Properties of electroantennograms in flies.

By varying the positions of electrodes on the antenna, it was revealed that EAGs from globular antennae measure the summated receptor potentials over the cuticula of olfactory receptor neurons near the electrode. Two effects of acids were found: 1. Using low doses of acids, EAGs reflect the physiological responses of olfactory receptor cells. 2. High doses of strong acids induce electrochemical potentials of the electrodes that vary in strength and polarity, depending on unknown factors. Therefore care should be taken in interpreting responses to these stimuli