 At first blush, the things we ordinarily call emotions differ from one another along several dimensions. For example, some emotions are occurrences (e.g., panic), and others are dispositions (e.g., hostility); some are short-lived (e.g., anger) and others are long-lived (e.g., grief); some involve primitive cognitive processing (e.g., fear of a suddenly looming object), and others involve sophisticated cognitive processing (e.g., fear of losing a chess match); some are conscious (e.g., disgust about an insect in the mouth) and others are unconscious (e.g., unconscious fear of failing in life); some have prototypical facial expressions (e.g., surprise) and others lack them (e.g., regret). Some involve strong motivations to act (e.g., rage) and others do not (e.g., sadness). Some are present across species (e.g., fear) and others are exclusively human (e.g., schadenfreude). And so on.