Tectotectal connectivity in goldfish

Herrero, L.; Pérez, Pablo Toribio; Abades, P Núnez; Hardy, O.; Torres, Blas

doi:10.1002/(sici)1096-9861(19990830)411:3<455::aid-cne8>3.0.co;2-7

Cited by 21 publications

(18 citation statements)

References 40 publications

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“…In a few cases, we identified neurons with an axon that crossed the dorsal midline through the tectal commissure (Fig. 4 H, arrowhead) (Herrero et al, 1999), which was consistent with the GFP expression in the transgenic embryos (Fig. 1 D, E).…”

Section: Mapping Of Tectobulbar Projectionssupporting

confidence: 72%

Genetic Single-Cell Mosaic Analysis Implicates ephrinB2 Reverse Signaling in Projections from the Posterior Tectum to the Hindbrain in Zebrafish

Satō¹,

Hamaoka²,

Aizawa³

et al. 2007

J. Neurosci.

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The optic tectum is a visual center in vertebrates. It receives topographically ordered visual inputs from the retina in the superficial layers and then sends motor outputs from the deeper layers to the premotor reticulospinal system in the hindbrain. Although the topographic patterns of the retinotectal projection are well known, it is not yet well understood how tectal efferents in the tectobulbar tract project to the hindbrain. The retinotectal and the tectobulbar projections were visualized in a zebrafish stable transgenic line Tg(brn3a-hsp70:GFP). Using a single-neuron labeling system in combination with the cre/loxP and Gal4/UAS systems, we showed that the tectal neurons that projected to rhombomeres 2 and 6 were distributed with distinctive patterns along the anterior-posterior axis. Furthermore, we found that ephrinB2a was critically involved in increasing the probability of neurons projecting to rhombomere 2 through a reverse signaling mechanism. These results may provide a neuroanatomical and molecular basis for the motor command map in the tectum.

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Section: Mapping Of Tectobulbar Projectionssupporting

confidence: 72%

Genetic Single-Cell Mosaic Analysis Implicates ephrinB2 Reverse Signaling in Projections from the Posterior Tectum to the Hindbrain in Zebrafish

Satō¹,

Hamaoka²,

Aizawa³

et al. 2007

J. Neurosci.

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“…Furthermore in many vertebrate taxa connections between the left and right tecta via the tectal commissure include both excitatory and inhibitory components [21], [22], [23]. Another possible explanation for poor performance in the contralateral occlusion condition concerns the possibility that multimodal tectal networks in Gloydius perform on the basis of “winner takes all” when inputs from different sensory modalities differ as has been shown in other species [24].…”

Section: Discussionmentioning

confidence: 99%

Reduced Performance of Prey Targeting in Pit Vipers with Contralaterally Occluded Infrared and Visual Senses

et al. 2012

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Both visual and infrared (IR) senses are utilized in prey targeting by pit vipers. Visual and IR inputs project to the contralateral optic tectum where they activate both multimodal and bimodal neurons. A series of ocular and pit organ occlusion experiments using the short-tailed pit viper (Gloydius brevicaudus) were conducted to investigate the role of visual and IR information during prey targeting. Compared with unoccluded controls, snakes with either both eyes or pit organs occluded performed more poorly in hunting prey although such subjects still captured prey on 75% of trials. Subjects with one eye and one pit occluded on the same side of the face performed as well as those with bilateral occlusion although these subjects showed a significant targeting angle bias toward the unoccluded side. Performance was significantly poorer when only a single eye or pit was available. Interestingly, when one eye and one pit organ were occluded on opposite sides of the face, performance was poorest, the snakes striking prey on no more than half the trials. These results indicate that, visual and infrared information are both effective in prey targeting in this species, although interference between the two modalities occurs if visual and IR information is restricted to opposite sides of the brain.

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“…Second, we found that while the spontaneous activity is generated intrinsically, the rhythmic patterns result from inputs from retinotectal (visual system) and hindbrain-tectal (mechanosensory system) projections. However, we can not rule out the possibility of contribution from other sources such as the forebrain30 and/or the other tectum31. However, these structures are less likely the sources providing strong patterned spontaneous input because their anatomical connections are smaller32.…”

Section: Discussionmentioning

confidence: 88%

Global Hyper-synchronous Spontaneous Activity in the Developing Optic Tectum

Imaizumi

Shih

Farris

2013

Sci Rep

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Studies of patterned spontaneous activity can elucidate how the organization of neural circuits emerges. Using in vivo two-photon Ca2+ imaging, we studied spatio-temporal patterns of spontaneous activity in the optic tectum of Xenopus tadpoles. We found rhythmic patterns of global synchronous spontaneous activity between neurons, which depends on visual experience and developmental stage. By contrast, synchronous spontaneous activity between non-neuronal cells is mediated more locally. To understand the source of the neuronal spontaneous activity, input to the tectum was systematically removed. Whereas removing input from the visual or mechanosensory system alone had little effect on patterned spontaneous activity, removing input from both systems drastically altered it. These results suggest that either input is sufficient to maintain the intrinsically generated spontaneous activity and that patterned spontaneous activity results from input from multisensory systems. Thus, the amphibian midbrain differs from the mammalian visual system, whose spontaneous activity is controlled by retinal waves.

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Tectotectal connectivity in goldfish

Cited by 21 publications

References 40 publications

Genetic Single-Cell Mosaic Analysis Implicates ephrinB2 Reverse Signaling in Projections from the Posterior Tectum to the Hindbrain in Zebrafish

Genetic Single-Cell Mosaic Analysis Implicates ephrinB2 Reverse Signaling in Projections from the Posterior Tectum to the Hindbrain in Zebrafish

Reduced Performance of Prey Targeting in Pit Vipers with Contralaterally Occluded Infrared and Visual Senses

Global Hyper-synchronous Spontaneous Activity in the Developing Optic Tectum

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