Paying Attention to Time as One Gets Older

Age-related changes in attention and interval timing as a function of time of day were examined using a temporal bisection task with single and compound auditory and visual stimuli. Half of the participants in each age group were tested in the morning, and half were tested in the afternoon. Duration judgments were found to be shorter for visual signals than for auditory signals. This discrepancy was greater in the morning than in the afternoon and larger for the older than for the younger adults. Young adults showed equal sensitivity to signal duration for single and compound trials and higher sensitivity in the afternoon than in the morning for both signal modalities. In contrast, older adults showed impaired sensitivity on compound trials and the greatest sensitivity overall to single visual trials in the morning. These results suggest that age-related reductions in attentional resources may cause older adults to focus on signals that require controlled attention during specific phases of the circadian cycle.     

Working memory span and the role of proactive interference.

The authors investigated the possibility that working memory span tasks are influenced by interference and that interference contributes to the correlation between span and other measures. Younger and older adults received the span task either in the standard format or one designed to reduce the impact of interference with no impact on capacity demands. Participants then read and recalled a short prose passage. Reducing the amount of interference in the span task raised span scores, replicating previous results (C. P. May, L. Hasher, & M. J. Kane, 1999). The same interference-reducing manipulations that raised span substantially altered the relation between span and prose recall. These results suggest that span is influenced by interference, that age differences in span may be due to differences in the ability to overcome interference rather than to differences in capacity, and that interference plays an important role in the relation between span and other tasks.     

The Church and the World: Are There Theological Resources for a Common Conversation?

Abortion is an especially salient issue for considering thegeneral problematic of religiously based conversation in thepublic square. It remains deeply divisive, fully thirty-fouryears after Roe v. Wade. Such divisiveness cannot be interpretedas merely an expression of profound differences between "secular"and "religious" voices, because differences also emerge amongChristian denominations, reflecting different sources of moralauthority, different accounts of moral discernment, and differentjudgments about the appropriate relations between law and moralityin the context of pluralism. As this paper explores, however,despite those differences, a generally identifiable "Christian"position concerning the moral status of abortion can be distinguishedfrom secular philosophical judgments on the issue, which isimportant for Christian engagement with public policy debate.     

The Influence of Authoritative Parenting During Adolescence on Depressive Symptoms in Young Adulthood: Examining the Mediating Roles of Self-Development and Peer Support

A diverse sample of 1,143 high school seniors and 182 students who were part of the same cohort but who left high school without graduating were interviewed during late adolescence (Time 1 [T1]) as well as 2 (Time 2 [T2]) and 4 years later (Time 3 [T3]). Perceived self-development, peer support, and prior levels of depressive symptoms (T2) were hypothesized to mediate the relationship between authoritative parenting during adolescence (T1) and depressive symptoms during young adulthood (T3). T2 sense of self as worthy and efficacious and depressive symptoms, but not peer support, fully mediated the effect of authoritative parenting on T3 depressive symptoms. The authors discuss the importance of parenting for healthy, emerging adult self-development and the continuing influence of parenting styles during adolescence on young adult depressive symptoms.     

Escaping the recent past: Which stimulus dimensions influence proactive interference?

Proactive interference occurs when information from the past disrupts current processing and is a major source of confusion and errors in short-term memory (STM; Wickens, Born, & Allen, Journal of Verbal Learning and Verbal Behavior, 2:440–445, 1963). The present investigation examines potential boundary conditions for interference, testing the hypothesis that potential competitors must be similar along task-relevant dimensions to influence proactive interference effects. We manipulated both the type of task being completed (Experiments 1, 2, and 3) and dimensions of similarity irrelevant to the current task (Experiments 4 and 5) to determine how the recent presentation of a probe item would affect the speed with which participants could reject that item. Experiments 1, 2, and 3 contrasted STM judgments, which require temporal information, with semantic and perceptual judgments, for which temporal information is irrelevant. In Experiments 4 and 5, task-irrelevant information (perceptual similarity) was manipulated within the recent probes task. We found that interference from past items affected STM task performance but did not affect performance in semantic or perceptual judgment tasks. Conversely, similarity along a nominally irrelevant perceptual dimension did not affect the magnitude of interference in STM tasks. Results are consistent with the view that items in STM are represented by noisy codes consisting of multiple dimensions and that interference occurs when items are similar to each other and, thus, compete along the dimensions relevant to target selection.     

