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2D:4D and spatial abilities: From rats to humans.

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|April 25, 2018
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Summary

Digit ratio (2D:4D) reflects prenatal hormone exposure and predicts spatial ability. This study confirmed the 2D:4D and spatial performance link in rats and humans, exploring associated brain correlates.

Keywords:
2D:4DHumanMemoryPrenatal programmingRatSpatial abilities

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Area of Science:

  • Neuroscience
  • Comparative Psychology
  • Human Physiology

Background:

  • Spatial abilities are linked to prenatal hormone exposure, specifically testosterone and estrogen.
  • The 2nd to 4th digit length ratio (2D:4D) serves as a proxy for in utero hormone levels.
  • Previous research suggests a correlation between 2D:4D and spatial skills.

Purpose of the Study:

  • To investigate the relationship between 2D:4D and spatial performance in both rodent and human models.
  • To identify the anatomical and functional brain correlates underlying the 2D:4D and spatial ability association in humans.

Main Methods:

  • Utilized two spatial tasks in rats: a paired-associate task and a watermaze.
  • Replicated the 2D:4D and spatial performance assessment in human participants.
  • Employed neuroimaging techniques to examine brain structures and functions related to spatial performance and 2D:4D.

Main Results:

  • Confirmed a significant association between 2D:4D and spatial task performance in rats.
  • Replicated the 2D:4D and spatial performance correlation in the human cohort.
  • Identified specific anatomical and functional brain differences associated with 2D:4D and spatial abilities in humans.

Conclusions:

  • The 2D:4D ratio is a reliable indicator of prenatal hormone exposure influencing spatial abilities across species.
  • This study provides novel insights into the neural underpinnings of how early hormonal environments shape cognitive functions like spatial navigation.