Abstract
OUR understanding of information processing in nerve nets has been modified by the concept of graded signal transmission1. Descriptions of non-spiking interneurones in insects2–8, and the demonstration of graded synaptic transmission3 have contributed to this development. In the fly visual nervous system, second and higher order interneurones are known, which apparently do not produce action potentials6–8. We show here that at least eight individually identifiable movement-sensitive cells, which have the characteristic properties of non-spiking interneurones2 will generate spikes with imposed hyperpolarisation. Their graded mode of operation is due to maintained refractoriness. This applies selectively to neurones, which belong to either of two anatomically, and physiologically distinct classes. Other cell types in the same preparation generate spikes spontaneously.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
