Final answer:
The subject of this question is Psychology, and it pertains to callers with restricted emotional expression. This can be related to individuals with posttraumatic stress disorder (PTSD), and cultural display rules and body language also influence emotional expression.
Step-by-step explanation:
The subject of this question is Psychology. The question is asking about callers who have extremely restricted emotional expression and experience.
In psychology, this can be related to individuals suffering from posttraumatic stress disorder (PTSD). Studies have shown that people with PTSD often have reduced emotional expression.
It is important to note that the ability to produce and recognize facial expressions of emotions is universal, but cultural display rules and body language also play a role in how emotions are expressed.