Key points are not available for this paper at this time.
Current research dealing with the effects of various schedules on free-operant behavior in lower organisms is aided greatly by a large literature of techniques and data. Unfortunately, only a limited literature of this sort is available to aid in- vertigators of operant behavior in children. The purpose of this paper is to present some techniques and data which may be of use to others working in this area.
Long et al. (1958) studied this question.