tailieunhanh - Advances in Sound Localization part 14

Tham khảo tài liệu 'advances in sound localization part 14', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Directional Hearing in Fishes 507 3. The TS has a columnar organization with similar best axes of horizontal motion tending to be constant within vertical columns Wubbles et al. 1995 Wubbles and Schellart 1998 . 4. Some phase-locked units had phase angles of synchronization that did not vary with the stimulus axis angle except for the expected 180o shift at one angle while others showed a phase shift that varied continuously with stimulus angle over 360o Wubbles and Schellart 1997 . Wubbles and Schellart concluded that those and other results strongly supported the phase model. They speculated that the rostro-caudally oriented units of the medial TS were channels activated by swim bladder-dependent motion input while the diversely oriented units of the lateral TS represented direct motion input to the otolith organs. The utricle was thought to be the otolith organ supplying the direct motion-dependent input because of its horizontal orientation. The authors speculated that the units with synchronization angles independent of stimulus direction represented pressure-dependent swim bladder inputs while the units with variable synchronization phase angles represented direct motion inputs. Wubbles and Schellart 1997 then concluded that .the phase difference between the se two unequivocally encodes the stimulus direction 0-360o . . solves the 180o ambiguity problem . This conclusion would be strengthened by a more clear and detailed explanation for the direction-dependent variation in synchronization angle shown by some units and by a testable theory for the final step that solves the 180o ambiguity. 8. Summary and conclusions 1. There are much data on the accoustical behaviors of several fish species that strongly suggest the capacity directional hearing and sound source localization. Most of these observations indicate the necessity that one or more otolith organs respond to acoustic particle motion. 2. The question of localization in the near- versus far-fields is

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