Jing Chen

Jing Chen

Jing Chen received her Bachelor degree of Engineering from Xi'an Jiaotong University and her master degree of Science from Peking University. She is now working in Li's lab for her PhD. Some of her current research interests focus on how different cortical brain damages affect active control of self-motion.

APVC 2013 - When subliminal stimuli fail to transfer across hemispheres: interhemispheric integration of nonconscious information

Jing Chen, Janet Hui - wen Hsiao Department of Psychology, The University of Hong Kong

In a go/no go task using left pointing ( <) and right pointing (> ) arrows, the target arrow in the center was preceded by a masked subliminal arrow prime with a short duration (10, 20, 30, 40 ms) in the left visual field (LVF) or right visual field (RVF). Half of the participants were asked to respond to the left pointing target, and the other half to the right pointing target. Each participant used the left and right hand alternatively from block to block to respond. While unaware of the existence of the priming arrow, participants showed slower “go” responses to targets with a congruent prime than to those with an incongruent prime in the 20, 30, and 40ms prime conditions; this effect may be due to response inhibition triggered by invisible primes as revealed by Eimer and Schlaghecken (2002).

More interestingly, when participants responded with their left hand (i.e., the non dominant hand; all participants were right handed), the priming effect was found only when the prime was presented in the LVF/right hemisphere (RH) but not the RVF/left hemisphere (LH); in contrast, the priming effect was observed in both the LVF and RVF when participants responded with their right hand. This difference in responding hand may be due to difference in the efficiency of interhemispheric transfers between the two hemispheres. Subliminal prime information in the RVF/LH may be insufficient to be transferred to the RH to affect subsequent judgments when probed by the non dominate left hand/RH. This finding is consistent with the literature reporting that transmission of visuomotor information from the LH to the RH is slower than that from the RH to the LH (see Brown, Larson, and Jeeves, 1994, for a metaanalysis); it also suggests that hemispheric asymmetry effects without contamination from interhemispheric communication can be better observed at subliminal level.

Grant support:The Research Grant Council of Hong Kong (project code HKU 745210H to J.H. Hsiao) and the HKU Seed Funding Program for Basic Research (project code 201011159124 to J.H. Hsiao).

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