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Space-time mapping on the sagittal axis in congenital blindness

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Abstract

Previous evolutionary perspectives proposed that the space–time mapping on the sagittal axis originates from visuo-locomotion coupling when walking/running forward. Accordingly, the congenitally blind could not have developed a sagittal mental timeline if the latter depends on such a visuo-locomotion coupling. However, this conclusion was reached in only a single empirical study (Rinaldi et al. in J Exp Psychol General 147:444–450, 2018), and its theoretical underpinnings are not entirely convincing as locally static and continuous auditory input undergoes a relatively similar change as function of self-locomotion, but this type of sensory-locomotion coupling is spared even in congenital blindness. Therefore, the present study systematically explored whether the congenitally blind show space–time mappings on the sagittal axis using different paradigms in three experiments. In Experiment 1, using a typical implicit RT task, the congenitally blind showed the same preferred space–time mapping in the sagittal dimension as normally sighted participants did. In Experiment 2, this space–time mapping occurred even automatically when temporal relations were task-irrelevant in a naming task. In Experiment 3, in an explicit space–time mapping task, the congenitally blind were more likely to locate the past behind and the future in front of their bodies. Moreover, most blind participants used spatial metaphors for their space–time mapping on the sagittal axis. These results supported the conclusion that the congenitally blind have a sagittal mental timeline, and that their sensory-locomotion coupling experience was either more similar to that of sighted participants or not critical for the space–time mapping. The present study, thus, also helps to clarify the origin of the sagittal mental timeline.

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Data and materials are available from the corresponding author upon request.

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Acknowledgements

This study was supported by grants from the Fundamental Research Funds for the Central Universities (CCNU22QN020). We are grateful to Dr. Ulrich Ansorge for his meticulous review, insightful comments, and painstaking refinements throughout the review process. His contributions have significantly enhanced the quality of this work.

Funding

This study was supported by grants from the Fundamental Research Funds for the Central Universities (CCNU22QN020).

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Contributions

All authors contributed to the study conception and design. Material preparation and data collection were performed by QS and LC. Data analysis was performed by LS, YJ and ZH. The first draft of the manuscript was written by XD and FH. XD, ZF and XC were responsible for the critical revision of the manuscript for important content. All authors read and approved the final manuscript.

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Correspondence to Xianfeng Ding.

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Conflict of interests

The authors have no competing interests to declare that are relevant to the content of this article.

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Ethical approved was granted by the Institutional Review Board of Central China Normal University.

Informed consent

Informed consent was obtained from all individual participants in the study.

Open practices statement

Neither of the experiments reported in this article was formally preregistered. Neither the data nor the materials have been made available on a permanent third-party archive; requests for the data or materials can be sent via email to the lead author at xianfengding@ccnu.edu.cn.

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Hao, F., Shi, L., Sun, Q. et al. Space-time mapping on the sagittal axis in congenital blindness. Psychological Research 88, 338–347 (2024). https://doi.org/10.1007/s00426-023-01871-3

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  • DOI: https://doi.org/10.1007/s00426-023-01871-3

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