Evaluation of a possible proximity effect of aspartame and vitamin C on muscular strength

Inconsistent findings of a proximity effect on muscular strength, using a neutral control substance, prompted the current study. Double-blind, counterbalanced assessments of grip strength were performed, with subjects holding either an envelope of ascorbic acid (Vitamin C) or aspartame. No proximity effects were found despite the use of two substances believed by some applied kinesiologists to yield positive and negative results, respectively.     

Asymmetrical interactions between thirst and hunger in pavlovian-instrumental transfer

Pavlovian-instrumental transfer experiments have demonstrated that a stimulus paired with a sucrose solution under hunger will increase instrumental performance under thirst relative to a stimulus previously paired with food pellets. In Experiment 1 it was demonstrated that this difference is, in part, produced by suppression induced by the pellet stimulus, which, it was found, acted to reduce instrumental performance under thirst. In Experiment 2, the reverse shift was examined, comparing the effects of stimuli paired with either a saline solution or a sucrose solution under thirst on instrumental performance under hunger. Although the sucrose stimulus was found to elevate performance when hungry, the saline stimulus was found to be without effect. This asymmetry in the interaction between hunger and thirst is discussed in terms of the way motivational states control the interaction between sensory and affective components of the reinforcer.     

INITIAL INTERACTION BETWEEN STRANGERS AND ACQUAINTANCES A Multivariate Analysis of Factors Affecting Choice of Communication Partners

In a large-scale field experiment, data were collected on proximity, demographic and attitudinal similarities, and frequency of interaction of strangers and acquaintances in a situation of free choice. The results of the log linear analysis show that while previous acquaintance and proximity have a strong effect on frequency of interaction, demographic and attitudinal similarities have only a small effect. All these factors together do not account for the observed frequencies of interaction. Future models of early periods of interaction must utilize other factors in addition to those common in research on interpersonal attraction.     

Learning in honeybees (Apis mellifera) as a function of sucrose concentration.

Foraging honeybees (Apis mellifera) were trained with 2 successively presented targets differing in color or odor, one of which always contained a 5-microliters drop of 50% sucrose solution and the other, a 5-microliters drop of 20% sucrose solution. Latency of response to each target was measured during the training, and at the conclusion, preference was measured in an unrewarded choice test. Analysis of the latencies showed both a prospective effect (faster response to the 50% target than to the 20% target) and a nonassociative retrospective effect (faster response after leaving the 20% target than after leaving the 50% target) reminiscent of the frustration effect in rats. The results both for prospective latency and for choice can be understood on the simple theory that the attractiveness of a target depends on the strength of its association with sucrose and that the effect of concentration is on asymptotic strength.     

Ontogenetic changes in the modulation of taste aversion learning by home environmental cues in rats

Eight experiments using 611 rats as subjects were conducted to define and analyze an age-related phenomenon of conditioned taste aversion. When consumption of sucrose solution was followed by LiCl-induced illness in the animals' home, acquisition of the aversion to sucrose solution was retarded in preweanling (18-day-old) rats. This effect was not found in adults or in slightly older (21-day-old) rats. Place of testing had no effect in the younger two age-groups, but in adults manifestation of the acquired aversion was retarded when they were tested in the home. There was no interaction between place of conditioning and testing for any age. The locus of the environmental influence on conditioning in preweanling rats was found to be the place of tasting rather than place of illness, retention interval, or testing. Also, the effect was found to be invariant under minor variations in familiarization of the animal with the non-home environment. The principle emerging from these data and others is that the home environment can have a significant influence on learning and conditioning in the immature rat.     

Facilitation of letter recognition by an annulus in a metacontrast paradigm

The recognition of a single letter is found to improve when it is surrounded by an annulus in close proximity. This facilitatory effect is obtained only when annulus and target durations are equal and onsets are simultaneous. When the annulus is increased in size, the facilitatory effect is found first to increase in magnitude and then to decline; no interaction between target letter and annulus is observed for large diameter annuli (72'+). The results are interpreted with reference to a lateral inhibitory model of spatio-temporal interactions.     

A possible proximity effect on human grip strength: an attempted replication

A double-blind experiment with 50 adults was conducted to replicate a finding that proximity to sugar reduces human grip strength. Grip strength of the dominant hand was measured by a chart-recording hand dynamometer for 12 trials. For half of the trials, the subject held an opaque, sealed bottle containing sugar; for half of the trials, the subject held a control bottle of equal weight containing sand. Statistical analysis indicated no significant effect of held substance upon grip strength.     

Timing of the CS-US Interval by Pigeons in Trace and Delay Autoshaping

Evidence for timing during Pavlovian trace and delay conditioning trials was sought by exposing pigeons to differentially cued trial durations of 18, 24, and 60 sec. For a delay group, one of three visual patterns (CSs) was presented on a key for the entire trial; for a trace group, each CS was 12 sec in duration, creating trace gaps of 6, 12, or 48 sec. Intertrial interval duration was 48 sec. The most informative data were provided by measures of time spent proximal to the CS (proximity). Stimulus control was evident in that proximity was inversely related to trial duration for both groups. Evidence for timing was obtained from the relation of relative proximity during each CS to relative elapsed trial time for individual birds. The obtained superposition of the three functions for each bird is consistent with a scalar timing process and implies that subjects learned the temporal relation between each CS and the unconditioned stimulus. Associative status of the CSs differed between groups and among CS-US intervals, as reflected in proximity data during a higher-order test in which the CSs served as reinforcers. The results are consistent with a two-dimensional model of Pavlovian conditioning according to which the associative strength accruing to a CS is orthogonal to the temporal information encoded for that stimulus.     

