222
could be detected by the toadfish ear. Although the indirect input to the toadfish
ear would not improve hearing sensitivity (nor extend the frequency range), the
indirect input could provide phase information; therefore, the phase model of
sound source localization first described for cod (Schuijf 1976) may apply to
other teleost species as well. A better understanding of the potential role of the
gas bladder in sound source localization in teleosts should be explored, ideally as
a multi-species comparison of morphological variations in the gas bladder-ear
association with the ability to localize a sound source under natural conditions.
Acknowledgements Arthur Popper gave a great gift to his graduate students—freedom to pursue
what interested them about fish hearing. If components of the research were out of his area of
expertise, he introduced the student to someone who could provide training and advice. Therefore,
I thank him for his guidance and for introducing me to Catherine McCormick and Catherine Carr, 
both of whom provided critical instruction and feedback for the anatomical studies on O. tau completed in Arthur’s lab. In addition, Arthur encouraged students to present their research and initiate 
interactions that might (and did) lead to post-doctoral collaborations, in my case, with Steve
Highstein  and  Richard  Fay.  I  gratefully  acknowledge  the  instruction  and  guidance  that  Steve 
Highstein provided at the MBL, in particular, on surgical techniques and intracellular label injection using “Alfred.”
All of the physiological work described here was conducted with Richard Fay, a close collaborator in every sense of the word. He was never one to direct research from afar—he was in the lab for 
nearly every experiment, “sweating the small stuff,” as only the best scientists do. About 10 years 
ago, Dick Fay said “We know far less than we think we do about hearing in fish.” No doubt there
is much to learn. As many will state in this volume, his ideas and hypotheses have driven a diverse
array of projects and stimulated many spirited discussions. There will be no end to his influence on
research into the sense of hearing in fishes.
The  work  on  the  auditory  pathway  and  hearing  in  toadfish  was  funded  by  an  NIMH  NRSA 
predoctoral fellowship to PL Edds-Walton; NIH NIDCD Program Project grants to SM Highstein 
and RR Fay, on which PL Edds-Walton was a post-doctoral scientist; and NIH NIDCD grants to 
RR Fay, on which PL Edds-Walton was a Research Associate or Co-principal Investigator. Lastly, 
I am grateful for the support of my husband and son over the past 20 years, for participating in my 
annual migrations to the MBL, cheering me up on difficult days, and understanding that some days 
the toadfish had to come first.
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P.L. Edds-Walton
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