However, it has resolved many of the methodological issues associated with the facial feedback hypothesis.

Two versions of the facial feedback hypothesis appeared, although "these distinctions have not always been consistent".

The facial feedback hypothesis states that facial movement can influence emotional experience.

Floyd Allport came up with the facial feedback hypothesis.

There is also the facial feedback hypothesis: that changes in facial expression can lead to corresponding changes in emotion.

Originally, the facial feedback hypothesis studied the enhancing or suppressing effect of facial efference on emotion in the context of spontaneous, "real" emotions, using stimuli.

The facial feedback hypothesis, "that skeletal muscle feedback from facial expressions plays a causal role in regulating emotional experience and behaviour" developed almost a century after Darwin.

He also proposed the facial feedback hypothesis according to which emotions which have different functions also cause facial expression which in turn provide us with cues about what emotion exactly a person is feeling.

According to Browndyke, "the strongest evidence for the facial feedback hypothesis to date comes from research by Lanzetta et al. (1976)" (but see "Studies using Botox" below for more recent and powerful evidence).

Despite facial feedback hypothesis (facial display is necessary in the experience of emotion or a major determinant of feelings); in the case of surprise, research has shown a strong dissociation between the facial display of surprise and the actual emotional experience of surprise.