Sensory scales of taste intensity

The subjective intensity of taste was scaled by the method of magnitude estimation in which Os assigned numbers to designate the apparent strength ofstimulus concentrations. Substances used were sucrose, dextrose, maltose, fructose, saccharin, Sucaryl, sodium chloride, and quinine sulfate. For aqueous solutions of each substance, taste intensity was found to increase as a power function of concentration by weight. Some approximate exponents were: sucrose, 1.3; sodium chloride, 1.4; quinine sulfate. 1.0. The magnitude scale for sucrose was compared with the category scale obtained by a commonly used rating procedure. The category scale turned out to be highly nonlinear.     

Maternal attitudes during pregnancy predict mother-infant physical proximity six months after birth

The purpose of this study was to develop an instrument for assessing maternal attitudes. Three photographs representing infants or mother-infant dyads were presented to 26 mothers in the second half of pregnancy and six months after birth. Nine mothers were clinical cases, seventeen mothers were nonpathological controls. Thirty-three semantic categories were used to code the mothers' responses to the pictures. Mothers' responses were coded independently by two researchers. The factor analysis of the codes yielded an ‘attraction to, vs rejection of, children’ factor. Compared with the control group, the mean factor score of the clinical group was significantly lower, i. e. reflected less attraction (p < 0.01). To study the relation between the attraction factor and the physical proximity of mothers and infants, 21 of these mother-infant dyads were videotaped in a semi-structured play interaction six months after birth. Recordings were coded independently by two researchers for various indices of proximity (spatial proximity, kisses, embraces, touches). The factor analysis of the codes yielded a factor contrasting distant vs close and tender interaction. A significant correlation was found between the attraction scores of pregnant women and the proximity scores of mother-infant interaction (r = 0.46; p < 0.05). These results suggest that this instrument is useful in assessing maternal attitudes of psychiatrically disturbed pregnant women and that maternal attitudes of pregnant women are significant predictors of physical proximity in motherinfant interaction at the end of the first semester.     

Age differences in forgivingness: The role of future time perspective

The present study examined age differences in forgivingness, defined as an enduring tendency to forgive others. Building on the theory of socioemotional selectivity, the study aimed at clarifying the role of future time perspective and social proximity on age differences in forgivingness. Older (N = 132) and younger participants (N = 225) were instructed to judge their willingness to forgive as a function of social proximity and future time perspective. Controlling for self-reported future time perspective, results indicate that older adults were more willing to forgive than younger adults. Social proximity did not play a role in older adults, whereas younger adults reported greater forgivingness with respect to a friend as compared to an acquaintance. In addition, results demonstrate that the perception of future time plays an essential role in forgivingness. An age by future time perspective interaction effect was found, suggesting that the effect of limited future time perspective was smaller in older adults than in younger adults. Future directions concerning the meaning and possible implications of age differences in forgivingness are discussed.     

The effects of categorical similarity and feature-space proximity on visual working memory processing

Two patterns of data predict that similarity has a positive effect and a negative effect on visual working memory (VWM) processing. We assume that these two empirical outcomes do not distinguish categorical similarity from feature-space proximity, resulting in this divergence. To investigate how categorical similarity and feature-space proximity modulate VWM, we tested memory for an array of pictures drawn from either mixed categories or a single category in which feature-space proximity varied along a morph continuum in a change-detection task. We found that memory under the mixed-category condition was better than that under the single-category condition, whereas memory under high feature-space proximity was superior to that under low feature-space proximity. These patterns were unaffected by manipulations of stimulus type (faces or scenes), encoding duration (limited or self-paced), and presentation format (simultaneous or sequential). These results are consistent with our hypotheses that categorical similarity inhibits VWM, whereas feature-space proximity facilitates VWM. We also found that memory for items with low feature-space proximity benefited more from mixed-category encoding than that for items with high feature-space proximity. Memory for faces benefited more from mixed-category encoding than scenes, whereas memory for scenes benefited more from feature-space proximity than faces. These results suggest that centre-surround inhibition organization might underlie similarity effects in VWM. Centre-surround inhibition organization for complex real-world objects could have both categorical level and feature-space level. The feature-space level might differ by category.     

Social proximity in early mother–infant interactions: implications for gender differences?

In an exploratory study, we investigated degrees of social proximity between mothers and their 9-month-old children. Twenty-four Swedish mother–infant dyads (12 boys and 12 girls) were observed during a brief free play episode. Social proximity was measured through nine items focusing on both communication and social interaction. Overall, we found that mother–daughter dyads displayed significantly higher degrees of social proximity than mother–son dyads. More specifically, mothers with daughters displayed more physical and visual contact, and were also rated as more sensitive than mothers with sons. It was also found that girls were judged as being more compliant than boys. ©1997 John Wiley & Sons, Ltd.     

