1. 1. Average entropy, percent total entropy, and the variability of entropy (standard deviation, coefficient of variation) were calculated on the basis of inequality test techniques that encode the serial relationships of 2-5 neuronal action potential intervals as a series of symbols. 2. 2. These entropy measures correlated with the number of patterns (symbol groups) whose probability of occurrence changed in a statistically significant manner in response to ethanol injections. 3. 3. The overall 'message,' or at least the change in the 'message' induced by ethanol injections, seems to have been encoded by the relative changes in the probability of occurrence of certain quadgrams (i.e. a grouping of four symbols based on the serial order relationship of five intervals). The ethanol induced 'message' may be based on the combination of certain quadgrams that increase in incidence and those that decrease in incidence (i.e. the quadgrams whose incidence changes in opposite directions, may be 'linked' in some way). This suggests some higher order pattern analysis or 'byte' processing by neurons in the central nervous system. © 1980.
- Nervous System Physiological Phenomena
- Information Theory
- Synaptic Transmission
- In Vitro Techniques
- Action Potentials