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Independent effects of reward expectation and spatial orientation on the processing of emotional facial expressions

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Abstract

The present study investigated the effect of reward expectation and spatial orientation on the processing of emotional facial expressions, using a spatial cue–target paradigm. A colored cue was presented at the left or right side of the central fixation point, with its color indicating the monetary reward stakes of a given trial (incentive vs. non-incentive), followed by the presentation of an emotional facial target (angry vs. neutral) at a cued or un-cued location. Participants were asked to discriminate the emotional expression of the target, with the cue–target stimulus onset asynchrony being 200–300 ms in Experiment 1 and 950–1250 ms in Experiment 2a (without a fixation cue) and Experiment 2b (with a fixation cue), producing a spatial facilitation effect and an inhibition of return effect, respectively. The results of all the experiments revealed faster reaction times in the monetary incentive condition than in the non-incentive condition, demonstrating the effect of reward to facilitate task performance. An interaction between reward expectation and the emotion of the target was evident in all the three experiments, with larger reward effects for angry faces than for neutral faces. This interaction was not affected by spatial orientation. These findings demonstrate that incentive motivation improves task performance and increases sensitivity to angry faces, irrespective of spatial orienting and reorienting processes.

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Acknowledgments

This study was supported by Grants from the Natural Science Foundation of China (31000502, 31470979). Electronic mail concerning this study should be addressed to Dr. Ping Wei, aweiping@gmail.com or to Dr. Xiaolin Zhou, xz104@pku.edu.cn.

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Correspondence to Xiaolin Zhou or Ping Wei.

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Kang, G., Zhou, X. & Wei, P. Independent effects of reward expectation and spatial orientation on the processing of emotional facial expressions. Exp Brain Res 233, 2571–2580 (2015). https://doi.org/10.1007/s00221-015-4328-3

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  • DOI: https://doi.org/10.1007/s00221-015-4328-3

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