Full Idea
The problem for internalists of Doxastic Decision Interval says internal justification must avoid mental change to preserve the justification status, but must also allow enough time to compute the formal relations between beliefs.
Clarification
'Doxastic' means concerned with beliefs
Gist of Idea
Internal justification needs both mental stability and time to compute coherence
Source
Alvin I. Goldman (Internalism Exposed [1999], §4)
Book Reference
Goldman,Alvin I.: 'Pathways to Knowledge' [OUP 2002], p.13
A Reaction
The word 'compute' implies a rather odd model of assessing coherence, which seems instantaneous for most of us where everyday beliefs are concerned. In real mental life this does not strike me as a problem.