BRAIN MANIPULATION. “Locomotion in invertebrates also involves the action of…dopamine, serotonin and octopamine. In several cases of behavioural manipulation, neurotransmitter levels were found to be altered…higher levels of brain serotonin seem to be functionally linked to the positive phototactic behaviour observed in G. pulex infected with P. laevis and Pomphorhynchus tereticollis and in G. insensibilis infected with M. papillorobustus.”
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