Abstract
Recent behavioural studies have demonstrated that honeybees use visual feedback to stabilize their gaze. However, little is known about the neural circuits that perform the visual motor computations that underlie this ability. We investigated the motor neurons that innervate two neck muscles (m44 and m51), which produce stabilizing yaw movements of the head. Intracellular recordings were made from five (out of eight) identified neuron types in the first cervical nerve (IK1) of honeybees. Two motor neurons that innervate muscle 51 were found to be direction-selective, with a preference for horizontal image motion from the contralateral to the ipsilateral side of the head. Three neurons that innervate muscle 44 were tuned to detect motion in the opposite direction (from ipsilateral to contralateral). These cells were binocularly sensitive and responded optimally to frontal stimulation. By combining the directional tuning of the motor neurons in an opponent manner, the neck motor system would be able to mediate reflexive optomotor head turns in the direction of image motion, thus stabilising the retinal image. When the dorsal ocelli were covered, the spontaneous activity of neck motor neurons increased and visual responses were modified, suggesting an ocellar input in addition to that from the compound eyes.
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Acknowledgments
To our knowledge, the first people to record from neurons in IK1 were Christopher J. Pomfrett and Lesley J. Goodman (unpublished observations). This preliminary work motivated the present study. The LED-based visual stimulator was developed by Dr Gert Stange. Dr Richard Berry developed the three-dimensional model of the bee neck used to generate Fig. 1a, b.
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Hung, YS., van Kleef, J.P. & Ibbotson, M.R. Visual response properties of neck motor neurons in the honeybee. J Comp Physiol A 197, 1173–1187 (2011). https://doi.org/10.1007/s00359-011-0679-9
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DOI: https://doi.org/10.1007/s00359-011-0679-9