Final answer:
A 'deadpan expression' refers to an emotionless face, similar to a mask. This can refer to literal masks in art or to the universal capability of expressing distinct emotions, where a deadpan face contrasts with the seven universal emotions with distinct facial expressions studied by Paul Ekman.
Step-by-step explanation:
This type of "face" is typically described as having a deadpan expression, which is an emotionless and mask-like facial appearance. This term can be applied to a variety of contexts, from actual masks used in art or theater, to the facial expressions of individuals in certain psychological states.
For example, in art, the Kritios Boy sculpture displays the Severe style with an emotionless face contradicting the naturalism of the body, leading to a psychological separation between the art and the viewer. In psychology, different facial expressions are associated with distinct emotions, a study corroborated by Paul Ekman's research, which suggests that patterns of facial muscle activity are universal across cultures and even in those who cannot see.
Thus, a deadpan expression stands in stark contrast to the seven universal emotions identified by Ekman, which includes happiness, surprise, sadness, fright, disgust, contempt, and anger, all of which have distinct facial expressions.