Does Proximity Matter in Promoting Interfaith Dialogue?

This paper explores the role of physical proximity of places of worship in facilitating interfaith dialogue. The research focuses on a religious cluster within the Greater Toronto Area, which emerged due to incremental zoning changes over time. Using key informant interviews as the method and Allport’s contact hypothesis as the guiding theoretical framework, it explores the effects of proximity and contact (interaction or encounters) on intergroup relations. The findings suggest that physical proximity is not a strong factor in facilitating interfaith dialogue initiatives. However, proximity does seem to have an effect in creating a space for interactions and encounters to occur, which can lead to attitudinal shifts concerning the religious “other.”     

Sugar proximity and human grip strength

In a double-blind experiment with 90 undergraduate students the hypothesis was tested that proximity to sugar reduces human grip strength. An earlier study indicated that sugar proximity does indeed significantly reduce human grip strength. When additional controls were added to this design to reduce random sampling error, the hypothesis was not supported.     

The whole is equal to the sum of its parts: a probabilistic model of grouping by proximity and similarity in regular patterns

The authors investigated whether the gestalt grouping principles can be quantified and whether the conjoint effects of two grouping principles operating at the same time on the same stimuli differ from the sum of their individual effects. After reviewing earlier attempts to discover how grouping principles interact, they developed a probabilistic model of grouping by proximity, which allows measurement of strength on a ratio scale. Then, in 3 experiments using dot lattices, they showed that the strength of the conjoint effect of 2 grouping principles--grouping by proximity and grouping by similarity--is equal to the sum of their separate effects. They propose a physiologically plausible model of this law.     

Transformational leadership and group interaction as climate antecedents: a social network analysis

In order to test the social mechanisms through which organizational climate emerges, this article introduces a model that combines transformational leadership and social interaction as antecedents of climate strength (i.e., the degree of within-unit agreement about climate perceptions). Despite their longstanding status as primary variables, both antecedents have received limited empirical research. The sample consisted of 45 platoons of infantry soldiers from 5 different brigades, using safety climate as the exemplar. Results indicate a partially mediated model between transformational leadership and climate strength, with density of group communication network as the mediating variable. In addition, the results showed independent effects for group centralization of the communication and friendship networks, which exerted incremental effects on climate strength over transformational leadership. Whereas centralization of the communication network was found to be negatively related to climate strength, centralization of the friendship network was positively related to it. Theoretical and practical implications are discussed.     

Can you forgive? It depends on how happy you are

This paper examined how individual group status and happiness influence forgiveness. In Study 1, happiness was treated as a trait difference: highly happy people, compared with very unhappy people, were found to be more willing to forgive murderers. More important, an interaction effect between happiness and group status on forgiveness was found, that is, highly happy people tended to be more forgiving when either ingroup or outgroup members were killed; unhappy people, however, tended to be less forgiving about murder when ingroup rather than outgroup members were killed. In Study 2, happiness was treated as an emotional state difference: happiness, rather than sadness, was found to bring greater forgiveness. Moreover, consistent with the interaction effect displayed in Study 1, happy participants tended to forgive more when ingroup or outgroup members were hurt; sad participants tended to forgive less when ingroup members rather than outgroup members were hurt. Implications for connections between happiness, group membership, and forgiveness are discussed.     

Identity threat and antisocial behavior in organizations: The moderating effects of individual differences,aggressive modeling,and hierarchical status

This study examines whether the experience of identity threat predicts antisocial behavior directed towards other employees. A social interactionist model is used as a theoretical framework for predicting that employees who are frequent recipients of actions that challenge or diminish their sense of competence, dignity, or self-worth will engage in higher levels of antisocial behavior. However, it is predicted that the strength of this relation will be moderated by individual (gender, age, and attitudes toward revenge) and situational (aggressive modeling, hierarchical status) factors. Data from 308 employees from three organizations supported moderating effects of age, revenge attitudes, and hierarchical status. A three-way interaction was also found showing that identity threat was more strongly related to antisocial behavior for low as compared to high status employees, but only when they were exposed to low levels of aggressive modeling.     

Experimental manipulations of social status and stress-induced cardiovascular responses in high and low trait dominant men

The present study investigated the effect of a mismatch between trait dominance and induced status on cardiovascular reactivity to and recovery from a dyadic interaction task. Eighty normotensive men characterized as either high or low in trait dominance engaged in a discussion requiring persuasive behavior either in the context of a high or low induced status position. The outcome of a rigged competition was used as a marker of status. Induced status was found to moderate cardiovascular recovery of dominance groups. High dominant individuals exhibited less complete recovery of diastolic blood pressure (DBP) when placed in a low compared to high status position, whereas recovery of low dominant individuals tended to show greater impairment in a high status position. Results for changes in emotional states also indicate a detrimental effect of incongruous status positions, particularly for high dominant individuals. Subjective experiences did not mediate cardiovascular effects, though.