A role for attention during wilderness navigation: Comparing effects of BDNF, KIBRA, and CHRNA4.

OBJECTIVE To better understand what influences interindividual differences in ability to navigate in the wilderness, we hypothesized that better performance would be seen in (a) BDNF (rs6265) Val/Val homozygotes increased use of a spatial strategy, (b) KIBRA rs17070145 T/T homozygotes superior episodic memory, (c) CHRNA4 (rs1044396) T allele carriers better ability to focus visuospatial attention. METHOD Military cadets (n = 382) genotyped for BDNF, KIBRA, and CHRNA4 SNPs used a map and compass to navigate in unmarked woods. Participants completed a morning course within 3.0 km and an afternoon course within 7.0 km. RESULTS Success or failure in finding each point was analyzed in a logistic regression model with KIBRA, BDNF, and CHRNA4 genotypes as fixed effects. For the morning course, the adjusted odds ratio for the effect of KIBRA T/T over KIBRA C/C was 2.58 (95% CI of 1.31, 5.06) demonstrating a statistical benefit of the KIBRA T/T genotype over individuals with KIBRA C/C genotype. BDNF did not have an independent association with navigational success. For the afternoon course, the adjusted odds ratio for the effect of CHRNA4 C/T over C/C was 1.67 (95% CI of 1.24, 2.25) demonstrating a statistical benefit of CHRNA4 T allele carriers over the C/C genotype. CONCLUSIONS Ability to navigate in the wilderness benefits less from sense of direction (BDNF and Santa Barbara Sense of Direction) and more from episodic memory (KIBRA) in the first course and heightened ability to focus attention (CHRNA4) after experience in the 2nd course. (PsycINFO Database Record

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