INDEXICALITY

The mental image / representation of a person or of a group of people according to a linguistics variable.

So, indexicality is a mental persepcion about someone depending on the language or the way in which the person speaks taking into account region or nationalitation. For instance: German people are seen as angry people, Argentines are seen as presumed people, Paisas are seen as productive and creative people, or Costeños are seen as lazy people.

 

Accommodation is the proces in which speakers adapt their linguistic behavior in light of their interlocutors behaviour and their attitudes towards their interlocutor ( may be a conscious or uncounscious process).