There’s a section in the book The g Factor by Arthur Jensen, where positive and negative correlates of g (general intelligence) are listed. Among the positive correlates are variables like education, height, income, social skills, supermarket shopping ability, talking speed, emotional sensitivity and sports participation in university. Among the negative correlates listed were smoking, alcoholism, crime, impulsivity, dogmatism, racial prejudice, weight/height ratio, and hysteria. When I saw that hysteria was negatively correlated with IQ, I was reminded of a movie they used to repeat on TV every couple years when I was young, and that I have been trying my whole life to hunt down. Finally I found a clip of it on Youtube; it’s called Special People.
The film is about mental retardation, and as a kid I found it mesmerizing. I estimate the characters (who seem to be largely played by themselves) have what is sometimes known as “Educable (mild) Retardation” (IQ 50ish to 70) which is one level up from “Trainable (moderate) Retardation” (IQ 40ish to 50ish). The educable are more likely to have what Jensen called familial retardation (biologically normal low IQ) while the trainable are more likely to have organic retardation (biologically abnormal low IQ), though both types of retardation are found at both levels; the main difference is that familial retardates look normal and tend to come from low IQ families while organic retardates look unusual and can come from any family.
Back to hysteria. At around 10 minutes into the below video, one of the disabled characters goes absolutely ballistic. In sharp contrast, the highest IQ people I have ever known have been generally very calm and composed, even under pressure: