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Genetic contribution to individual variation in binocular rivalry rate
Steven M Miller1, Narelle K Hansell, Trung T Ngo
1Perceptual and Clinical Neuroscience Group and Monash Alfred Psychiatry Research Centre, School of Psychology & Psychiatry, Monash University, Melbourne, Victoria 3145, Australia. steven.miller@med.monash.edu.au
Individual differences in binocular rivalry rate, a phenomenon where perception alternates between conflicting images, are substantially influenced by genetics. This study found a significant genetic contribution to these variations, suggesting further genetic research is warranted.
Area of Science:
- Neuroscience
- Behavioral Genetics
- Psychiatry
Background:
- Binocular rivalry involves alternating perception of conflicting visual stimuli presented to each eye.
- Individual rates of binocular rivalry vary significantly, with unknown underlying causes.
- Slow binocular rivalry is observed in bipolar disorder, a condition with high heritability.
Purpose of the Study:
- To investigate the genetic contribution to individual differences in binocular rivalry rate.
- To explore the potential of binocular rivalry rate as an endophenotype for bipolar disorder.
Main Methods:
- Utilized the twin method, comparing monozygotic (MZ) and dizygotic (DZ) twins.
- Analyzed binocular rivalry rates in 128 MZ twin pairs and 220 DZ twin pairs.
- Applied genetic modeling to estimate variance components.
Main Results:
- MZ twin correlation for binocular rivalry rate was 0.51; DZ twin correlation was 0.19.
- Additive genetic factors accounted for 52% of the variance in binocular rivalry rate.
- Nonshared environmental influences explained 18% of the variance; the rest was measurement error.
Conclusions:
- Demonstrated a substantial genetic influence on individual variation in binocular rivalry rate.
- Supports further genetic and molecular research into binocular rivalry.
- Suggests slow binocular rivalry may serve as an endophenotype for bipolar disorder.
