Test Revisions to the ekman model and other proposals

QUESTION 1: What argument does the University of Glasgow research use to propose a reduction to four basic emotions?

Whether they are discrete and universal categories or whether they exist on a dimensional spectrum influenced by culture
If the emotions are six or seven, without further nuances
Whether Daniel Goleman or Paul Ekman are definitively right
If facial expressions really exist

It completely invalidates it
Replaces it with the Glasgow four-emotions model
It enriches and nuances it, without nullifying its importance as a fundamental reference
Show that only Goleman's social emotions are relevant