BRAIN ASIMMETRY HAS A ROLE IN LONG TERM MEMORY
A small proportion of wild-type Drosophila melanogaster flies has a symmetrical brain which shows two symmetrical structure for both sides, involved in rudimentary cognitive processes, instead of a single one as in the normal type. Alberto Pascual (firstname.lastname@example.org) and his colleagues (Brief Communication in Nature 427, 605 – 606, 12 February 2004) studied anatomical-functional correlation of the difference by comparing the two Drosophila’s type.
The asymmetrical positioning of neural structures on the left or right side of the vertebrate and invertebrate brain has been related to laterality, which is associated with cognitive skills. Until now, this assumption has not been illustrated by strong experimental demonstrations. In the last 12 February communication to Nature, Pascual reports that the symmetrical Drosophila lacks a normal long-term memory, although its short term memory is intact. The authors speculate that brain asymmetry may be required for generating or retrieving long term memory.