I'd like to go a bit more in depth about this.
Deixis
Traditionally, by deixis is meant the location and identification of person, objects, events, processes and activities being talked about, or referred to, in relation to the spatiotemporal context created and sustained by the act of utterance and the participation in it, typically, of a single speaker and at least one addressee; we can analyze them this way:
- Person deixis: those that are used to refer to speaker and addressee (I, you, we);
- Place deixis: those that refer to spatial context (here, there);
- Time deixis: these that refer to temporal context (now, then, verb tense markers);
- Discourse deixis: those that refer to parts of unfolding discourse (next, below, furthermore);
- Social deixis: those that encode aspects of the social relationship between speaker and addressee (Her Majesty);
- Perceptual deixis: There's Harry.
Deixis concerns the use of certain linguistic expressions to locate entities in spatiotemporal, social and discursive context. First and second person pronouns, demonstratives, tense, certain place and time adverbials, verbs such as come, go, bring, take and fetch. Such deictic expressions encode specific aspects of the speech event and cannot be interpreted unless contextual parameters are taken into account.
Without physical context we cannot interpret utterances like:
I'll meet you over there.
See you tomorrow.
Will be back in 10 minutes.
You, you and you, come over here.
He does not like that.
Put that here and then move this over there.
Deictic expressions refer to a deictic field of language whose zero point is fixed by the person who is speaking, the place of utterance and the time of utterance (I, here, now, respectively, etc). Deictic constructions construct the speaker as the deictic center.
Anaphora and Cataphora
Anaphora, along with cataphora and other devices, belong to the so-called Patterns of reduction. In other words they allow you to say less, but still keep sense in your utterances.
- Anaphora = reference backward
- Cataphora = reference forward
Anaphora is a lower expenditure of cognitive effort for recovering the conceptual content of the co-referring expression (more efficient) - the identity of the content is made plain in advance. Cataphora's processing requires the creation of a temporarily empty slot until the required content is supplied (low efficiency): it is often used to generate uncertainty and to intensify receiver's interest (effectiveness).
The difference
The Anaphora, in the linguistics sense, makes use of deictic expressions:
Sam went home because he was tired.
"He" is the anaphora expression referring to "Sam", but it's also a deictic expression, i.e. it changes according to the context/subject.
Deixis, on the other hand, is not necessarily related to anaphora. For example, there's no anaphora in this sentence:
You, you and you, come over here.
Those are just deictic expressions referring to 3 different subjects, but no anaphora.