Little is known about why some people experience greater temporal fluctuations of relationship perceptions over short periods of time, or how these fluctuations within individuals are associated with relational processes that can destabilize relationships. Two studies were conducted to address these questions. In Study 1, long-term dating partners completed a 14-day diary study that assessed each partner's daily partner and relationship perceptions. Following the diary phase, each couple was videotaped trying to resolve the most important unresolved problem from the diary period. As predicted, (a) individuals who trusted their partners less reported greater variability in perceptions of relationship quality across the diary period; (b) they also perceived daily relationship-based conflict as a relatively more negative experience; and (c) greater variability in relationship perceptions predicted greater self-reported distress, more negative behavior, and less positive behavior during a postdiary conflict resolution task (rated by observers). The diary results were conceptually replicated in Study 2a, in which older cohabiting couples completed a 21-day diary. These same participants also took part in a reaction-time decision-making study (Study 2b), which revealed that individuals tend to compartmentalize positive and negative features of their partners if they (individuals) experienced greater variability in relationship quality during the 21-day diary period and were involved in higher quality relationships. These findings advance researchers' understanding of trust in intimate relationships and provide some insight into how temporal fluctuations in relationship quality may undermine relationships.

The current research tested a model proposed by Baumeister and Bratslavsky (1999) suggesting that passion’s association with intimacy is best understood as being linked with changes in intimacy over time. Within this framework, when intimacy shows relatively large and rapid increases, levels of passion should be high. When intimacy remains unchanged over time, levels of passionate experience should be low. To test this hypothesis, 67 heterosexual couples involved in long-term relationships completed daily measures of intimacy, passion, and sexual satisfaction for 21 consecutive days. Analyses guided by the actor–partner interdependence model ( Kenny, Kashy, & Cook, 2006 ) demonstrated that day-to-day changes in intimacy for both partners predicted relationship passion, sexual frequency, and sexual satisfaction in a manner conforming to Baumeister and Bratslavksy’s model. These results represent the first empirical support for this model of intimacy and passionate experience.

The thresholds of audibility for 100 and for 1000 cps have been measured on five groups of originally naive listeners by various experimental techniques. All the experiments showed improvement of the threshold with practice. The improvement was greater at 100 cps than at 1000 cps. Pretraining at 1000 cps did not affect the threshold change at 100 cps. The improvement of the threshold with practice was enhanced considerably by reward and feedback.

Cells transformed by Rous sarcoma virus take up 2-deoxyglucose at a faster rate than uninfected cells, under conditions where transformed and nontransformed cells grow at the same rate. In cells infected by a temperature-sensitive mutant, the stimulation of 2-deoxyglucose uptake is temperature dependent: the increase is observed at the permissive (360C), but not at the nonpermissive (41.50) temperature. When Sefton and Rubin, manuscript in preparation) have showni that the rate of uptake of 2-deoxyglucose by normal, uninfected cells depends upon their physiological state. Sparse, rapidly-growing cells take up 2-deoxyglucose at a faster rate than dense, slowly growing cells (6); furthermore, the uptake by density-inhibited monolayers is stimulated by the addition of serum or trypsin to the medium (Sefton and Rubini, manuscript in preparation). The present experiments make clear, however, that even under conditions where transformed and normal cells grow at the same rate, the transformed cells take up 2-deoxyglucose at a faster rate than normal cells. Thus, under these conditions, the rate of uptake can be used as a measure of transformation. We have used this property of transformed cells to study the effect of temperature shifts on cells infected by the temperature-sensitive mutant, T5 (4) of the Schmidt-Ruppin strain of RSV, subgroup A (SR-RSV-A). MATERIALS AND METHODS Virus infectionThe methods used for the preparation of chicken embryo fibroblasts and propagation of virus stocks have been described (3, 7). Freshly cloned virus was used, in order to minimize the number of temperature-resistant revertants and of nontransforming variants (Martin and Duesberg, manuscript in preparation) in the virus stocks. Cells for infection were plated at 3 X 106 per 100-mm plastic dish in medium A (medium 199, supplemented with 2% tryptose phosphate broth, 1% calf serum, and 1% chicken serum).4 hr later, the medium was removed and the cells were infected with 1 ml of virus (titer 5 X 105 to 1 X 106 focusforming units/ml). After 1 hr, medium B (medium 199, supplemented with 10% tryptose phosphate broth, 4% calf serum, and 1% chicken serum) was added. The cells were grown for 4 days at 41'C, with daily medium change, then treated with trypsin and plated at 1.2 to 1.5 X 106 cells per 35-mm dish in 3 ml of medium B supplemented with 0.1% glucose. Plates were incubated at 36 or 41.50C as indicated, and the medium was changed every 12 or 18 hr. Experiments were started 24 hr after plating.Measurement of 2-deoxyglucose uptake Cells were washed twice with warm, glucose-free Hanks solution. They were then incubated for 10 min at 390C with the same solution, containing 0.25 jACi/ml of 2-deoxy- [3H]glucose (New England Nuclear Corp.; specific activity

Four of seven human male subjects developed full penile erections when exposed to erotically stimulating motion pictures. Changes in penile size were detected by a mercury strain gauge transducer and automatically recorded on a continuous paper record. When instructed to inhibit penile erection in the presence of such effective stimulus films, every subject was able to reduce his erection by at least 50%. This inhibition was apparent as long as the instructions were in effect; when the instructions were removed and the film reshown, the erection returned almost to its maximum state. This was true whether the films were presented as few as three or as many as nine times in succession. When instructed to develop an erection in the absence of a film, every subject was able to do so, each reaching a peak of about 30% of his maximum. Such erections had longer latencies to the peak produced and lower maximum levels than those elicited by a film.