Halliday & Matthiessen (2014: 275, 275n):
But these four criteria do not always coincide, and not every instance can be clearly assigned to one category or the other. ¹ …
¹ Thus we find clauses where the participial form of the mental process verb is submodified but where the Phenomenon is also present in the form it takes in a ‘receptive’ clause; for example: she was very intrigued by alternative ideas; I was very depressed by some feedback I was getting.