Does matter really matter? Computer simulations,experiments, and materiality

A number of recent discussions comparing computer simulation and traditional experimentation have focused on the significance of “materiality.” I challenge several claims emerging from this work and suggest that computer simulation studies are material experiments in a straightforward sense. After discussing some of the implications of this material status for the epistemology of computer simulation, I consider the extent to which materiality (in a particular sense) is important when it comes to making justified inferences about target systems on the basis of experimental results.     

Preferences for Life-Prolonging Medical Treatments and Deference to the Will of God

We defined and measured a dimension of religiosity frequently invoked in end-of-life (EOL) research—deference to God’s Will (GW)—and examined its relationship to preferences for life-prolonging treatments. In a 35-min telephone interview, 304 older men and women (60 +) were administered the 5-item GW scale, sociodemographic questions, three attitude items regarding length of life, and measures of two health indices, depression, and life-prolonging treatment preferences. The GW scale demonstrated internal consistency (Cronbach’s alpha = .94) and predictive and discriminant validity. Higher scores indicative of greater deference to GW were associated with stronger life-prolonging treatment preferences in poor-prognosis scenarios. Implications for the role of religiosity in medical decision-making are discussed.     

How Bad Is It? Perceptions of the Relationship Impact of Different Types of Internet Sexual Activities

Internet sex has become a ubiquitous phenomenon that is affecting couples and families. Eight scenarios (from visiting various adult web sites to having sex) involving a male or female character in a committed relationship were presented in a survey format. Participants (n = 242) rated each scenario in terms of emotional and physical involvement, amount of distraction from the primary relationship, and whether the respondent considered the scenario to be an affair. Results indicate that perceptions of internet activities differed depending on the type of internet sexual activity, although the majority of the internet sexual activities were considered to be highly emotional involving, a distraction to the relationship, and sexual in nature, though no physical contact was involved. The gender of the character in the scenario had no effect on participants' responses. Women tended to see the scenarios as being more serious than men. Clinical implications are discussed.     

Six‐month follow‐up of two mother–infant psychotherapies: Convergence of therapeutic outcomes

Fifty‐eight mothers and infants participating in two infant–mother psychotherapeutic interventions in a comparative infant–mother clinical intervention study were followed six months after treatment ended. One treatment was an infant‐led psychotherapy, Watch, Wait, and Wonder (WWW). The other was a more traditional mother–infant psychodynamic psychotherapy (PPT). Infants ranged in age from 10 to 30 months at the outset of treatment, which took place in weekly sessions over approximately five months. Results indicated that positive effects observed from the beginning to the end of treatment in both treatment groups in infant symptoms, parenting stress, and mother–infant interaction were maintained or improved further at six‐month follow‐up. Additionally, decreased maternal depression, gains in infant cognitive development and emotion regulation, and improved infant–mother attachment security or organization had been observed posttreatment only in the WWW group. Interestingly, between the posttreatment to follow‐up period the PPT group also showed such gains. Thus, for these variables it would be more accurate to say that the outcomes were similar for the two treatment groups but change emerged at a different pace. Nevertheless, an advantage persisted in the WWW group in relation to mothers' comfort dealing with infant behaviors and their ratings of parenting stress which improved more in this group from the end of treatment to follow‐up. The direct inclusion of the infant as an initiator in WWW was set forth as an explanation of differentially timed treatment effects. ©2002 Michigan Association for Infant Mental Health.     

Visuotactile apparent motion

This article compares the properties of apparent motion between a light and a touch with apparent motion between either two lights or two touches. Visual and tactile stimulators were attached to the tips of the two index fingers that were held apart at different distances. Subjects rated the quality of apparent motion between each stimulus combination for a range of stimulus onset asynchronies (SOAs). Subjects reported perceiving apparent motion between all three stimulus combinations. For light-light visual apparent motion, the preferred SOA and the direction threshold SOAs increased as the distance between the stimuli increased (consistent with Korte's third law of apparent motion). Touch-touch apparent motion also obeyed Korte's third law, but over a smaller range of distances, showing that proprioceptive information concerning the position of the fingers is integrated into the tactile motion system. The threshold and preferred SOAs for visuotactile apparent motion did not vary with distance, suggesting a different mechanism for multimodal apparent motion.     

Age differences in sensation seeking and impulsivity as indexed by behavior and self-report: evidence for a dual systems model

It has been hypothesized that sensation seeking and impulsivity, which are often conflated, in fact develop along different timetables and have different neural underpinnings, and that the difference in their timetables helps account for heightened risk taking during adolescence. In order to test these propositions, the authors examined age differences in sensation seeking and impulsivity in a socioeconomically and ethnically diverse sample of 935 individuals between the ages of 10 and 30, using self-report and behavioral measures of each construct. Consistent with the authors' predictions, age differences in sensation seeking, which are linked to pubertal maturation, follow a curvilinear pattern, with sensation seeking increasing between 10 and 15 and declining or remaining stable thereafter. In contrast, age differences in impulsivity, which are unrelated to puberty, follow a linear pattern, with impulsivity declining steadily from age 10 on. Heightened vulnerability to risk taking in middle adolescence may be due to the combination of relatively higher inclinations to seek excitement and relatively immature capacities for self-control that are typical of this period of development.     

The development of automatic numerosity processing in preschoolers: evidence for numerosity-perceptual interference

Three experiments examined developmental changes in the automatic processing of numerosity and perceptual information using a nonsymbolic numerical Stroop paradigm. In Experiments 1 and 2 (E1 and E2), 4-, 5-, and 6-year-olds had to compare the numerosities or the total filled areas of collections of dots (E1) or bars (E2) varying along both dimensions. Experiment 3 replicated E2's results in 3-, 4-, and 5-year-olds. Results demonstrated the existence of reciprocal influences between numerical and perceptual information beginning at age 3. Moreover, the irrelevant perceptual influences remained stable throughout development, whereas the sensitivity to irrelevant numerical cues tended to increase with age despite children's growing inhibition capacities. No significant correlation could be found between these developmental changes and the acquisition of counting knowledge.