Features of the Retinotopic Representation in the Visual Wulst of a Laterally Eyed Bird, the Zebra Finch (Taeniopygia guttata)

Michael N, Loewel S, Bischof H-J (2015)
PLoS ONE 10(4): e0124917.

Zeitschriftenaufsatz | Veröffentlicht | Englisch
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Michael, Neethu; Loewel, Siegrid; Bischof, Hans-JoachimUniBi
Abstract / Bemerkung
The visual wulst of the zebra finch comprises at least two retinotopic maps of the contralateral eye. As yet, it is not known how much of the visual field is represented in the wulst neuronal maps, how the organization of the maps is related to the retinal architecture, and how information from the ipsilateral eye is involved in the activation of the wulst. Here, we have used auto-fluorescent flavoprotein imaging and classical anatomical methods to investigate such characteristics of the most posterior map of the multiple retinotopic representations. We found that the visual wulst can be activated by visual stimuli from a large part of the visual field of the contralateral eye. Horizontally, the visual field representation extended from -5 degrees beyond the beak tip up to +125 degrees laterally. Vertically, a small strip from -10 degrees below to about +25 degrees above the horizon activated the visual wulst. Although retinal ganglion cells had a much higher density around the fovea and along a strip extending from the fovea towards the beak tip, these areas were not overrepresented in the wulst map. The wulst area activated from the foveal region of the ipsilateral eye, overlapped substantially with the middle of the three contralaterally activated regions in the visual wulst, and partially with the other two. Visual wulst activity evoked by stimulation of the frontal visual field was stronger with contralateral than with binocular stimulation. This confirms earlier electrophysiological studies indicating an inhibitory influence of the activation of the ipsilateral eye on wulst activity elicited by stimulating the contralateral eye. The lack of a foveal overrepresentation suggests that identification of objects may not be the primary task of the zebra finch visual wulst. Instead, this brain area may be involved in the processing of visual information necessary for spatial orientation.
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Michael N, Loewel S, Bischof H-J. Features of the Retinotopic Representation in the Visual Wulst of a Laterally Eyed Bird, the Zebra Finch (Taeniopygia guttata). PLoS ONE. 2015;10(4): e0124917.
Michael, N., Loewel, S., & Bischof, H. - J. (2015). Features of the Retinotopic Representation in the Visual Wulst of a Laterally Eyed Bird, the Zebra Finch (Taeniopygia guttata). PLoS ONE, 10(4), e0124917. doi:10.1371/journal.pone.0124917
Michael, N., Loewel, S., and Bischof, H. - J. (2015). Features of the Retinotopic Representation in the Visual Wulst of a Laterally Eyed Bird, the Zebra Finch (Taeniopygia guttata). PLoS ONE 10:e0124917.
Michael, N., Loewel, S., & Bischof, H.-J., 2015. Features of the Retinotopic Representation in the Visual Wulst of a Laterally Eyed Bird, the Zebra Finch (Taeniopygia guttata). PLoS ONE, 10(4): e0124917.
N. Michael, S. Loewel, and H.-J. Bischof, “Features of the Retinotopic Representation in the Visual Wulst of a Laterally Eyed Bird, the Zebra Finch (Taeniopygia guttata)”, PLoS ONE, vol. 10, 2015, : e0124917.
Michael, N., Loewel, S., Bischof, H.-J.: Features of the Retinotopic Representation in the Visual Wulst of a Laterally Eyed Bird, the Zebra Finch (Taeniopygia guttata). PLoS ONE. 10, : e0124917 (2015).
Michael, Neethu, Loewel, Siegrid, and Bischof, Hans-Joachim. “Features of the Retinotopic Representation in the Visual Wulst of a Laterally Eyed Bird, the Zebra Finch (Taeniopygia guttata)”. PLoS ONE 10.4 (2015): e0124917.

3 Zitationen in Europe PMC

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