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. Author manuscript; available in PMC: 2011 Aug 1.
Published in final edited form as: Behav Neurosci. 2010 Aug;124(4):510–519. doi: 10.1037/a0020083

Table 3.

Experimental Design

Conditioning Test
CS Type Drug Trials
Light X Saline X 2 Light?
Compound Naltrexone
SKF 38393		 8

Note. Animals were conditioned to fear a light CS or compound light-noise CS. Two-trial or eight-trial conditioning proceeded under the influence of the opioid antagonist naltrexone, the saline vehicle or the partial dopamine (D1) agonist SKF 38393. The CS type, drug condition and number of trials were manipulated using a 2 × 3 × 2 factorial design. The following day, animals were tested to one presentation of the light CS.