First records of
sinistrality in the hogchoker, Trinectes maculatus (Bloch and Schneider) and partial albinism within a reversed American Heterostomate.
And a DNA-based family tree of the snail genus showed that sinistrality has arisen independently at least six times in Satsuma, more than would be expected were there not some driving force behind its evolution.
But Masaki has shown the snake might actually speed up the fixation of sinistrality, suggesting this is a very plausible speciation mechanism," he added.
Is forced dextrality an explanation for the fall in the prevalence of
sinistrality with age?
This suggests that maternal, rather than paternal
sinistrality, is associated with the elevated incidence of left-handed sons issuing from LL couples, the generally higher incidence of left-handed sons to LL couples possibly, therefore, being due to maternal
sinistrality plus a minor base rate increment attributable to either dextral or sinistral fathers.
In Annett's hand preference classification procedure, the basic decision as to the
sinistrality or dextrality of the individual is made on the basis of the hand preferred for writing.
The influences of handedness, sex, familial
sinistrality, and androgyny on language laterality, verbal ability and spatial ability.
Many small-scale studies have investigated the relationship between handedness and intelligence (and/or talent), along with sex and familial
sinistrality as moderating variables; in reviewing the topic O'Boyle & Benbow (1990) concluded that 'the variability of |the~ findings speaks to the likelihood of a Type 1 error'.
We must therefore conclude that there is no convincing evidence, despite a wealth of intriguing folkloric and etymological evidence, that modern-day Kerrs and Carrs have an increased likelihood of
sinistrality.
