Effects of food and mates on time budget in Aplysia fasciata: integration of feeding, reproduction, and locomotion

This study examines the time budgeted to different behaviors in Aplysia fasciata under three conditions: (1) animals have constant access to food and mates: (2) there is access to food, but not to mates; (3) neither food nor mates are present. The data suggest a number of rules underlying behavioral integration: (1) Feeding, reproductive behaviors, and activity seem to be natural categories for behavioral choice. Feeding and reproductive behaviors are controlled in tandem by a common arousal mechanism, while time left over after animals feed and reproduce is distributed in a fixed ratio between locomotion (crawling and swimming) and inactivity (immobility and movement in place). (2) Relative distribution between different forms of locomotion and inactivity is modified by changes in motivational state. More time is spent swimming than crawling when feeding and/or mating is prevented, while more time is spent moving in place than immobile when the arousal level is increased. (3) Feedback control of feeding and reproduction is asymmetric. Satiation of feeding inhibits the common arousal. In the absence of food, time spent on reproductive behaviors increases due to disinhibition of the common arousal. By contrast, positive feedback arising from sexual behavior excites the common arousal. When mating is prevented by removing potential mates, time spent feeding decreases. (4) Generally, animals choose between performing the three main categories of behavior. Although Aplysia simultaneously can feed and mate, or locomote and mate, they do so infrequently. By contrast, different types of reproductive behaviors (male mating, female mating, egg-laying) are commonly performed simultaneously.     

Common regulation of feeding and mating in Aplysia fasciata: pheromones released by mating and by egg cordons increase feeding behavior.

We examined whether pheromones released by reproductive behaviors (mating and egg-laying) affect feeding behavior. A preliminary experiment demonstrated that the quantity of food eaten can be used to measure the effects of pheromones on feeding. Using this measure, we then showed that Aplysia that were prevented from mating, but that were in the same aquarium as mating conspecifics, eat more food than do Aplysia in a medium lacking mating animals. Mating and feeding were not temporally correlated, indicating that pheromones released by mating probably do not initiate feeding, but rather modulate feeding after it has begun. Aplysia that were in the same aquarium as freshly deposited egg cordons also ate more than did animals in a medium lacking eggs.     

Daily variation of multiple behaviors in Aplysia fasciata: integration of feeding, reproduction, and locomotion

Daily variations in feeding, reproductive behaviors, and activity level were examined under three conditions: (1) animals had access to food and mates; (2) there was access only to food; (3) neither food nor mates were present. Behaviors differed in amplitude of variations from their daily mean value. Egg-laying had the strongest tendency to be clustered. Amplitude of variations in courtship and swimming was larger than those of immobility, crawling, and feeding, while moving in place was the least clustered behavior. Changes in state affected the tendency to be clustered. When food and mates were present, amplitude of variations became progressively larger for immobility, moving in place, crawling, and swimming. Behaviors differed in the degree to which variations were patterned as a 1/day oscillation. Relatively little of the variability in crawling, moving in place, courtship, and egg-laying was due to a 1/day oscillation under any condition. By contrast, a large proportion of the variability of immobility, swimming, mating, and eating was modulated by a 1/day oscillation in at least one condition. The contribution of a 1/day oscillation to variability differed in the conditions examined. For immobility and swimming, when food and mates were present, the 1/day component of variability became smaller. By contrast, presence of mates led to an increase in the 1/day component of variability modulating feeding. Daily peaks of swimming and feeding were in phase with one another, and out of phase with mating and feeding. The ratio of locomotion to inactivity is constant, independent of change in external conditions. However, this ratio varied throughout the day. When food and mates were absent, variations of immobility and swimming were strongly related to variations in the inactivity ratio. When food and mates were added, this tendency decreased. The data suggest that daily variations in occurrence of behaviors can be accounted for by interactions between oscillators affecting Aplysia behavior and motivational variables. A 1/day oscillator has strong effects on mating, swimming, and immobility. The effect of the oscillator is modified by changes in motivational state.     

