Heritablity value 0.4 is on average about 40% of the individual difference that we observe in , say shyness may in some way be attribute to genetic individual difference.
The value of hetitability always lies between 0 and F. Humans narrow sense of heritability is approximately 0.8. Heritability value measure the differences in people's genes account for differences in their trait. Traits can includes characteristics such as height, eye, color and intelligence as well as disorders like schizophrenia and autism spectrum disorder.
It is measure that important genetics is to a trait. High heritabilty is near to 1 that is indicate that genetics explain lot of variation in trait and low heritability near zero which indicates the most of the variation is not genetic.
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