3. The method of claim 1 , further comprising assigning a confidence weight to each indicator n-gram.
4. The method of claim 3 , wherein: assigning a confidence weight to each indicator n-gram comprises assigning to each indicator n-gram a confidence weight equal to p divided by a total number of appearances in the training corpus of instances of the particular n-gram represented by that particular indicator n-gram; where instances of the particular n-gram represented by that particular indicator n-gram appear p times in the training corpus in association with the single cognitive motivation orientation with which instances of the particular n-gram represented by that particular indicator n-gram are most frequently associated in the training corpus.