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. 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

Figure 2.

Figure 2

Behavioral responses during spatial and intensity discriminations (mean ± SEM). Difference 1 corresponds to the smaller difference either in location (4 cm) or intensity (1°C). Difference 2 corresponds to the larger difference in location (16 cm) or intensity (2°C). Both error rates (*, p = 0.0038) and response latencies (*, p< 0.0001) were significantly lower for spatial compared to intensity discriminations. As location or temperature differences between T1 and T2 stimuli decreased, response latencies and error rates became significantly larger, indicating that discrimination of noxious heat stimuli became more difficult. Although performance on catch trials varied between spatial and intensity tasks, the magnitude of the increase in the error rates between “catch” and “same” trials was almost identical between the two.