Neuronal representation of visual motion and orientation in the fly medulla

Spalthoff C, Gerdes R, Kurtz R (2012)
Frontiers in Neural Circuits 6: 72.

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Zeitschriftenaufsatz | Veröffentlicht | Englisch
Abstract / Bemerkung
In insects, the first extraction of motion and direction clues from local brightness modulations is thought to take place in the medulla. However, whether and how these computations are represented in the medulla stills remain widely unknown, because electrical recording of the neurons in the medulla is difficult. As an effort to overcome this difficulty, we employed local electroporation in vivo in the medulla of the blowfly (Calliphora vicina) to stain small ensembles of neurons with a calcium-sensitive dye. We studied the responses of these neuronal ensembles to spatial and temporal brightness modulations and found selectivity for grating orientation. In contrast, the responses to the two opposite directions of motion of a grating with the same orientation were similar in magnitude, indicating that strong directional selectivity is either not present in the types of neurons covered by our data set, or that direction-selective signals are too closely spaced to be distinguished by our calcium imaging. The calcium responses also showed a bell-shaped dependency on the temporal frequency of drifting gratings, with an optimum higher than that observed in one of the subsequent processing stages, i.e., the lobula plate. Medulla responses were elicited by on- as well as off-stimuli with some spatial heterogeneity in the sensitivity for “on” and “off”, and in the polarity of the responses. Medulla neurons thus show similarities to some established principles of motion and edge detection in the vertebrate visual system.
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Frontiers in Neural Circuits
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6
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72
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Article Processing Charge funded by the Deutsche Forschungsgemeinschaft and the Open Access Publication Fund of Bielefeld University.
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Spalthoff C, Gerdes R, Kurtz R. Neuronal representation of visual motion and orientation in the fly medulla. Frontiers in Neural Circuits. 2012;6:72.
Spalthoff, C., Gerdes, R., & Kurtz, R. (2012). Neuronal representation of visual motion and orientation in the fly medulla. Frontiers in Neural Circuits, 6, 72. doi:10.3389/fncir.2012.00072
Spalthoff, C., Gerdes, R., and Kurtz, R. (2012). Neuronal representation of visual motion and orientation in the fly medulla. Frontiers in Neural Circuits 6, 72.
Spalthoff, C., Gerdes, R., & Kurtz, R., 2012. Neuronal representation of visual motion and orientation in the fly medulla. Frontiers in Neural Circuits, 6, p 72.
C. Spalthoff, R. Gerdes, and R. Kurtz, “Neuronal representation of visual motion and orientation in the fly medulla”, Frontiers in Neural Circuits, vol. 6, 2012, pp. 72.
Spalthoff, C., Gerdes, R., Kurtz, R.: Neuronal representation of visual motion and orientation in the fly medulla. Frontiers in Neural Circuits. 6, 72 (2012).
Spalthoff, Christian, Gerdes, Ralf, and Kurtz, Rafael. “Neuronal representation of visual motion and orientation in the fly medulla”. Frontiers in Neural Circuits 6 (2012): 72.
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2012-10-12T11:30:15Z

8 Zitationen in Europe PMC

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From the Eye to the Brain: Development of the Drosophila Visual System.
Nériec N, Desplan C., Curr Top Dev Biol 116(), 2016
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Wystrach A, Dewar AD, Graham P., Curr Biol 24(2), 2014
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Collett TS, Lent DD, Graham P., Philos Trans R Soc Lond B Biol Sci 369(1636), 2014
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Berón de Astrada M, Bengochea M, Sztarker J, Delorenzi A, Tomsic D., Curr Biol 23(15), 2013
PMID: 23831291
Enhancement of prominent texture cues in fly optic flow processing.
Kurtz R., Front Neural Circuits 6(), 2012
PMID: 23112763

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