- Howarth (1975) - Heat Production in Non-Myelinated Nerves. A short review with comments.
- Gallup and Eldakar (2013) - The thermoregulatory theory of yawning- what we know from over 5 years of research. We yawn to cool our brain!
- Cohen et al (1970) - Changes in axon birefringence during the action potential. Suggestive of structural changes in the axon during the spike.