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The relations linking aggressive to soc behavior are particularly strong when one considers the release & the control of aggressive behavior. The stimuli which provoke aggressive behavior nearly always come from outside; they are connected with the presence of a congener. One may assume that the stimuli & perceptions which enter into individual recognition have some connection with the triggering of aggressive. behavior ior. In mammals & esp in rodents, the role of olfactive cues has been stressed in a great many studies. In M mice, a great deal of individual recognition seems to depend on scent signals originating either in the genito-urinary region or in the urinary tract. The release of aggressive conducts is linked to similar olfactive cues: anosmia provokes a total disappearance of aggression in M mice. The role of the soc environment in the control of aggressive behavior can be studied by changing the density of pop. In natural conditions, the soc life tends to reduce aggressiveness; much animal behavior is directed towards developing exchange of information to reduce intra-specific fightings. But when M mice, for example, are isolated, their aggressiveness is increased; this phenomenon has been found in other animals & in man. In the same way, overcrowding increases aggressiveness in animals. Psychol'ts & physiologists have studied some of the internal changes involved by modification of the soc environment. In rodents, olfactive cues are also involved in these phenomena. AA.

Overactivity and aggressive, destructive behavior in children are often regarded as precursors of juvenile delin quency. This symptomatology is nonspecific for diagnosis or causation. Review of typical cases shows the wide range of meanings such behavior may have and the varied backgrounds, in a causal sense, from which such children may come. If delinquency is to be reduced or prevented, more will have to be learned scientifically about this whole subject. Both clinical workers and the general public will have to revise their atti tudes toward and their ways of dealing with aggressive children.

Distinctions are considered necessary for defining diff types of aggressive behavior. The term should be restricted to behavior directed toward causing physical harm to others. It is noted that 'there are some who argue that aggressive behavior defined in the narrow sense of behavior likely to cause physical injury to others is a desirable human characteristic. Such arguments rest on loose thinking.' The ways in which aggressive behavior is related to other types of behavior is an open issue. It is held that it is not useful to picture aggressive behavior as depending on instinctive energy, which could be directed into other channels. But the propensity to aggression can be traced to certain types of causal factors operating both earlier in life to affect the propensity to aggression, & in the immediate precipitation of an aggressive episode. Understanding of these factors can lead to suggestions as to how aggression can be reduced, eg, reduction in crowding, in frustration, improved conditions of rearing, etc. If aggression is reduced, other constructive types of activity become possible. Detailed res on whether or not a particular type of experience affects the subsequent propensity to aggression is needed. Modified Author's Summary.

Purpose
– Adolescent aggressive behavior has generated concern about/increasing rates of youth violence in schools. It is important to perform new research using different methods and approximations to obtain a better understanding of this multifactorial phenomenon. A poorly studied area consists of the presence of seasonal differences in adolescent aggressive behavior. Accordingly, several studies (with contradictory results) have found that adult aggressive behavior varies according to seasonality. The purpose of this paper is to use observational descriptive methods to analyze, during different seasons, adolescent aggressive behavior among students in schools of Santiago de Chile.


Design/methodology/approach
– In all, 32 aggressive interactions between dyads of male adolescents (14-18 years) were recorded using observational methods (i.e. ethological methodology) in a complete academic class in two schools from Santiago de Chile. Subsequently, the paper constructed intensity aggressive indexes based on behavioral data.


Findings
– The first contact, initiating aggressive interaction, and the aggression frequency were higher during warm season (i.e. spring) rather than cold season (autumn-winter). The aggression intensity of the complete interaction was higher during cold season. In addition, temperature was negatively associated to aggression intensity.


Originality/value
– These results, apparently contradictory, can serve to support classic models used to explain seasonal differences in aggressiveness, where the intensity of the first aggression could be the mediator of aggressiveness intensity in the interaction. Finally, the paper proposes that seasonal differences must be taken into account as an impact factor over the frequency of adolescent male aggression in schools.

