. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 50 65 84 100 141 185 244 303 Best Frequency (Hz). 50 65 84 100 141 185 244 Best Frequency (Hz) 303 Figure 1. Frequency distribution.'! of single unit best frequencies (BF) for units recorded in the descending ochival nucleus (DON. A: n = 921 and the torus semicircularis (TS. B: n = 24} of the tuadfish. The numbers along the abscissa give the stimulus tone frequencies used, und the abscissa is approximately logarithmically scaled. levels within a unit's dynamic range (generally between —10 and 30 dB re: 1 nanometer, root mean
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 50 65 84 100 141 185 244 303 Best Frequency (Hz). 50 65 84 100 141 185 244 Best Frequency (Hz) 303 Figure 1. Frequency distribution.'! of single unit best frequencies (BF) for units recorded in the descending ochival nucleus (DON. A: n = 921 and the torus semicircularis (TS. B: n = 24} of the tuadfish. The numbers along the abscissa give the stimulus tone frequencies used, und the abscissa is approximately logarithmically scaled. levels within a unit's dynamic range (generally between —10 and 30 dB re: 1 nanometer, root mean square). Ninety-two units of the DON (23 animals, 6 of which were females), and 24 units of the TS (12 animals, 3 of which were females) have been successfully characterized. A unit's best frequency, or BF, was defined as the stimulus frequency producing the greatest spike rate at the approx- imate center of the unit's dynamic range. Frequency response range was defined as the frequency range within which the unit responded at or above 50% of the maximum spike rate (at BF). Figure 1 shows frequency distributions of BF for the DON units (A-top) and TS units (B-bottom). The lowest BF was 50 Hz (or less), and the highest was 303 Hz (or more). Most BFs were between 100 and 185 Hz. The mode for BF was 18? Hz for DON cells, and 141 H/ for TS cells. There were no differences in the range of BFs for males versus females. The single animal with a BF of 303 was male. While the distributions for both recording sites overlap substantially, relatively fewer units with BFs above 141 Hz were found in the TS. This could be due to sampling error, or it might have resulted from a nonhomogeneous spatial distri- bution of BF within the TS. which was not explored as systemat- ically as the DON. Frequency response area widths averaged 64 Hz for TS and 117 Hz for DON. This difference probably reflects the lower mean BF for the TS distribution. Because the fundamental frequency of the boatwhistles
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
