The visual wulst is the telencephalic target of the avian thalamofugal visual system. It contains several retinotopically organised representations of the contralateral visual field. We used optical imaging of intrinsic signals, electrophysiological recordings, and retrograde tracing with two fluorescent tracers to evaluate properties of these representations in the zebra finch, a songbird with laterally placed eyes. Our experiments revealed that there is some variability of the neuronal maps between individuals and also concerning the number of detectable maps. It was nonetheless possible to identify three different maps, a posterolateral, a posteromedial, and an anterior one, which were quite constant in their relation to each other. The posterolateral map was in contrast to the two others constantly visible in each successful experiment. The topography of the two other maps was mirrored against that map. Electrophysiological recordings in the anterior and the posterolateral map revealed that all units responded to flashes and to moving bars. Mean directional preferences as well as latencies were different between neurons of the two maps. Tracing experiments confirmed previous reports on the thalamo-wulst connections and showed that the anterior and the posterolateral map receive projections from separate clusters within the thalamic nuclei. Maps are connected to each other by wulst intrinsic projections. Our experiments confirm that the avian visual wulst contains several separate retinotopic maps with both different physiological properties and different thalamo-wulst afferents. This confirms that the functional organization of the visual wulst is very similar to its mammalian equivalent, the visual cortex.

Multiple visual field representations in the visual wulst of a laterally eyed bird, the zebra finch (Taeniopygia guttata) / Bischof, Hans-joachim Karl; Eckmeier, Dennis; Keary, Nina; Löwel, Siegrid; Mayer, Uwe; Michael, Neethu. - In: PLOS ONE. - ISSN 1932-6203. - 11:5(2016), pp. e0154927.1-e0154927.23. [10.1371/journal.pone.0154927]

Multiple visual field representations in the visual wulst of a laterally eyed bird, the zebra finch (Taeniopygia guttata)

Bischof, Hans-joachim Karl;Mayer, Uwe;
2016-01-01

Abstract

The visual wulst is the telencephalic target of the avian thalamofugal visual system. It contains several retinotopically organised representations of the contralateral visual field. We used optical imaging of intrinsic signals, electrophysiological recordings, and retrograde tracing with two fluorescent tracers to evaluate properties of these representations in the zebra finch, a songbird with laterally placed eyes. Our experiments revealed that there is some variability of the neuronal maps between individuals and also concerning the number of detectable maps. It was nonetheless possible to identify three different maps, a posterolateral, a posteromedial, and an anterior one, which were quite constant in their relation to each other. The posterolateral map was in contrast to the two others constantly visible in each successful experiment. The topography of the two other maps was mirrored against that map. Electrophysiological recordings in the anterior and the posterolateral map revealed that all units responded to flashes and to moving bars. Mean directional preferences as well as latencies were different between neurons of the two maps. Tracing experiments confirmed previous reports on the thalamo-wulst connections and showed that the anterior and the posterolateral map receive projections from separate clusters within the thalamic nuclei. Maps are connected to each other by wulst intrinsic projections. Our experiments confirm that the avian visual wulst contains several separate retinotopic maps with both different physiological properties and different thalamo-wulst afferents. This confirms that the functional organization of the visual wulst is very similar to its mammalian equivalent, the visual cortex.
5
Bischof, Hans-joachim Karl; Eckmeier, Dennis; Keary, Nina; Löwel, Siegrid; Mayer, Uwe; Michael, Neethu
Multiple visual field representations in the visual wulst of a laterally eyed bird, the zebra finch (Taeniopygia guttata) / Bischof, Hans-joachim Karl; Eckmeier, Dennis; Keary, Nina; Löwel, Siegrid; Mayer, Uwe; Michael, Neethu. - In: PLOS ONE. - ISSN 1932-6203. - 11:5(2016), pp. e0154927.1-e0154927.23. [10.1371/journal.pone.0154927]
File in questo prodotto:
File Dimensione Formato  
Bischof et al 2010 multiple visual plos one.PDF

Solo gestori archivio

Tipologia: Versione editoriale (Publisher’s layout)
Licenza: Creative commons
Dimensione 3.11 MB
Formato Adobe PDF
3.11 MB Adobe PDF   Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11572/174438
Citazioni
  • ???jsp.display-item.citation.pmc??? 1
  • Scopus 11
  • ???jsp.display-item.citation.isi??? 10
social impact