‘Mommy,You are the Princess and I am the Queen’: How Preschool Children's Initiation and Language Use During Pretend Play Relate to Complexity

The present study investigated the relationship between complexity of pretend play, initiation of pretense activities, and mental state utterances used during play. Children 3 to 4 years of age were videotaped while engaging in pretend play with a parent. The videotapes were coded according to mental state utterances (i.e. desire, emotion, cognitive, and modulations of assertion), and pretend play complexity (i.e. interaction with parent, object use, theme, and role transformation). Children who initiated the pretend activities exhibited more complex play behaviours than those whose parents initiated the activities. Children's increased use of cognitive mental state terms was related to increased pretend play complexity, while parents' increased use of cognitive terms was related to decreased levels of complexity. The results provide support for using a guided participation approach to interacting with preschool children to enhance independence and complexity in play. Copyright © 2015 John Wiley & Sons, Ltd.     

Differences in Theory of Mind and Pretend Play Associations in Children with and Without Specific Language Impairment

Children with specific language impairment (SLI) have difficulty engaging in social pretend play, which cannot be explained exclusively by their deficient language skills. Alternatively, the ability to represent mental states (Theory of Mind [ToM]) might be important in appreciating peers' perspectives during pretend play. This study investigated whether ToM was associated with pretend play abilities in children with and without SLI. Forty‐four children (22 with SLI, 22 with typical development [TD]) between 4 and 6 years of age participated in ToM tasks and a dyadic role play activity. Children with SLI performed significantly more poorly on ToM tasks than children with TD; however, there were no significant group differences in children's role play abilities. Partial correlations revealed a positive and significant association between ToM and social pretend play in children with TD but a negative and not significant association in children with SLI. These findings suggest that not all forms and aspects of pretend play require mental representation in order to understand or engage in pretend play. Further, children with SLI may differ in their mental representational abilities from children with TD. Copyright © 2015 John Wiley & Sons, Ltd.     

The organization of play fighting in the grasshopper mouse (Onychomys leucogaster): Mixing predatory and sociosexual targets and tactics

The body targets contacted, the type of contact made, and the patterns of defense and counterattack elicited by those attacks are examined in the play fighting of captive male and female pairs of grasshopper mice. The nape was the most frequently contacted body target, irrespective of the type of contact made, be it nosing, allogrooming, biting, or striking with a forepaw. The types of defense varied with both body area contacted and type of attack performed. Based on the topography and pattern of contact, it was concluded that grasshopper mice, as is the case for many other muroid rodents, primarily attack and defend targets otherwise contacted during precopulatory encounters. However, grasshopper mice, which are obligate carnivores, also attack and defend predatory targets, although less frequently than sociosexual targets. Surprisingly, predatory attacks were more likely to be counterattacked with predatory attacks, whereas sociosexual attacks were more likely to be counterattacked with sociosexual attacks. Conspecific aggression involves bites directed at the face, lower flanks, and dorsum. Neither the biting of these areas nor the tactics of attack and defense usually associated with such bites were observed during the juvenile interactions. There were no sex differences in either frequency or patterns of attack and defense in play fighting. The data presented for grasshopper mice shed light on the issue of mixing behavior patterns from multiple functional systems during play. Aggr. Behav. 26:319–334, 2000. © 2000 Wiley‐Liss, Inc.     

The Riddle of Laughter: Neural and Psychoevolutionary Underpinningsof Joy

Modest advances are being made in understanding the neurology and functions of laughter. The discovery of tickle-induced "laughter" in animals should facilitate the characterization of this basic emotional response of the mammalian brain. The existence of such vocal activities in species other than humans (e.g., rats) suggests that the fundamental brain processes for joyful affect may have emerged early in vertebrate brain evolution. Here, I summarize the little that we know about the evolutionary and brain sources of laughter, and how the accompanying positive emotions may solidify social bonds within the mammalian brain. Discovery of unique neurochemistries that specifically promote laughter and joy may provide clues for development of new classes of antidepressants.     

Social and individual factors modulate parent-infant interactions: Lessons from free play sessions in an Argentine sample

In this study, we aimed to explore the associations between socioeconomic status (SES) (i.e., parents’ education and occupation, quality of the home and overcrowding), temperament styles (i.e., surgency, negative emotionality and regulatory capacity) and early dyadic and triadic nonverbal communication behaviors. We recruited 60 mother-infant dyads (mean age: 10.89 months, range: 9–13 months) low-to-mid SES, and assessed the duration of their communication behaviors using the Bakeman and Adamson (1984); SES was measured using INDEC Scale (2001), and temperament was assessed using the Infant Behavior Questionnaire-Revised Very Short Form (IBQ-R VSF, Putnam et al., 2014). Results showed that SES and their subdimensions were positively associated with passive, coordinated joint engagement (coordinated attention to person and object) and surgency, and negative with infant passive observation. Also, there were positive correlations between negative emotionality and unengaged attention behavior. We conclude that SES contributed to parent-infant interactions and temperament style from early months of life. We interpret these findings in relation to early intervention approaches aimed at promoting cognitive and social development.     