Motivational control of sexual behavior in Aplysia fasciata: sequencing and modulation by sexual deprivation and by addition of partners

Variables similar to those affecting feeding behavior also modulate sexual behavior in Aplysia fasciata, indicating that mating is under motivational control. Motivated behaviors are often patterned into appetitive and consummatory components. Courtship, the appetitive phase of male sexual behavior, was temporally related to subsequent mating. Although many bouts of courtship failed to lead to mating, most incidents of mating were preceded by courtship. Motivation is also characterized by satiation after the goal of the behavior is achieved. We found an increase in likelihood to mate following a period of sexual isolation. Motivated behaviors are also modulated by environmental stimuli that induce arousal. Time spent mating was found to be a function of the number of potential mates accessible for mating. Number of A. fascinata participating in a mating group was also found to be a function of number of potential mates available.     

Does Familism Lead to Increased Parental Monitoring?: Protective factors for Coping with Risky Behaviors

We examined coping with risky behaviors (cigarettes, alcohol/drugs, yelling/ hitting, and anger), familism (family proximity and parental closeness) and parental monitoring (knowledge and discipline) in a sample of 56 adolescents (11–15 years old) predominantly of Mexican descent at two time points. Multiple linear regression analysis indicated that more time spent with family (proximity) at Time 1 significantly predicts higher parental monitoring at Time two. Coping with more risky behaviors at Time 1 was significantly associated with less parental monitoring at Time 2. More parental closeness Time 1, more parental monitoring Time 1, and more parental monitoring Time 2 were associated with less coping with risky behaviors at Time 2. The cultural value of familism, particularly spending time with family in positive activities, appears to increase parental monitoring which may lead to less coping with risky behaviors among Mexican descent adolescents. Future studies may investigate gendered mechanisms for how extended family may increase not only parental knowledge of youth activities, but also youth perception of supervision.     

Courtship, competition, and the pursuit of attractiveness: mating goals facilitate health-related risk taking and strategic risk suppression in women

Two experiments explored the possibility that specific health risks observed among young women may be influenced by attractiveness-enhancement goals associated with mating. Study 1 (n=257) demonstrated that priming women with intersexual courtship and intrasexual competition increased their willingness to go tanning and take dangerous diet pills. Study 2 (n=148) conceptually replicated these results and revealed that increased willingness to take these risks is mediated by diminished feelings of vulnerability to the negative health effects associated with these behaviors when mating goals are salient. Findings provide evidence that mating goals play a role in the continued popularity of these dangerous behaviors in women. Furthermore, the current results bridge the existing gap between health belief and self-presentational models of risk behaviors to yield novel insights into the psychology of risk taking.     

女性食物选择的演化视角：基于性选择过程的理论探讨

性选择在人类心理、行为等表型的演化过程中扮演了重要角色,但其对女性食物选择的影响却相对较少被关注。性选择塑造了男女不同的择偶策略,男性择偶时对女性外在吸引力的关注使得女性更加重视身材等外在吸引力信息。而女性身材与饮食的密切联系,进一步提示性选择过程应该会对女性的食物选择产生影响。以之为基础,梳理求偶动机激活可能引发的女性食物选择的变化,以及女性生理期不同阶段在食物选择上的变异,有助于了解性选择过程对女性食物选择的影响。未来研究中,进一步从行为、激素、脑等不同层面剖析对应影响及涉及机制,对该领域的长远发展有重要意义。     

Calories,beauty, and ovulation: The effects of the menstrual cycle on food and appearance-related consumption

The menstrual cycle has been largely ignored within the consumer research literature. Using a survey panel, women's food and appearance-related consumption was tracked for 35 consecutive days. As predicted, food-related desires, dollars spent, and eating behaviors were greater during the luteal (non-fertile) phase, whereas appearance-related desires, dollars spent, and beautification behaviors increased during the fertile phase. Dollars spent on products unrelated to food or beautification were not significantly influenced by the menstrual cycle. Hence, women's consumption desires, preferences, and dollars spent in evolutionarily relevant product categories (food and mating) fluctuate across their ovulatory cycle. Branding-related implications are briefly discussed.     

