《自然》[Nature]13年1月17日出版pdf全文

nero1981

/ C* `. v" D& ]( ?# r7 Q# H
0 Y6 G9 r8 I% M: t# P
9 A* h6 Q) L6 A7 C  Y# ^

- R7 g" j0 P* o& O7 t/ I' \A fruitfly knows right from left when confronted with an asymmetric odour plume. This study demonstrates a neuronal basis for that ability. Rachel Wilson and colleagues show that Drosophila are able to discriminate between odours presented to the right antenna versus the left antenna because each spike arising from the right antenna releases only about two-thirds as much neurotransmitter in the left brain, as compared to the right brain. As a result, central neurons on the right spike a few milliseconds before neurons on the left, and neurons on the right also spike at a slightly higher rate. The brain of a walking fly can detect this subtle asymmetry and initiate a turn to the right before the fly even completes one stride. (Cover: Kelly Krause/Nature — images by Sylvie Bouchard, Dariusz Majgier/Shutterstock)9 O+ ~2 s* M. V3 b

2 h/ q9 k  D: A) Y
; f: E( [4 u( [[hide][/hide]  R9 W' A! g' R% U8 m
% _4 c# v, E# g6 ?4 x