In a paper attempting to outline the conceptual domain of comparative psychology , Herbert Spencer discusses the quality of impulsiveness in relation with human races (bearded and unbearded). Among his "sundry questions of interests" about the relationship between mental energy, evolution, complexity, etc. are the following notes: ( b ) What connection is there between this trait and the social state? Clearly a very explosive nature - such as that of the Bushman - is unfit for social; and, commonly, social union, when by any means established, checks impulsiveness. ( c ) What respective shares in checking impulsiveness are taken by the feelings which the social state fosters - such as the fear of surrounding individuals, the instinct of sociality , the desire to accumulate property, the sympathetic feelings , the sentiment of justice? These, which require a social environment for their development, all of them involve imaginations of consequences more or less distant; and th...
"Two extraordinary facts concerning the small bullets with holes (now dubbed type IIIs) also emerged. First, they could be successfully slung in small groups of three or four to create a form of grapeshot. This had been independently confirmed by T Richardson in his work on Roman sling-bullets at the Royal Armouries. Even more intriguingly, the mysterious holes proved to confer an aerophonic quality: in flight, these lead shot whistled, or more accurately gave off a mechanical buzzing sound eerily reminiscent of an agitated wasp (click below to hear for yourself). Remarkable as it sounds, the simplest explanation for this design modification is that it represents an early form of psychological warfare. To put it another way, the Roman attackers valued the terror that hearing the incoming bullets would instil in the defenders." - http://www.archaeology.co.uk/articles/features/burnswark.htm
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