Influences of parent and child negative emotionality on young children's everyday behaviors

Negative emotionality is linked to unfavorable life outcomes, but studies have yet to examine negative emotionality of parents and children as predictors of children's problem behaviors and negative emotion word use in everyday life. This study used a novel naturalistic recording device called the Electronically Activated Recorder to investigate the separate and interactive influences of parent and child negative emotionality on daily child behaviors in a sample of 35 preschool-aged children over two time points separated by 1 year. Fathers' negative emotionality predicted children's whining at Time 1; mothers' negative emotionality predicted children's negative emotion word use at Time 1 and increases in children's arguing/fighting from Time 1 to Time 2. Parents' ratings of child negative emotionality also were associated with increases in children's arguing/fighting from Time 1 to Time 2, and child negative emotionality moderated the association between mothers' negative emotionality and children's arguing/fighting. Further, children with mothers high in negative emotionality displayed higher levels of problem behaviors when their mothers self-reported low levels of positive emotional expressiveness and/or high levels of negative emotional expressiveness. These findings offer preliminary evidence linking parent and child negative emotionality to everyday child behaviors and suggest that emotional expressiveness may play a key role in moderating the links between maternal negative emotionality and child behavioral problems. (PsycINFO Database Record (c) 2012 APA, all rights reserved).     

Stability of aggressive behaviors and children's peer relationships

The present research longitudinally evaluated the association of group and dyadic peer relation factors to the stability of aggression. Beginning in grades 2 through 5, children (N = 212) completed peer nominations for aggressive behaviors, sociometric ratings, sociometric nominations (like most and like least), and friendship nominations for 2 successive years. Children were classified into four Stability of Aggression Groups: Never Aggressive, Stable Aggressive, Discontinued Aggression, Became Aggressive. Aggressive children were evaluated as more disliked at each time of testing (i.e., Stable Aggressive and Discontinued Aggression at Time 1; Stable Aggressive and Became Aggressive at Time 2). Furthermore, sociometric ratings of children at Time 1 who became aggressive by Time 2 foreshadowed this transition. Children who discontinued aggressive behaviors were friends with children who were evaluated by peers as significantly less aggressive than the friends of children who continued aggressive behaviors. These findings suggest that early identification of children at risk for developing aggressive behavior may be possible through group‐level peer evaluations, and identification of those at risk for continuing aggressive behavior may be possible through the evaluation of special dyadic friendships. Aggr. Behav. 26:277–290, 2000. © 2000 Wiley‐Liss, Inc.     

Prosocial behavior is related to later executive function during early childhood: A longitudinal study

ABSTRACT

Previous research has shown that executive function is correlated with prosocial behavior during early childhood. Whether early prosocial behaviors were associated with later executive function during preschool years or vice versa was thus examined in a longitudinal design. The prosocial behaviors and executive function of children (N = 64) aged 42 to 65 months were evaluated twice (Times 1 and 2), based on teachers’ reports and children’s performance on hot and cool executive function tasks. Results revealed that prosocial behaviors at Time 1 were associated with later hot executive function at Time 2, but executive function at Time 1 was not related to prosocial behaviors at Time 2. These findings suggest that prosocial behaviors may enhance children’s hot executive function.     

Sequencing of behaviors in Aplysia fasciata: integration of feeding, reproduction, and locomotion.

To begin studying the neural basis of higher-order decision-making in Aplysia fasciata, we examined individual bouts of behavior in various conditions of access to food and/or mates. We then determined rules governing transitions between bouts. The data indicate that a single intermediate condition, moving in place, may be centrally related to transitions between behaviors. In all conditions, over 85% of all transitions between behaviors were via moving in place. Moving in place tended to precede and follow other categories of activity (crawling, swimming, immobile), and feeding. Also, moving in place apparently represents a fixed proportion of all bouts of behavior. In each condition, moving in place represented approximately 40% of all bouts, while the number of bouts of other behaviors varied markedly. After a bout of moving in place there was a strong tendency for the animal to return to the behavior performed before moving in place. Additional preferred sequences of behavior were also seen. Courtship tended to precede mating, and crawling preceded swimming.     

