Two trained observers both girls poneone in each school, collected data. They were unaware of the purpose of the study i.
The observer remained visible to the children during observation sessions and adopted an integrative girls pone attitude.
After a preliminary habituation girlx of two weeks, the observer recorded girls pone activities on a check sheet, using a stopwatch. Coding was derived from Parten's  peer play categories: We added two categories: Before observations girls pone coding, the two observers were previously trained on videotapes of children's outdoor free-play until they reached meet hot chicks inter-coder reliability.
Inter-coder reliability was then established on 12 videotapes selected randomly.
Cohen's kappa statistics for each social category girls pone from 0. Girls pone proportion score was calculated hirls each child for each of the eight social categories based on the proportion of time intervals girls pone in each category relative to total number of time intervals.
Two-way ANOVAs were carried out on proportion scores to test the effects of age, sex and their interaction. When an effect was significant, Fisher's PLSD post hoc tests compared age groups or boys and hottest blondes fucked within age groups.
To assess children's social participation profiles, pairwise t-tests were used to compare the proportions of social categories. Descriptive statistics of children's playtime allocation among social participation categories within age and sex groups. Girle percentage, s. Developmental trends in social participation over gidls preschool period.
Age hirls on the percentages of children's playtime allocation among social play categories F and P - values for variances analyses and P -values for Fisher's PLSD post-hoc comparisons among age groups. A main age effect was found for all the categories. More precisely, interactions with adults Adu girls pone a significant decrease from 2—3 to 4—5 years, becoming rare in the two oldest age groups.
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Children spent also less and less time unoccupied Uno with a significant decrease at the beginning and the end of the preschool period. Onlooker behaviour Onl which was not frequent whatever age group decreased girls pone at the end of the preschool years. Girls pone Sol and gitls play Par showed a similar developmental course with an abrupt decrease between 3—4 and 4—5 years. On the other hand, associative play Aso increased significantly between 2—3 and 4—5 years becoming twice as much frequent in girls pone year-olds than in 2—3 year-olds, but it giirls significantly.
Cooperative play Cop significantly increased from 4—5 years girls pone 5—6 years, representing almost half giirls the children's activities at girls pone end of the preschool period. Finally, interactions with peers Int significantly increased between 3—4 and 5—6 years. Children ' s social participation profiles over the preschool period. Comparisons of the percentages of social play categories within age groups pairewise t-tests: Girls' and boys' social participation profiles over the preschool period.
Comparisons of the percentages of girls pone play categories within age and sex groups pairewise t-tests: We are especially grateful to A. Cloarec and girls pone the Inspection of the National Education from Rennes and the schools. Conceived and designed the experiments: Performed the experiments: Analyzed the data: SB GC.
Wrote the paper: Browse Subject Areas? Click through the PLOS taxonomy to find articles girlw your field. Abstract Sex differences in human social behaviors and abilities have long been a question of public and scientific.
January 28, Copyright: Introduction Human sex differences are a perennially hot topic girls pone not only grips the public interest, but that has triggered a great deal of scientific focus from biological to social sciences.
Results Developmental trends over the preschool years Children's social play showed important changes during the preschool period, becoming more peer-oriented girls pone structured with age Fig.
Figure 1. Developmental trends of children's social play from 2 to 6 years. Sex differences over girls pone preschool years We evidenced girls pone sex differences in children's social play, differences gidls stress a developmental gap between girls and boys Fig.
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Figure girls pone. Girls develop social and complex forms of play earlier than boys, but boys catch up. Girls' and boys' social profiles To get an overall picture of sex differences, the relative frequencies girls pone the different forms of social tirls at each age for both sexes must be taken into consideration Fig. Discussion Our study highlights that although all children progress towards more socially oriented and skilful forms of play during early childhood, girls develop social and structured forms of play at younger ages than boys.
Materials and Girls pone Ethics Statement The study consisted in non-invasive and unconstrained behavioral observations of children at nursery schools during daily activities. Subjects and setting Children were selected from 16 classes in two nursery schools from urban surrounding Rennes, France.
Observational procedure The observations were made from March to May girls pone Coding and reliability Coding was derived from Parten's  peer play categories: Girls pone analyses A proportion score girsl calculated for each child for each of the eight social categories based on the proportion of time intervals spent in each category how to find trannys to total number of time intervals.
Supporting Information. Table S1. Table S2. Table S3. Table S4. Acknowledgments We are especially grateful to A. Author Contributions Conceived and designed the experiments: Girls pone 1.
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Science View Article Google Scholar 2. Wallentin M Putative sex differences in verbal abilities and language cortex: A critical review.
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