### Meeting Abstract

**P3.156** Friday, Jan. 6 **Electrolocation Measure in Weakly Electric Fish** *KIM, D.*; SIM, S.; Yonsei University, Seoul* daeeun@yonsei.ac.kr

There have been many approaches to explain the electrolocation process in weakly electric fish. A collection of electroreceptors along the rostrocaudal line can read the electric potential perturbed by a target object. The rotrocaudal position of the target can be simply estimated with the position of the maximum amplitude in the sensor readings. The lateral distance estimation needs non-trivial measures. Two representative measures are the maximum slope-to-maximum amplitude, and FWHM (Full Width at Half Maximum). The first measure has been suggested for the electrolocation with the pulse-type electric fish and the second with the wave-type. Our modeling studies suggest the the first measure can be applied to the electrolocation process for the wave-type electric fish. If we take the inverse of the slope-to-amplitude, the measure becomes similar to the FWHM. More exactly, the measure is simplified to the distance between the point with the maximum peak amplitude and zero crossing point in the electrosensor readings along the rostrocaudal line. From this analysis, the electrolocation measure can approximately localize a target object. This result is consistent with other modeling approaches for weakly electric fish, and also has the theoretical foundation in the analysis of electric field.