Activity patterns and time budgeting of Aplysia fasciata under field and laboratory conditions

Activity patterns of Aplysia fasciata were observed in a protected port environment and in an aquarium. In both, major activities were feeding and mating, which collectively took up about 45% of the total time of the animals. Active behaviors occurred primarily at night; much of the day was spent in the inactive state. Activities were highly synchronized, with large numbers of animals performing the same behaviors simultaneously at a specific time. Mating and eating occurred primarily at different times; relatively few animals were observed performing these behaviors simultaneously. Many animals laying eggs were simultaneously mating as females.     

时间洞察力特质对食品选择偏好的影响:解释水平对内隐偏好的作用

探索两类时间洞察力特质个体外显与内隐食物选择偏好。实验1用《津巴多时间洞察力问卷》选出"现在享乐"和"未来定向"两类个体,考察其外显食物选择偏好,结果发现,与"未来定向"组相比,"现在享乐"个体选择更多垃圾食品。实验2中,两类个体分别接受不同的解释水平操作,之后完成单靶内隐联想测验,以考察其对垃圾食品的内隐态度,并检验解释水平的调节作用。结果发现,与未来定向组相比,现在享乐组对"垃圾食品"存在内隐偏好。此外,对现在享乐者,解释水平改变会对食物选择偏好有显著影响;而对未来定向者,其影响不显著。这表明与未来时间定向者比,现在享乐者在外显、内隐层面对"垃圾食品"有选择偏好,并且解释水平会通过改变心理距离对其内隐选择偏好产生影响。     

The role of urgency in maladaptive behaviors

Prior work on maladaptive behaviors has cited impulsivity as a risk factor. The concept of impulsivity, however, fails to address the potential role of negative affect in such behaviors. The UPPS Impulsive Behavior Scale addresses this weakness by dividing impulsivity into four subscales: Urgency, Sensation Seeking, (lack of) Premeditation, and (lack of) Perseverance. We predicted that urgency, defined as the tendency, specifically in the face of negative affect, to act quickly and without planning, would predict elevations on three maladaptive behaviors—excessive reassurance seeking, drinking to cope, and bulimic symptoms as measured by the Eating Disorder Inventory—in both cross-sectional and longitudinal analyses in an undergraduate sample (N=70). Participants were assessed at two time points, 3–4 weeks apart. Urgency significantly predicted all three outcome variables cross-sectionally at both Time 1 and Time 2. Time 1 urgency significantly predicted Time 2 excessive reassurance seeking. Changes in urgency from Time 1 to Time 2 predicted changes in all three outcome variables. Results indicate a clear cross-sectional relationship between urgency and certain maladaptive behaviors. Additionally, some form of longitudinal relationship may exist between these variables, although the use of residual change scores precluded distinction between true change and change due to error.     

危机情景下的亲社会行为：求偶动机对危机救助意愿的影响

危机救助指冒着生命危险去保护和拯救他人,这种行为多见于男性,但无法用进化论的个体选择观点解释。本研究基于进化心理学中代价信号理论,探索启动求偶动机对个体在危机情境下的冒险救助意愿的影响。结果表明,启动择偶动机会导致男性的危机救助意愿上升;而女性的危机救助意愿则在启动择偶动机后下降。这一结果支持如下观点：男性在危机情境下冒险救助的行为是一种代价信号行为,具有为吸引异性这一目标服务的功能。     

