Targets,tactics, and the open mouth face during play fighting in three species of primates

The play fighting of many mammals involves the nonserious use of behavior patterns derived from serious fighting. A major question of theoretical importance has been that of how, given this overlap in patterns of behavior, the animals can distinguish between playful and nonplayful intent. One proposed solution is that animals use play signals to inform each other about the playful intent of their actions. The most widely reported play signal amongst primates is the open mouth play face. The manner in which this so-called signal functions is based on correlational evidence, with most reports simply noting its presence or absence in a given species. This study involved a detailed video-based analysis of the occurrence of open mouths during the play fighting of three species of primates. One captive troop each of ring-tailed lemurs, black-handed spider monkeys, and patas monkeys was used. By examining all open mouths in the context of the species-typical style of play fighting, several conclusions were empirically verified. 1) Most open mouths occur as a functionally necessary precursor for biting. 2) Some open mouths occur as a defensive threat which deters further contact. 3) The residual open mouths which may function as contact promoting play signals, constituted about 20–25% of all open mouths by the lemurs and patas monkeys, but less than 5% for spider monkeys. These species differences appeared to arise from two causes. Firstly, the spider monkeys used another signal, the head shake, in situations where lemurs and patas monkeys used open mouths. Secondly, the style of play fighting greatly influenced the frequency and duration of open mouths. This was most marked in the face-to-face combat style of patas monkeys. These findings show that comparative studies of the occurrence and function of play signals need to take into account species-typical styles of playful combat. Aggr. Behav. 23:41–57, 1997. © 1997 Wiley-Liss, Inc.     

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.     

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。     

文章主题论述长度对文章标记效应的影响

探讨文章阅读过程中文章主题论述长度对文章主题信息和从属信息的保持效果。结果表明：文章主题论述长度影响着文章标记的效应,在有文章宏观标记条件下,文章主题论述长短对主题的通达无显著影响;但在无宏观标记条件下,论述长的文章主题的记忆效应显著优于论述短的主题;文章宏观标记对短主题从属信息的保持存在显著的扩散效应。     

文章主题的组织方式对文章标记效应的影响

以120名高中生为被试,探讨在有无文章标记条件下,文章主题的不同组织对文章主题信息和文章总命题信息保持的影响。结果表明,在文章主题信息的保持上,文章主题的组织方式和文章标记都有显著的主效应,但无显著的交互作用。在文章总命题信息保持上,文章主题的组织方式与文章标记之间存在显著的交互作用,文章标记对主题有组织文章的信息保持的促进效应大于对主题无组织文章的信息保持的促进效应。     

Intentional behaviour in dog-human communication: an experimental analysis of “showing” behaviour in the dog

Despite earlier scepticism there is now evidence for simple forms of intentional and functionally referential communication in many animal species. Here we investigate whether dogs engage in functional referential communication with their owners. “Showing” is defined as a communicative action consisting of both a directional component related to an external target and an attention-getting component that directs the attention of the perceiver to the informer or sender. In our experimental situation dogs witness the hiding of a piece of food (or a favourite toy) which they cannot get access to. We asked whether dogs would engage in “showing” in the presence of their owner. To control for the motivational effects of both the owner and the food on the dogs’ behaviour, control observations were also staged where only the food (or the toy) or the owner was present. Dogs’ gazing frequency at both the food (toy) and the owner was greater when only one of these was present. In other words, dogs looked more frequently at their owner when the food (toy) was present, and they looked more at the location of the food (toy) when the owner was present. When both the food (toy) and the owner were present a new behaviour, “gaze alternation”, emerged which was defined as changing the direction of the gaze from the location of the food (toy) to looking at the owner (or vice versa) within 2 s. Vocalisations that occurred in this phase were always associated with gazing at the owner or the location of the food. This behaviour, which was specific to this situation, has also been described in chimpanzees, a gorilla and humans, and has often been interpreted as a form of functionally referential communication. Based on our observations we argue that dogs might be able to engage in functionally referential communication with their owner, and their behaviour could be described as a form of “showing”. The contribution of domestication and individual learning to the well-developed communicative skills in dogs is discussed and will be the subject of further studies. Received: 3 April 2000 / Accepted after revision: 2 September 2000     

“Playing by the Book”: Determinants of Children's Preference for Replicating and Originating Play

Play is children's most important daily behavior and when children play, they do so in multiple ways. With two studies, this paper explores how children perceive a continuum of two play types, namely replicating play (in which models, guidelines, and examples are used to reach an intended result) and originating play (in which children create something from the mind, think freely about how they will play, are less restricted by given models, etc.). Study 1 (N = 56, M_age = 9) quantitatively shows that both play types occur and tests if children also describe the play types as we define them. Results show that children who play originating (vs. replicating) believe they follow less (vs. more) rules and do their own thing more (vs. less), which verifies the definitions of both types of play. Study 2 includes 16 in-depth semi-structured interviews (M_age = 10) and shows which determinants children identify as triggers for engaging in play that has more replicating or more originating elements.     

Choice for reinforced behavioral variability in children with autism spectrum disorder

Although individuals with autism spectrum disorder (ASD) tend to behave repetitively, certain reinforcement contingencies (e.g., lag schedules) can be used to increase behavioral variability. In a lag schedule, reinforcers only follow responses that differ from recent responses. The present study was designed to promote variable play behavior in preschoolers with ASD interacting with playsets and figurines and to assess preference for variability and repetition contingencies. Data have shown a preference for variability in pigeons and college students, but this effect has not been explored in clinical populations. In this experiment, preschoolers with ASD were taught to discriminate between variability and repetition contingencies. Only play behaviors that met a lag schedule were reinforced in the presence of one color, and only repetitive behaviors were reinforced in the presence of another. After differential performance was established, participants experienced a concurrent chains schedule. Participants chose between the colors taught in training and then completed a play session with the selected contingency. One participant selected variability and repetition equally. The other participants showed a slight preference for variability. These results indicate that some individuals with ASD may play repetitively, not because they prefer repetition, but because they require additional teaching to play variably.