. Author manuscript; available in PMC: 2014 Sep 1.

Published in final edited form as: Pain. 2013 May 24;154(9):1758–1768. doi: 10.1016/j.pain.2013.05.030

Table 1.

Regressor structure used for first level analysis.

	Same	Space Different	Catch	Same	Intensity Different	Catch
Cue Maintenance	1	1	1	2	2	2
Acquisition	3	4	5	6	7	8
Memory	9	9	9	10	10	10
Discrimination	11	12	13	14	15	16
Pain	17	17	17	17	17	17

Numbers represent separate regressors used to identify brain activation associated with a given time period, stimulus condition, and cognitive task. Depending on the phase of experimental task (cue maintenance, memory, pain) one regressor may encompass multiple stimulus conditions.