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1 Psychological and Brain Sciences, Johns Hopkins University, Baltimore, MD, USA
2 Biology, University of Utah, Salt Lake City, UT, USA
* To whom correspondence should be addressed. E-mail: eric.fortune{at}jhu.edu.
Regenerative processes enhance PSP amplitude and behaviorally-relevant temporal filtering in more than one-third of electrosensory neurons in the torus semicircularis of Eigenmannia. Data from in vivo, current-clamp intracellular recordings indicate that these 'regenerative PSPs' can be divided into two groups based on their half-amplitude durations: constant duration (CD) and variable duration (VD) PSPs. CD PSPs have half-amplitude durations of between 20 and 60 msec that do not vary in relation to stimulus periodicity. In contrast, the half-amplitude durations of VD PSPs vary in relation to stimulus periodicity and range from approximately 10 to 500 msec. Injection of 0.1 nA sinusoidal current through the recording electrode demonstrated that CD PSPs and not VD PSPs can be elicited by voltage fluctuations alone. In addition, CD PSPs were blocked by intracellular application of either QX-314 or QX-222, whereas VD PSPs were not. These in vivo data suggest, therefore, that CD PSPs are mediated by voltage-dependent Na+ conductances.
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