Katherine Hildebrandt Karraker

Delay discounting and probability discounting as related to cigarette smoking status in adults.

This study examined relations between adult smokers and non-smokers and the devaluation of monetary rewards as a function of delay (delay discounting, DD) or probability (probability discounting, PD). The extent to which individuals discount value, either as a function of a reward being delayed or probabilistic, has been taken to reflect individual differences in impulsivity. Those who discount most are considered most impulsive. Previous research has shown that adult smokers discount the value of delayed rewards more than adult non-smokers. However, in the one published study that examined probability discounting in adult smokers and non-smokers, the smokers did not discount the value of probabilistic rewards more than the non-smoker controls. From this past research, it was hypothesized that measures of delay discounting would differentiate between smokers and non-smokers but that probability discounting would not. Participants were 54 (25 female) adult smokers (n = 25) and non-smokers (n = 29). The smokers all reported smoking at least 20 cigarettes per day, and the non-smokers reported having never smoked. The results indicated that the smokers discounted significantly more than the non-smokers by both delay and probability. Unlike past findings, these results suggest that both delay and probability discounting are related to adult cigarette smoking; however, it also was determined that DD was a significantly stronger predictor of smoking than PD.

Adolescent mothers' knowledge of child development and expectations for their own infants

Adolescent mothers of 8- to 14-month-old infants gave fewer correct responses on the Developmental Milestones Survey (DMS) and were less accurate in predicting whether or not their infants would pass Bayley items than adult mothers of same-aged infants. Adolescent mothers were more likely to underestimate their infants performance if the mothers received lower scores on the DMS, especially if they were likely to guess too young an age when they missed DMS items. Adult mothers, on the other hand, were more likely to underestimate their infants performance if the mothers were likely to guess too old an age when they missed DMS items. Some adolescent mothers thus expect too little too late from their own infant and too much too soon from the average infant. These mothers may fail to encourage their infants development and may perceive their infant as less competent than other infants because of these expectations.

A Big Five model of disposition and situation interaction: why a “helpful” person may not always behave helpfully

Abstract A “bottom-up” Big Five disposition–situation interaction model is introduced that highlights the interactive relation between an individuals behavioral trait tendencies and the different facets of a situation to which he or she may respond. In the proposed model, personality traits are considered markers for how an individual might interpret and respond to different facets of a situation. Given a complex situation with multiple response options, a person will respond to the part of the situation most salient to him or her at that time. The presented model illustrates how interactions between the trait dimensions of the Big Five model with the different facets of a situational context, as well as the intra-individual interactions between the different trait dimensions themselves, determine which facet of a situation will be salient. The model is expected to improve prediction of specific behaviors in specific situations using personality traits. Results from an illustrative study are presented.

Children's and adults' sex-stereotyped perceptions of infants

Sex-stereotyped perceptions of infants were examined in children (aged 5, 9, and 15 years), college students, and the childrens mothers. The children and college students as a group rated labeled female infants as littler and as more beautiful, nice, and soft than labeled male infants, with no age changes in sex-stereotyped perceptions. The mothers as a group were not influenced by the labeled sex manipulation. The 5-year-olds rated the infants the least favorably and the mothers rated the infants the most favorably. Girls rated the infants as more beautiful than the boys did. Finally, the mothers with higher masculinity scores and their sons showed less sex-stereotyped perceptions of the infants than mothers with lower masculinity scores and their sons.

Young Adults’ Responses to Infant Names

Abstract Many parents in the United States devote a great deal of attention to selecting their children’s names. To better understand this process, 532 potential parents in the United States rated their liking and perceptions of infant names. Liking was related to characteristics of the names (such as popularity, defined as how frequently the names had been previously selected by parents) and to characteristics of the raters (such as their personality traits and gender). Ratings of the physical and behavioral traits of infants depicted through both a name and a photograph were related more strongly to ratings of the photograph alone than the name alone. These results suggest that parent preferences for certain names may account for changes in name popularity over time, and also suggest that the influence of names on adults’ perceptions of infants may be superseded by the influence of the infants’ physical appearance.