The intense world theory sounds similar to Eysenck’s theory of introversion vs extraversion from the 1960s. One summary:
Eysenck (2008/1967) believed that differences in extraversion were due to physiological differences in brain systems that caused some people to be more easily aroused than others. Specifically, he proposed that the ascending reticular activating system (ARAS) regulated arousal. People differ in the sensitivity of this system, which causes them to respond differently to their environment. A moderately stimulating environment might cause people with a very sensitive ARAS to feel overstimulated and retreat (i.e., to behave like introverts), but people with a less sensitive ARAS to feel understimulated and seek out additional stimulation (i.e., to behave like extraverts).
The inverted U arousal graph is typically plotted as Performance vs. Arousal and called the Yerkes–Dodson law.
Another summary here; more findable with keywords like “optimal level of arousal”, Eysenck, and extraversion.
The intense world theory sounds similar to Eysenck’s theory of introversion vs extraversion from the 1960s. One summary:
The inverted U arousal graph is typically plotted as Performance vs. Arousal and called the Yerkes–Dodson law.
Another summary here; more findable with keywords like “optimal level of arousal”, Eysenck, and extraversion.