Octopaminergic modulation of a fly visual motion-sensitive neuron during stimulation with naturalistic optic flow

Rien D, Kern R, Kurtz R (2013)
Frontiers in Behavioral Neuroscience 7.

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Abstract
In a variety of species locomotor activity, like walking or flying, has been demonstrated to alter visual information processing. The neuromodulator octopamine was shown to change the response characteristics of optic flow processing neurons in the fly's visual system in a similar way as locomotor activity. This modulation resulted in enhanced neuronal responses, in particular during sustained stimulation with high temporal frequencies, and in shorter latencies of responses to abrupt onsets of pattern motion. These state-dependent changes were interpreted to adjust neuronal tuning to the range of high velocities encountered during locomotion. Here we assess the significance of these changes for the processing of optic flow as experienced during flight. Naturalistic image sequences were reconstructed based on measurements of the head position and gaze direction of Calliphora vicina flying in an arena. We recorded the responses of the V1 neuron during presentation of these image sequences on a panoramic stimulus device ("FliMax"). Consistent with previous accounts, we found that spontaneous as well as stimulus-induced spike rates were increased by an octopamine agonist and decreased by an antagonist. Moreover, a small but consistent decrease in response latency upon octopaminergic activation was present, which might support fast responses to optic flow cues and limit instabilities during closed-loop optomotor regulation. However, apart from these effects the similarities between the dynamic response properties in the different pharmacologically induced states were surprisingly high, indicating that the processing of naturalistic optic flow is not fundamentally altered by octopaminergic modulation.
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Rien D, Kern R, Kurtz R. Octopaminergic modulation of a fly visual motion-sensitive neuron during stimulation with naturalistic optic flow. Frontiers in Behavioral Neuroscience. 2013;7.
Rien, D., Kern, R., & Kurtz, R. (2013). Octopaminergic modulation of a fly visual motion-sensitive neuron during stimulation with naturalistic optic flow. Frontiers in Behavioral Neuroscience, 7.
Rien, D., Kern, R., and Kurtz, R. (2013). Octopaminergic modulation of a fly visual motion-sensitive neuron during stimulation with naturalistic optic flow. Frontiers in Behavioral Neuroscience 7.
Rien, D., Kern, R., & Kurtz, R., 2013. Octopaminergic modulation of a fly visual motion-sensitive neuron during stimulation with naturalistic optic flow. Frontiers in Behavioral Neuroscience, 7.
D. Rien, R. Kern, and R. Kurtz, “Octopaminergic modulation of a fly visual motion-sensitive neuron during stimulation with naturalistic optic flow”, Frontiers in Behavioral Neuroscience, vol. 7, 2013.
Rien, D., Kern, R., Kurtz, R.: Octopaminergic modulation of a fly visual motion-sensitive neuron during stimulation with naturalistic optic flow. Frontiers in Behavioral Neuroscience. 7, (2013).
Rien, Diana, Kern, Roland, and Kurtz, Rafael. “Octopaminergic modulation of a fly visual motion-sensitive neuron during stimulation with naturalistic optic flow”. Frontiers in Behavioral Neuroscience 7 (2013).
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