情绪对饮食行为的影响

人类的饮食行为受到诸多因素的影响, 包括生理因素、心理因素及社会文化因素等, 其中情绪对饮食行为的影响日益受到研究者的重视, 这种影响一般表现为摄入量的多少和食物(热量)的选择。通过探讨不同情绪下临床和非临床个体食物摄入量的表现, 总结发现消极情绪导致个体暴饮暴食的可能更大。积极情绪影响下的饮食行为的研究结果则存在分歧: 生理角度解释为积极情绪能够促进个体的享乐机制, 导致进食行为增加; 而自我控制理论则认为积极情绪增加了个人资源以抵制美食诱惑。此外, 进一步探讨了情绪影响下饮食行为的神经生理机制。未来在饮食相关的临床研究和治疗上, 需要对情绪影响下的饮食行为有更深入的神经机制方面的探究。     

The value of job crafting for work engagement,task performance,and career satisfaction: longitudinal and quasi-experimental evidence

We examine how job crafting (i.e. seeking resources, seeking challenges, decreasing demands) increases the person-job fit of employees. In Study 1, we studied job crafting’s effects over time. 111 employees filled out a questionnaire at two time points with 6 months in between. We found that seeking resources behavior at Time 1 positively affected work engagement, task performance, and career satisfaction at Time 2. Decreasing demands at Time 1 negatively affected work engagement, task performance, and career satisfaction at Time 2. In Study 2, we tested a job crafting intervention using a quasi-experimental design (i.e., intervention group, N = 60, and a control group, N = 59). The intervention was successful, as participants in the intervention group increased seeking resources and decreasing demands behaviors. Furthermore, seeking resources behavior was the main driver of increased participants’ work engagement, task performance, and career satisfaction.     

Using implicit attitudes of exercise importance to predict explicit exercise dependence symptoms and exercise behaviors

Objectives“Fast” (i.e., implicit) processing is relatively automatic; “slow” (i.e., explicit) processing is relatively controlled and can override automatic processing. These different processing types often produce different responses that uniquely predict behaviors. In the present study, we tested if explicit, self-reported symptoms of exercise dependence and an implicit association of exercise as important predicted exercise behaviors and change in problematic exercise attitudes.DesignWe assessed implicit attitudes of exercise importance and self-reported symptoms of exercise dependence at Time 1. Participants reported daily exercise behaviors for approximately one month, and then completed a Time 2 assessment of self-reported exercise dependence symptoms.MethodUndergraduate males and females (Time 1, N = 93; Time 2, N = 74) tracked daily exercise behaviors for one month and completed an Implicit Association Test assessing implicit exercise importance and subscales of the Exercise Dependence Questionnaire (EDQ) assessing exercise dependence symptoms.ResultsImplicit attitudes of exercise importance and Time 1 EDQ scores predicted Time 2 EDQ scores. Further, implicit exercise importance and Time 1 EDQ scores predicted daily exercise intensity while Time 1 EDQ scores predicted the amount of days exercised.ConclusionImplicit and explicit processing appear to uniquely predict exercise behaviors and attitudes. Given that different implicit and explicit processes may drive certain exercise factors (e.g., intensity and frequency, respectively), these behaviors may contribute to different aspects of exercise dependence.     

班主任协商管理行为、师生关系与小学4~6年级学生外化问题行为的相互作用关系：交叉滞后研究

为探讨班主任协商管理行为、师生关系和学生外化问题行为三者间的相互作用关系, 在1个学年中, 采用问卷法对1407名小学4~6年级学生进行3次追踪测量。交叉滞后分析结果表明：(1)班主任协商管理行为启动积极的相互作用过程, T1时的班主任协商管理行为能显著减少T2时的学生的外化问题行为、提升T2时的师生关系亲密和降低T2时的师生关系冲突, 进而显著影响T3时的班主任协商管理行为、师生关系和学生外化问题行为; (2)学生外化问题行为驱动消极的相互作用过程, T1时的学生外化问题行为能显著减少T2时的班主任协商管理行为、降低T2时的师生关系亲密和增加T2时的师生关系冲突, 进而显著影响T3时的学生外化问题行为、师生关系和班主任协商管理行为。研究结果支持动态相互作用模型, 提示班主任在警醒学生外化问题行为的负面驱动作用的同时, 可有意识地利用协商管理行为的积极驱动作用干预学生的外化问题行为。