Dr Brinkman, a brain researcher at the Australian National University in Canberra, has suggested that evolution of speech went with right-handed preference.
The order of preference of inhalant anesthetics for euthanasia is halothane, enflurane, isoflurane, sevoflurane, methoxyflurane, and desflurane, with or without nitrous oxide.
Results Compared with control group,the changes of neuronic ultrastructure in hippocampus CA1 in high preference group and low preference group were more severes.
According to Brinkman, as the brain evolved, one side became specialised for fine control of movement (necessary for producing speech) and along with this evolution came righthand preference.
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