Facial, verbal, and symbolic stimuli differently affect the right hemisphere preponderance of stimulus-preceding negativity

Authors


  • This research was supported by a Grant-in-Aid for Scientific Research (C) 20530659 from the Japan Society for the Promotion of Science (JSPS). Some data included in this article were presented at the 51st Annual Meeting of the Society for Psychophysiological Research, Boston, MA, 2011. We are grateful to Shun Itagaki for his assistance in data collection. We also thank Dr. Taro Tomatsu for his assistance in data analysis.

Abstract

The present study investigated whether the right hemisphere preponderance of stimulus-preceding negativity (SPN) was affected by different categories of visual feedback stimulus. A time estimation task was performed with facial, verbal, symbolic, and no-feedback conditions. A principal component analysis identified an early component of SPN in addition to a late component that was morphologically similar to the original SPN. Motivational scores in the verbal and facial conditions were higher than that in the symbolic condition. Significant right hemisphere preponderance of the late SPN was observed in the symbolic condition but not in the verbal condition, whereas right hemisphere preponderance of the early SPN was observed in the facial condition. The right hemisphere preponderance was influenced by the category of visual feedback stimulus through stimulus-related activation and the effect of the motivational level.

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