. Author manuscript; available in PMC: 2018 Aug 1.

Published in final edited form as: Behav Processes. 2017 Apr 19;141(Pt 1):42–49. doi: 10.1016/j.beproc.2017.04.008

Table 2.

Key abbreviations and DBERM parameters

Schedules
MAINT	Maintenance. Reinforcement was scheduled according to a tandem variable-time (VT) fixed ratio (FR) schedule.
EXT	Extinction disrupter. Lever presses had no programmed consequences.
NCR	Non-contingent reinforcement disrupter. Reinforcement was scheduled according to a variable-time (VT) schedule.
PRE	Pre-feeding disrupter. Same as MAINT, but access to chow was provided prior to session.
DBERM Parameters
L_t	Mean length of a response bout at time t.
w_t	Within-bout response rate at time t.
b_t	Bout-initiation rate at time t.
HL(X)	Half-life of parameter X. The time it would take for X to decline to half of its estimated value at t = 0.