Final answer:
Emilio likely used the term 'perceptual region' to describe a vernacular region, which are defined by individual perceptions and often have fluid boundaries.
Step-by-step explanation:
When discussing a vernacular region during a presentation and using a different term, Emilio most likely referred to it as a perceptual region. Vernacular or perceptual regions are based on people's perceptions and thoughts and often have loosely defined boundaries that can differ widely among individuals. These regions are characterized by the subjective feelings and attitudes of people towards a place, rather than by objective, measurable criteria.
For instance, places like 'The Middle East', 'The South', 'The Midwest', 'Dixie', 'So Cal', and 'New England' are vernacular regions in the United States. The extent of these regions can vary depending on whom you ask, because they don't necessarily have a set of defining criteria that are universally agreed upon. However, they are an important aspect of geographic and cultural identity.
Other types of regions, such as functional regions or nodal regions, are defined by their function or a central location that connects other places in a network. These are contrasted with formal regions, also known as homogeneous regions, which are defined by one or more measurable, distinct characteristics