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STRUCTURAL AND FUNCTIONAL EVIDENCE FOR ACOUSTIC-LATERAL LINE INTERACTIONS IN A VOCAL FISH

We have been studying the lateral line system of the plainfin midshipman Porichthys notatus, with an emphasis on possible interactions with the auditory system. Males produce low-frequency (-100 Hz) sounds to attract females to their nests. While physiological studies have identified auditory neurons that encode these signals (Bodnar and Bass 1997, 1999, 2001, McKibben and Bass 1999), the role, if any, of the lateral line system in auditory processing is unknown. Our lab has mapped the ascending lateral line and auditory systems in midshipman and identified areas of anatomical overlap between the two (Bass et al. 2000, Weeg and Bass 2000). We have also studied the response properties of the peripheral lateral line system and have identified units which respond to a frequency range that includes midshipman vocalisations. Combined, these data suggest that the auditory and lateral line systems could both be involved in the processing of acoustic signals by midshipman.