*** Appendix - What is currently known about internal representations in Drosophila

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*** SUMMARY of conclusions reached

Heisenberg (personal email, 15 October 2003) summarises the current state of research into internal representations in the brain of Drosophila:

The motor program for turning in flight, by comparison to other insects, is most likely in the mesothoracic neuromeres of the ventral ganglion in the thorax. We hypothesize that the motor program for turning in flight has a representation in the brain. However, we know nearly nothing about it. We have a mutant, no-bridge-KS49, which by all available criteria (e.g. mosaic studies) is impaired in the central brain and not in the thorax. This mutant in the yaw torque learning experiment can avoid the heat but has no aftereffect. In other words, the motor program snaps back to the whole yaw torque range as soon as the heat is turned off. We take this as a first hint to argue that the restriction of the yaw torque range in the heat training occurs in the brain at an organizational layer above the motor program itself.

A representation of a motor program in the brain makes little sense if it does not contain, in some sense, the possible consequences of this motor program.

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*** SUMMARY of conclusions reached