Purpose -- Adolescent aggressive behavior has generated concern about/increasing rates of youth violence in schools. It is important to perform new research using different methods and approximations to obtain a better understanding of this multifactorial phenomenon. A poorly studied area consists of the presence of seasonal differences in adolescent aggressive behavior. Accordingly, several studies (with contradictory results) have found that adult aggressive behavior varies according to seasonality. The purpose of this paper is to use observational descriptive methods to analyze, during different seasons, adolescent aggressive behavior among students in schools of Santiago de Chile. Design/methodology/approach -- In all, 32 aggressive interactions between dyads of male adolescents (14-18 years) were recorded using observational methods (i.e. ethological methodology) in a complete academic class in two schools from Santiago de Chile. Subsequently, the paper constructed intensity aggressive indexes based on behavioral data. Findings -- The first contact, initiating aggressive interaction, and the aggression frequency were higher during warm season (i.e. spring) rather than cold season (autumn-winter). The aggression intensity of the complete interaction was higher during cold season. In addition, temperature was negatively associated to aggression intensity. Originality/value -- These results, apparently contradictory, can serve to support classic models used to explain seasonal differences in aggressiveness, where the intensity of the first aggression could be the mediator of aggressiveness intensity in the interaction. Finally, the paper proposes that seasonal differences must be taken into account as an impact factor over the frequency of adolescent male aggression in schools. Adapted from the source document.

Aggressive behavior is highly heritable, while environmental influences, particularly early in life, are also important. Epigenetic mechanisms, such as DNA methylation, regulate gene expression throughout development and adulthood, and may mediate genetic and environmental effects on complex traits. We performed an epigenome-wide association study (EWAS) to identify regions in the genome where DNA methylation level is associated with aggressive behavior. Subjects took part in longitudinal survey studies from the Netherlands Twin Register (NTR) and participated in the NTR biobank project between 2004 and 2011 (N = 2,029, mean age at blood sampling = 36.4 years, SD = 12.4, females = 69.2%). Aggressive behavior was rated with the ASEBA Adult Self-Report (ASR). DNA methylation was measured in whole blood by the Illumina HM450k array. The association between aggressive behavior and DNA methylation level at 411,169 autosomal sites was tested. Association analyses in the entire cohort showed top sites at cg01792876 (chr8; 116,684,801, nearest gene = TRPS1, p = 7.6 × 10−7, False discovery rate (FDR) = 0.18) and cg06092953 (chr18; 77,905,699, nearest gene = PARD6G-AS1, p = 9.0 ×10−7, FDR = 0.18). Next, we compared methylation levels in 20 pairs of monozygotic (MZ) twins highly discordant for aggression. Here the top sites were cg21557159 (chr 11; 107,795,699, nearest gene = RAB39, p = 5.7 × 10−6, FDR = 0.99), cg08648367 (chr 19; 51,925,472, nearest gene = SIGLEC10, p = 7.6 × 10−6, FDR = 0.99), and cg14212412 (chr 6; 105,918,992, nearest gene = PREP, p = 8.0 × 10−6, FDR = 0.99). The two top hits based on the entire cohort showed the same direction of effect in discordant MZ pairs (cg01792876, Pdiscordant twins = 0.09 and cg06092953, Pdiscordant twins = 0.24). The other way around, two of the three most significant sites in discordant MZ pairs showed the same direction of effect in the entire cohort (cg08648367, Pentire EWAS = 0.59 and cg14212412, Pentire EWAS = 3.1 × 10−3). Gene ontology analysis highlighted significant enrichment of various central nervous system categories among higher-ranking methylation sites. Higher-ranking methylation sites also showed enrichment for DNase I hypersensitive sites and promoter regions, showing that DNA methylation in peripheral tissues is likely to be associated with aggressive behavior.

This study focuses on how sports attitudes and participation relate to physical aggression outside sport for college athletes. Data were derived from a survey of nearly 200 male and female athletes at a medium-size (11,500-student) comprehensive university. Physical aggression was measured by an item concerning whether the respondents ever physically harmed or injured other persons outside sport in fights or disagreements. Although exploratory, this study suggests potentially valuable insights about how gender, beliefs in the value of toughness in sport, accidentally or intentionally hurting other athletes in competition, and participation in a team or contact sport relate to physical aggression outside sport. Whereas attitudes, having hurt other athletes, and team and contact sport participation all were related to physical aggression outside sport for male athletes, only participation in a contact sport was related to physical aggression outside sport for female athletes.