How to get subjects
From Price et al. 1991 “The use of prosody in syntactic disambiguation”:
Subjects were rewarded with pizza and soft drinks after the session. The subjects were all native speakers of American English, naive with respect to the purpose of the experiments. Most were engineering students, recruited through flyers advertising the free pizza. For the second two speakers, F3A and M1B, to attract more subjects, we increased the incentive by offering an addition $50 prize to the person who scored highest on the task.