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An accelerometer is a device that measures force due to gravity or a change in speed or direction of travel. This paper describes accelerometers and their application in other disciplines and, by way of an example, explores the utility of accelerometers for studying aggression. We end with a discussion of additional ways accelerometers might be used in group processes research.

We first review the use of accelerometers in other disciplines. We then present the results of four studies that demonstrate the use of accelerometers to measure aggression. Study 1 establishes the measure’s concurrent validity. Study 2 concerns its stability and representative reliability. Study 3 seeks to establish the measure’s predictive validity by associating it with an existing measure. Study 4 demonstrates the ability of accelerometers to address a sociological research question.

In Studies 1 and 2, we find that accelerometers can be used to differentiate between distinct levels of aggression. In Study 3, we find that men’s average peak acceleration correlates with a previously validated measure of aggression. Study 4 uses accelerometers to reproduce a well-established finding in the aggression literature.

We conclude that accelerometers are a flexible tool for group processes’ researchers and social scientists more broadly. Our findings should prove useful to social scientists interested in measuring aggression or in employing accelerometers in their work.

In setting up training recommendations and introducing new concepts to craft training, the Construction Industry Training Board and its staff fortunately broke with tradition and, armed with a timely survey report of construction occupations by the Building Research Station, courageously by‐passed a maze of committees and organisations to develop a new plan of training for construction operatives. When the plan was presented for adoption in June of 1968 it was received with some dismay and hostility by some Board and Building Committee members but was allowed to proceed on a pilot basis. Original plans were scaled down and the mechanical engineering services course was deferred for a year, but a break‐through had been made and a chance for meaningful change and progress was at hand. The year 1968/69 was to be a crucial one for the future of building craft training.

In recent weeks the building industry has once again been sending out agonised cries for help to solve its problem of shortage of skilled labour. This agony comes about two years after the industry emasculated the Construction Industry Training Board, especially the section concerned with operative training. Now, according to a recent article in The Guardian, desperate employers in the middle of a boom have asked the CITB to appoint a specialist to study the training and supply of new craftsmen. ‘David Algate, aged 39, a former surveyor and Tory city councillor in Plymouth started his new job this week.’ Ironically Mr Algate is a survivor of a CITB team of ‘specialists’ who developed and attempted to institute new patterns of training craft apprentices in 1968/69 and his qualifications and experience are somewhat more substantial than having once been a Tory city councillor.

Aarhus Kommunes Biblioteker (Teknisk Bibliotek), Ingerslevs Plads 7, Aarhus, Denmark. Representative: V. NEDERGAARD PEDERSEN (Librarian).

The Presidential Address to the Liverpool Engineering Society by Mr. Farthing (the salient points of which are reproduced in this issue) has particular bearing upon lubrication and especially on young lubrication engineers. Mr. Farthing stressed the very wide field open to young engineers and the difficulties associated with training in order to cover as wide a field as may be necessary. It is usually so important to gain a wide knowledge before one can specialise and this is certainly the case with lubrication engineers. One cannot begin to fully appreciate the intricacies of a lubrication system with all its accessory components lubricating and guarding, for example, a large motive power plant or rolling mill, until one has more than a mere working knowledge of the plant itself, the duties it must perform, how it performs them and the snags that arise which might be overcome by correct lubrication. In view of the fact that lubrication systems are just as important in a textile mill as in a power station or a large brick works, the almost impossible‐to‐achieve‐range of knowledge that would simplify the work of a lubrication engineer is very obvious. Fortunately, lubricating principles apply to most cases and knowing how to apply one's knowledge from basic principles is the key to success in this difficult profession.

AN all‐magnesium aircraft has been built in the United States by East Coast Aeronautics Inc. under contract to the Air Force Air Development Center. It is the latest in a series of projects connected with the use of magnesium for aircraft primary structures. J. P. Donald Garges, vice‐president of the company, gave a detailed account of these projects in a paper presented to the Institute of Aeronautical Sciences at its annual meeting in January 1955, and published in Aeronautical Engineering Review in August 1955.

The risk of aggression is higher among people with psychiatric disorders. This study aims to determine the association of aggression with schizophrenia, bipolar disorder (BD) and major depressive disorder (MDD) in patients referred to Shahid Beheshti Teaching Hospital in Kerman.

This was a cross-sectional study of 518 patients diagnosed with schizophrenia, BD and MDD who met the inclusion criteria and were compared with a comparison group. All participants completed the Buss–Perry Aggression Questionnaire (BPAQ). Independent samples t-test and Pearson correlation coefficient were used to investigate the relationship between the score of BPAQ and other variables. The Beck Depression Inventory (BDI-13), Young Mania Rating Scale (YMRS) and Positive and Negative Symptom Scale (PANSS) were completed by MDD, BD and schizophrenia patients, respectively.

The mean score of total aggression and its components in the comparison group was significantly (P-value = 0.001) lower than that of the other groups. However, no significant difference was observed between the three schizophrenia, MDD and BD groups. The total aggression score of BPAQ had a significant positive correlation with BDI-13 and YMRS and a significant negative correlation with the PANSS score. Single patients with schizophrenia and people in the comparison group with lower education levels had a higher total aggression score.

Suffering from BD, MDD and schizophrenia, especially in single patients with a lower education level, is associated with physical and verbal aggression, anger and hostility, which emphasizes the need for periodic examination and screening of aggressive behaviors in these patients.

Various mass shooters have explained their violent actions as a response to failing at dominant forms of masculinity, including rejection from women and negative social comparisons to other men. The affect control theory of self (ACT-Self) posits that interactions that violate one's sense of self cause inauthenticity. This disequilibrium motivates behaviors that restore self-meanings, which may partially explain the link between challenges to the self and compensatory violence.

In Study 1, we use ACT-Self to examine the relationship between inauthenticity, violent fantasies, and physical aggression in the autobiography of one mass shooter. We quantify self-sentiments and inauthenticity using ACT-Self measures and methods, and perform a thematic analysis of the shooter's interpretations of and responses to disconfirming events. In Study 2, we examine the relationship between these same concepts in a survey of 18-to-32-year-old men (N = 847).

Study 1 shows that the shooter's inability to achieve popularity, wealth, sex, and relationships with beautiful women (compared to other men) produced inauthenticity that he resolved through violent fantasies, increasingly aggressive behavior, and ultimately, mass violence. Study 2 finds that inauthenticity arising from reflected appraisals from women predicts self-reported violent fantasies and physical aggression in a convenience sample of men in emerging adulthood.

This work leverages a formal social psychological theory to examine the link between self-processes and violence. Our findings suggest that men's inauthenticity, particularly produced by reflected appraisals from women, is positively associated with violent fantasies and acts. Further work is needed to assess whether this relationship is causal and for whom.

This is a shortened version of the Discussion that took place at Birmingham in January. Part One, which covered Lubricants for the Cold Rolling of Non‐Ferrous Metals and Alloys appeared in our February issue.

Extensive human and animal research has examined approach and withdrawal motivation, which we define as the simple urge to move toward or away, respectively. In this chapter, we review seminal and recent research that showing that asymmetrical frontal cortical activity underlies approach and withdrawal motivation that occur during childhood, that characterize certain psychopathologies, and are present in everyday emotional experiences. Specifically, greater left-frontal activity is involved in approach motivation, including the expression and experience of anger, jealousy, desire, and joy. Conversely, greater right-frontal activity is involved in withdrawal motivation, including the expression and experience of some forms of sadness, crying, and depressed mood. We also review recent research suggesting that connectivity between the frontal and parietal cortices is a potential mechanism for the motivation-related effects of asymmetrical frontal activity.