Suspense is an intensely stimulating experience in the brain that significantly improves engagement and attachment to the subject.
It’s a complex interplay of emotional arousal, cognitive anticipation, and reward mechanisms.
Emotionally it involves a mix of fear, anxiety, hope, and excitement (mostly in the amygdala region of the brain).
Cognitively the brain is absorbed trying to predict what comes next (involving the pre-frontal cortex).
And the tension, created by the suspense, feels satisfying to resolve (releasing dopamine).