Neonatal testosterone augmentation increases juvenile play fighting but does not influence the adult dominance relationships of male rats

Neonatal male rats were either injected subcutaneously with testosterone propionate (TP) or oil vehicle. When weaned, each treated pup was paired with an untreated male sibling. The play fighting of TP-and oil-treated rats were compared at the juvenile phase (30–36 days), and in adulthood (84–90 days). In the juvenile phase, the rate of initiating playful attacks was significantly greater for TP-treated rats. Playful defense in response to such attacks did not differ between TP- and oil-treated rats. At the completion of the study, cortical thickness was measured for all the groups of rats. Oil treatment decreased overall cortical thickness relative to untreated pairmates, whereas TP treatment did not. Both oil and TP treatment abolished the asymmetry in hemispheric thickness, which was present in the untreated pairmates. The reversal of at least one of these injectioninduced changes in the cortex by TP provided independent evidence for the effectiveness of the TP treatment. As adults, neither the TP treatment nor the oil treatment influenced which pairmate became dominant. Dominance was judged by which pairmate initiated less playful attacks. Therefore, it is concluded that the early neonatal testosterone surge is not likely to be a factor in influencing the behaviors that lead to adult dominance. In contrast, play fighting is influenced by hormonal events in this early neonatal phase. It thus appears that play fighting and the aggressive systems subserving dominance relationships are differentially controlled. © 1992 Wiley-Liss, Inc.     

Juvenilized play fighting in subordinate male rats

As pairs of male juvenile sibling rats that are housed together become sexually mature, they develop a dominance-subordinance relationship. These dominance relationships appear to be reflected in the play fighting of the pairmates both as juveniles and as young adults, in that the seemingly subordinate partner initiates more playful attacks at both ages. However, as adults, even though it is the subordinate that initiates more playful attacks, it is the subordinate that is pinned on his back by the partner most often. Dominant pairmates were found to switch to defensive patterns typically found in adult males. In contrast, the subordinates, when contacted on the nape, were more likely to retain the juvenile pattern of turning over to supine. Therefore, the subordinate pairmate of an adult pair of male siblings both initiates more playful attacks and defends itself in a more juvenile manner than its dominant partner, and this leads to it being pinned more frequently. This pattern of behavior by subordinate rats is suggested to function as a friendship maintenance mechanism permitting co-existence in multimale colonies.     

Effects of an adult's presence on the social behavior of preschool children

The social behavior of same-sex pairs of nursery school children was observed during two ten-minute play sessions. One half of the pairs played alone during both sessions, and the remaining pairs played in the presence of a passive adult supervisor. Child pairs who played alone were significantly less aggressive and exhibited a moderate but nonsignificant increase in the expression of positive or prosocial behaviors. Unsupervised pairs also tended to verbalize more and engaged in significantly more cooperative play. The absence of adults may encourage children to employ more mature social strategies to achieve a successful relationship with their playmates.     

融于教学的游戏训练对农村大班幼儿执行功能的促进

本研究采用实验组对照组前测后测设计,对实验组（即干预组）幼儿进行为期3个月的融于教学的多种形式游戏训练（自控力养成、专注力练习、记忆棋游戏）。结果发现：(1)两组幼儿在执行功能的三个维度（工作记忆、抑制控制和认知灵活性）上的前测成绩均无显著差异,但训练后干预组幼儿在认知灵活性上的增量显著高于对照组,工作记忆上的增量略高于对照组;(2)将干预组幼儿依据执行功能水平进行高、低分组划分,发现低执行功能组在三个维度都得到了显著提升,而高执行功能组在工作记忆和抑制控制两个维度上有所提升。研究证明,短期游戏训练一定程度上可以促进农村幼儿执行功能的进步,尤其对执行功能偏低的幼儿效果更佳,显示出补偿发展的特征。     

A group‐randomized evaluation of a theatre‐based sexual abuse prevention programme for primary school children in Germany

The study reports a group‐randomized trial of a theatre‐based intervention to prevent sexual abuse targeting first and second grade primary school children in Germany. A sample of 148 first and second graders saw a live performance of a play designed to promote skills in dealing with abuse‐prone interactions with adults, watched a recording of the play on DVD or were assigned to a no intervention control group. Both the live performance and the DVD groups showed significant increases in the target variables (distinguishing good/bad touch and secrets, getting help, rejecting unwanted touch) from baseline to post‐intervention and a follow‐up after 2 weeks, while the control group did not show changes. The live performance and DVD groups participated in a further follow‐up 30 weeks post‐intervention, which showed sustained effects of the intervention. The findings indicate that with appropriately culture‐sensitive measures, sexual abuse prevention programmes can have sustainable effects with young primary school children. Copyright © 2009 John Wiley & Sons, Ltd.