Modality differences in timing and temporal memory throughout the lifespan

The perception of time is heavily influenced by attention and memory, both of which change over the lifespan. In the current study, children (8 yrs), young adults (18–25 yrs), and older adults (60–75 yrs) were tested on a duration bisection procedure using 3 and 6-s auditory and visual signals as anchor durations. During test, participants were exposed to a range of intermediate durations, and the task was to indicate whether test durations were closer to the “short” or “long” anchor. All groups reproduced the classic finding that “sounds are judged longer than lights”. This effect was greater for older adults and children than for young adults, but for different reasons. Replicating previous results, older adults made similar auditory judgments as young adults, but underestimated the duration of visual test stimuli. Children showed the opposite pattern, with similar visual judgments as young adults but overestimation of auditory stimuli. Psychometric functions were analyzed using the Sample Known Exactly-Mixed Memory quantitative model of the Scalar Timing Theory of interval timing. Results indicate that children show an auditory-specific deficit in reference memory for the anchors, rather than a general bias to overestimate time and that aged adults show an exaggerated tendency to judge visual stimuli as “short” due to a reduction in the availability of controlled attention.     

Depressive Symptoms and Life Satisfaction Among Emerging Adults: A Comparison of High School Dropouts and Graduates

Using three waves of data (1998, 2000, 2002) on 1,325 emerging adults, we examined depressive symptoms and life satisfaction among a diverse group of high school dropouts and graduates. Emerging adults who left school without graduating were significantly more depressed and reported lower life satisfaction than graduates at the time of their expected graduation (T1), but these differences were nonsignificant 4 years later (T3). Working within an ecological developmental framework (Bronfenbrenner 1977, 1986), we found that graduation status, household composition, family general and transition specific support, peer support, and adolescent attachment styles protected against adverse mental health consequences at T1. However, only parent and peer support and attachment predicted changes in depressive symptoms and life satisfaction from T1 to T3.     

Social support in chumships and adjustment in children of divorce

Examined the relations between support from intimate friends or "chums" and stress, age, and gender in predicting psychological adjustment using a sample of 117 8- to 15-year old children who had experienced parental divorce. Both parents and children provided information on children's adjustment. In predicting children's reports of their adjustment, the direct effect of chum support was found to be moderated by children's age. In predicting parental reports of children's adjustment, no significant main effects or interaction effects occurred. The findings are discussed with attention to the divergent perspectives of different reporters.     

Chronic treatment with haloperidol induces deficits in working memory and feedback effects of interval timing

Normal participants (n=5) having no experience with antipsychotic drugs and medicated participants (n=5) with clinical experience with chronic low doses of haloperidol (3-10 mg/day for 2-4 months) in the treatment of neuroses were evaluated for the effects of inter-trial interval (ITI) feedback on a discrete-trials peak-interval timing procedure. Feedback was presented during the ITI in the form of a histogram showing the distribution of the responses participants made on the previous trial plotted on a relative time scale. As feedback concerning the accuracy and precision of a reproduced duration (e.g., 7- and 14-s visual signals) became more remote in time, reproduced intervals gradually lengthened in duration. This rightward horizontal shift in peak time increased as a function of the probability of feedback and was enhanced by chronic treatment with haloperidol in a manner that was proportional to the duration of the signal. Our data suggest a gradual change in the underlying representation of the signal duration as a function of the remoteness of ITI feedback that is dependent upon both changes in working memory and the speed of the internal clock used to time durations in the seconds-to-minutes range.