Final answer:
Research following Paul Ekman's universality studies identified contempt as another universally recognized facial expression, adding to the list of universal emotions such as happiness and anger, and suggesting an innate basis for these expressions.
Step-by-step explanation:
Subsequent to the original universality studies by Paul Ekman, research demonstrated that contempt was another facial expression recognized universally alongside happiness, surprise, sadness, fear, disgust, and anger. Notably, even individuals who are congenitally blind exhibit these universal expressions, suggesting an innate basis for these facial expressions that are not learned through visual cues.
Cultural display rules may affect when and how emotions are expressed, but the facial expressions of emotions tend to be consistent across different cultures, reinforcing the idea of universal emotional expressions outlined by Charles Darwin and evidenced through extensive research by Ekman and others.