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Fig. 2. The receptive field organisation and morphology of the V1 neurone
[receptive field modified from Krapp et al.
(Krapp et al., 2001)]. The
orientation and length of each arrow in the vector map indicates the local
directional motion preference and sensitivity, respectively. The map resembles
the optic flow pattern generated by a rotation of the head about an axis
approximately midway between pitch and roll (nodes at 
45° and
-135° azimuth). The grey box shows the approximate area and position
of the display monitor we used for stimulating the compound eye. Inset: A
schematic drawing of the fly brain, with a camera lucida drawing of a stained
V1 neurone on the right-hand side (courtesy of Klaus Hausen). The approximate
electrode position is indicated by the open arrowhead. Scale bar, 200
µm.
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