In this definition of the EH, Kuno suggests that making an entity relevant in previous
discourse increases its right to be empathized with. However, Kuno does not elaborate on
whether “topic of the present discourse” refers to explicit mentioning of a topic or making it
relevant by some other means. A strict interpretation of “topic of present discourse” could
refer only to entities that have been explicitly mentioned previously, as in (2.8a) and (2.8b).
In these examples, the speaker mentions
John
in the first sentence (i.e., context sentence),
which explicitly makes
John
a relevant discourse topic.
In addition to an explicitly referenced topic, it is possible for a topic to be made
relevant through other entities in the sentence, as in
I took the bus to Long Beach.
Unfortunately, the driver didn’t have change
. This example derives from Prince (1981, pp.
233 ff.), in which she proposes
assumed familiarity
of knowledge and connotations between
interlocutors. In this example, the phrase
took the bus
suggests that other entities and
actions were involved in this event. Clark (1975) describes this phenomenon as
bridging
, in
which the relevant but implicit information derives from a series of implicatures. For
example, a bus, a bus driver, paying fare, and other passengers are primed as candidates
for being involved in this event. Similarly, in Fillmore’s (1976) notion of frame semantics,
bus/driver/money are all interrelated and derive meaning from one another in the same
semantic frame. This knowledge is culturally shared by the interlocutors, hence they are
reasonable impositions. Thus, without explicitly mentioning these other entities, the first
sentence makes other entities, such as
the driver
, valid as the topic of the second sentence.
Along with topicalization through previous explicit reference and through semantic
priming, an entity can be “coreferential with the topic of present discourse” if it is of mutual
current concern between the speaker and the hearer. Yokoyama (1986) argues that the set
of notions {
you, me, here, now
} is the minimum set of items that is required to be mutually
acknowledged between interlocutors. As a result, the entities
you
(hearer) and
I/me