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First published online August 4, 2005
Journal of Experimental Biology 208, 3121-3131 (2005)
Published by The Company of Biologists 2005
doi: 10.1242/jeb.01742

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Ontogenetic changes in the response properties of individual, primary auditory afferents in the vocal plainfin midshipman fish Porichthys notatus Girard

Joseph A. Sisneros^1,2,* and Andrew H. Bass¹

¹ Department of Neurobiology and Behavior, Cornell University, Ithaca, NY 14853, USA
² Department of Psychology, University of Washington, Seattle, WA 98195, USA

View larger version (171K): [in a new window]   Fig. 1. Dorsal view of midshipman brain and inner ear. Small arrow marks the area of the VIIIs nerve innervating the saccule where recordings were made. C, cerebrum; M, midbrain; T, telencephalon.

View larger version (11K): [in a new window]   Fig. 2. Resting discharge rate histogram of auditory saccular afferent neurons recorded from juvenile and adult midshipman fish (P. notatus). The numbers of animals and auditory saccular afferent neurons tested are indicated, respectively, in parentheses.

View larger version (23K): [in a new window]   Fig. 3. Relationship of resting discharge rate of auditory saccular afferent neurons with standard length (SL) recorded from juvenile and adult midshipman fish. Note that resting discharge rate increases with SL. Values are means ± S.E.M. for each animal.

View larger version (19K): [in a new window]   Fig. 4. Iso-intensity response curves for the entire population of juvenile and adult midshipman auditory saccular afferent neurons to 130 dB (re 1 µPa) iso-intensity tones. The numbers of animals and auditory saccular afferent neurons tested are indicated, respectively, in parentheses. Iso-intensity curves based on vector strength (VS) of synchronization show VS values for each frequency tested in terms of the median (black filled symbols), 25th percentile (bottom bar) and 75th percentile (top bar).

View larger version (11K): [in a new window]   Fig. 5 Best frequency histogram of auditory saccular afferent neurons recorded from juvenile and adult midshipman fish (P. notatus). The distribution of best frequencies (BFs) for auditory saccular afferents is based on the vector strength of synchronization to iso-intensity tones of 130 dB (re 1 µPa). The numbers of animals and auditory saccular afferent neurons tested are indicated, respectively, in parentheses.

View larger version (17K): [in a new window]   Fig. 6. Relationship of auditory threshold (decibels, re 1 µPa) at best frequency (BF) of auditory saccular afferent neurons with standard length (SL) recorded from juvenile and adult midshipman fish. Note that threshold at BF decreases with SL.

View larger version (21K): [in a new window]   Fig. 7. Relationship of vector strength of synchronization at best frequency (BF) with resting discharge rate of auditory saccular afferent neurons recorded from juvenile and adult midshipman fish.

View larger version (31K): [in a new window]   Fig. 8. (A) Representative example of a single grunt recorded at 16°C from a nesting type I male midshipman fish. Bar, 10 ms. (B) Comparison of the power spectrum of the representative grunt shown in A (grey trace) and the frequency sensitivity of auditory saccular afferent neurons recorded from juvenile (small and large) and adult (non-reproductive and reproductive) midshipman fish. (C) Representative example of a growl recorded at 16°C from a nesting type I male midshipman fish. Bar, 500 ms. (D) Comparison of the power spectrum of the representative growl in C (grey trace) and the frequency sensitivity of auditory saccular afferent neurons recorded from juvenile (small and large) and adult (non-reproductive and reproductive) midshipman fish. (E) Representative example of a hum recorded at 16°C from a nesting type I male midshipman fish. Bar, 10 ms. (F) Comparison of the power spectrum of the representative hum in E (grey trace) and the frequency sensitivity of auditory saccular afferent neurons recorded from juvenile (small and large) and adult (non-reproductive and reproductive) midshipman fish. Iso-intensity response curves are based on vector strength (VS) of synchronization to iso-intensity tones of 130 dB (re 1 µPa) and show median VS values for juvenile and adult midshipman (filled circles, squares and triangles from Fig. 4; open triangle, non-reproductive female midshipman fish from Sisneros and Bass, 2003).