6 
The cortex is not necessary for rats to engage in play fighting, but it is necessary for them to modify their pattern of play fighting in different contexts. Two experiments were conducted to determine the role of the motor cortex (MC). Rats with bilateral ablations of the MC performed on Postnatal Day 10 failed to […]
6 
Many types of animal behaviour, especially seemingly complex social interactions, have been attributed to the existence of complex cognitive mechanisms. Indeed, as specific behaviours are analysed in greater and greater detail, the increasing number of minor variations observed seem to necessitate the operation of increasingly powerful computational devices. An alternate view, inspired by cybernetic theory, […]
6 
With the onset of puberty, play fighting in rats decreases in frequency and the tactics of attack and defense that are used are rougher. Previous studies have shown that the changes in the frequency of play and in the use of defensive tactics arise independently of social experience. Furthermore, while the former involves subcortical regulation, […]
6 The frequency of playful attack and the style of playful defense, are modifiable by gonadal steroids and change after puberty in male and female rats. The present study examined the play behavior exhibited by testicular feminized mutation (tfm)-affected males, who are insensitive to androgens but can bind estrogens aromatized from androgens, to determine the relative […]
5 
Although play fighting has been studied for over a century in both human and non-human animals, quantitative data on marine mammals are still scarce. Here, we investigated play fighting in South American sea lions (Otaria flavescens), one of the most sexually dimorphic species with an extreme polygynous mating system, high levels of both intra- and […]
6
play fighting in juvenile rats is associated with a high occurrence of 50 kHz vocalizations. These calls are varied in form, ranging from long, flat calls to short, frequency-modulated ones. We hypothesize that at least some types of calls serve as play signals to facilitate play. In the present study, pairs of juvenile male rats […]
5 
Work-themed play may allow children to learn complex skills, and ethno-typical and gender-typical behaviors. Thus, play may have made important contributions to the evolution of childhood through the development of embodied capital. Using data from Aka foragers and Ngandu farmer children from the Central African Republic, we ask whether children perform ethno- and gender-typical play […]
5 
Play behaviour reinforces social affiliation in several primate species, including humans. Via a comparative approach, we tested the hypothesis that play dynamics in a group of lowland gorillas (Gorilla gorilla gorilla) are different from those in a group of chimpanzees (Pan troglodytes) as a reflection of their difference in social affiliation and agonistic support. We […]
5 
Autism spectrum disorder (ASD) is a prevalent childhood disorder as 1 in 68 children, 8 years old and younger, are diagnosed with ASD. Additionally, childhood trauma impacts 60% of children living in the United States. Due to the lack of social awareness and increased sensitivity to various stimuli, children diagnosed with ASD are often more […]
5 
Pretend play is often considered to be an imaginative or creative activity. Yet past experimental research has focused on whether children imitate pretense, follow instructions to pretend, or understand others’ pretense. Thus, we cannot be sure that children’s pretense is in fact novel or whether children simply copy or follow others’ instructions. This is the […]
5
The primate play-face is homologous to the human facial display accompanying laughter. Through facial mimicry, the play-face evokes in the perceiver a similar positive emotional state. This sensorimotor and emotional sharing can be adaptive, as it allows individuals to fine-tune their own motor sequences accordingly thus increasing cooperation in play. It has been recently demonstrated […]
5 
Rats (Rattus norvegicus) emit a variety of ultrasonic vocalizations throughout their lifespan that reflect different forms of emotional arousal and accompanying affective states. In this study, high frequency recordings of ultrasonic vocalizations were made during mating, aggression, and both conspecific and heterospecific (dubbed “tickling “) rough-and-tumble play behavior. We found that frequency modulated 50-kHz calls […]
5 Octodon degus is a social caviomorph species that exhibits strong social bonds and robust distress responses to maternal separation. To understand the impact of early social isolation on social motivation, we investigated how social isolation during infancy, associated with repeated restricted interactions with mother and siblings, altered social motivation in young degus. In Experiment 1, […]
5 
The social meanings of play sit at odds with norms of responsible and productive adult conduct. To be “caught ” playing as an adult therefore risks embarrassment. Still, many designers want to create enjoyable, nonembarrassing play experiences for adults. To address this need, this article reads instances of spontaneous adult play through the lens of […]
5
Some comments are appended to Patrick Bateson’s reflections on the future of behavioral biology that were triggered by remembering the contributions of G¸nter Tembrock to ethology. While the suggestions made are valid and insightful, a few specific areas where exciting research possibilities may reside are added including those involving communication and language, culture and ritual, […]
5
Rat ultrasonic vocalizations have been suggested to be either a byproduct of physical movement or, in the case of 50-kHz calls, a means to communicate positive affect. Yet there are up to 14 distinct types of 50-kHz calls, raising issues for both explanations. To discriminate between these theories and address the purpose for the numerous […]
5 
During playful interactions, juvenile rats emit many 50-kHz ultrasonic vocalizations, which are associated with a positive affective state. In addition, these calls may also serve a communicative role – as play signals that promote playful contact. Consistent with this hypothesis, a previous study found that vocalizations are more frequent prior to playful contact than after […]
5 
The results are presented from a systematic review of the literature that examined findings of published studies about play-based interventions for children and youth with ADHD. Guided by the research question, “What is the current status of evidence for using play-based interventions to improve outcomes for students with ADHD?, ” this study evaluated methodological quality […]
5 
play fighting in rats involves attack and defense of the nape. To protect the nape, rats use a variety of defensive tactics, with different strains having specific preferences. Targeting of the nape is established before weaning and defense matures over the course of the week preceding and the week proceeding weaning. Thus, it is possible […]
4 
There has been a perennial debate about whether aggression is learned or innate. The power of extreme arguments in this area has diminished as all are beginning to recognize that both evolution and learning contribute much to our tendency to be aggressive in various distinct ways, including impulsive anger, premeditated predatory behavior in its many […]
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