

Sex stereotyping of infants: A review of gender labeling studies

Studies that have addressed the question of whether adults and children respond differently to male and female infants because of actual differences in the infants or because of preconceived sex stereotypes are reviewed, and the overall conclusions from these studies are evaluated. Twenty-three studies were identified in which neutrally clothed infant stimuli were labeled male in some conditions and female in other conditions. The strength and consistency of gender labeling effects on perceptions and behaviors in these studies were appraised. The results indicate that knowledge of an infant's gender is not a consistent determinant of adults' reactions, but more strongly influences young children's reactions. The implications of these findings for research on early sex role socialization are considered.     

Detection of coherence-disrupting and coherence-conferring alterations in text

In a study phase, subjects were presented with sentence pairs which were either coherent or anomalous. In a subsequent recognition test, each sentence pair was presented either in its original form or with one word changed. The changed word either disrupted the coherence of a previously coherent sentence pair or conferred coherence on a previously anomalous sentence pair. Alterations were more accurately detected if they were coherence-disrupting than if they were coherence-conferring. In a coherence-conferring alteration, the altered sentence can be assimilated to one of the abstract cognitive units activated by the studied sentence pair, whereas in a coherence-disrupting alteration, the altered sentence cannot be so assimilated. Analogous asymmetries have been observed for musical sequences that are coherent or anomalous with respect to tonality and rhythm. These parallels suggest that principles of cognitive organization that are responsible for our intuitions of coherence cut across propositional and nonpropositional domains.     

Masculine or feminine gender identity in boys: Developmental differences between two diverse family groups

Early developmental experiences of 66 boys, ages 4–11, who preferred the clothes, toys, and companionship of girls, preferentially role-played as females, and stated their wish to be girls, were compared with those of 56 conventionally masculine boys, selected on the basis of matched demographic features of their families. The “feminine” boys were more often described as having been “beautiful” infants, and were hospitalized more often during their early years. Mothers reported less physical contact with the “feminine” sons in the first years and less time spent with these sons. Fathers also reported spending less time with “feminine” sons during the first years. There was no difference between groups of parents regarding their wish for a girl or a boy during the pregnancy with this son. There were no major distinctions between the two groups of parents on marital role division or marital satisfaction.     

Effects of extended father-infant contact during the newborn period

Studies within the past decade have suggested that extended contact between mothers and newborns may have positive effects on later parent-infant interaction and may impact favorably upon the establishment of the mother-to-infant attachment bond. The present study was designed to determine whether similar extended contact effects occur for fathers. The results indicated that a group of fathers who attended their infants' births and received extended postpartum hospital contact with their infants engaged in greater amounts of en face behavior and vocalization with their infants and were more involved in infant caretaking responsibilities at 6 weeks postpartum and had higher self-esteem scores following the births compared to another group of fathers who attended their infants' births but received traditional amounts of hospital contact. Although there were more behavioral similarities than differences between the two groups of fathers, positive effects were found on behavioral measures, standardized psychometric measures, and on self-report questionnaires. The results indicated that extended contact effects are at least as salient with fathers as with mothers.     

Parents' gender-stereotyped perceptions of Newborns: The Eye of the Beholder revisited

Sex Roles - This study sought to update and extend J. Z. Rubin, F. J. Provenzano, and Z. Luria's [(1974) “The Eye of the Beholder: Parents' Views on Sex of Newborns,” American...     

Formal,systematic, and metasystematic operations with a balance-beam task series: A reply to Kallio's claim of no distinct systematic stage

This reply discusses the measurement of formal, systematic, and metasystematic stages. Recent multidomain studies have shown disparate results and we suggest that these results could be attributed not to actual variations in adult development or the existence or non-existence of stage, but instead may reflect differences in methodology regarding task, domain, and scoring. Our study indicates that when tested in only one domain—balance beams and extensions of those tasks—participants who performed at the higher stage were also able to perform at the lower stages. These results also coincide with similar studies conducted.