The Optic Tectum

@inproceedings{Northmore2009TheOT,
  title={The Optic Tectum},
  author={David P. M. Northmore},
  year={2009}
}
The optic tectum forms the roof of the midbrain and is the primary visual center in fishes. The retina and input from other sensory modalities (auditory, lateral line, somatosensory, electrosensory) are mapped topographically over tectum, where the locations of objects and events in body-centered space are represented. Tectum, via its connections to premotor centers, controls eye movements, approach and avoidance movements. In teleosts especially, tectum is a highly developed neural processor… 

Figures from this paper

The role of the optic tectum for visually evoked orienting and evasive movements
TLDR
The mechanisms underlying the selection between approaching and evasive movements are investigated and it is suggested that visual decision-making circuits had evolved in the common ancestor of vertebrates and have been conserved throughout vertebrate phylogeny.
Direction selectivity in the visual system of the zebrafish larva
TLDR
Recent findings and controversies on the zebrafish tectum’s role in extracting directional features from moving visual scenes are reviewed and some controversies are discussed.
On the organization of receptive fields of retinal spot detectors projecting to the fish tectum: Analogies with the local edge detectors in frogs and mammals
TLDR
Responses of ON‐ and OFF‐ganglion cells (GCs) were recorded extracellularly from their axon terminals in the medial sublamina of tectal retino‐recipient layer of immobilized cyprinid fish, referring to these fish GCs as spot detectors (SDs) by analogy with the frog SD.
Updated functional segregation of retinal ganglion cell projections in the tectum of a cyprinid fish—further elaboration based on microelectrode recordings
TLDR
Electrophysiological method allows to indirectly clarify and make precise the morphology of the retino-tectal connections and to establish a morpho-physiological correspondence.
Evolution of neural processing for visual perception in vertebrates
  • E. Knudsen
  • Biology, Psychology
    The Journal of comparative neurology
  • 2020
TLDR
This review compares, across classes of vertebrates, the functional and anatomical characteristics of the neural pathways that process visual information about objects, and stimulus selection pathways that determine the objects to which an animal attends.
Coding Schemes in the Archerfish Optic Tectum
TLDR
The structure of early visual processing in the archerfish, which harnesses its extreme visual ability to hunt by shooting water jets at prey hanging on vegetation above the water, is studied to better understand the early visualprocessing system across vertebrates.
The visual system of a Palaeognathous bird: Visual field, retinal topography and retino‐central connections in the Chilean Tinamou (Nothoprocta perdicaria)
TLDR
The visual field, the retinal topography, and the pattern of retinal and centrifugal projections in the Chilean tinamou are investigated, stressing the conserved character of the visual projections' pattern within the avian clade.
Distribution of the cholinergic nuclei in the brain of the weakly electric fish, Apteronotus leptorhynchus: Implications for sensory processing
TLDR
The present study describes the spatial distribution of cholinergic neurons throughout the brain of the weakly electric fish, Apteronotus leptorhynchus, using in situ hybridization of choline acetyltransferase mRNA and finds that the octavolateral efferent (OE) nucleus is the likely source ofcholinergic fibers innervating the ELL.
...
...

References

SHOWING 1-10 OF 22 REFERENCES
Activity-dependent mapping in the retinotectal projection
Visual and saccadic activity in the goldfish torus longitudinalis
  • D. Northmore
  • Biology, Psychology
    Journal of Comparative Physiology A
  • 2004
TLDR
It was concluded that the photic responses in one TL derive from a topographic input from the ipsilateral tectum, probably generated by a population of neurons different from those responsible for the saccadic responses.
Responses of the teleostean nucleus isthmi to looming objects and other moving stimuli
TLDR
The results suggest that NI signals changes in motion of objects relative to the fish, and estimates the proximity of approaching objects.
Influencing and Interpreting Visual Input: The Role of a Visual Feedback System
TLDR
The optic tectum (superior colliculus in mammals) (OT/SC) has long helped vertebrates to visually identify moving objects and orient toward attractive ones or escape if the objects seem threatening.
Comparative Neurology of the Optic Tectum
1 Reinherz EL, Kung PC, Pesardo JM, Ritz J, Goldstein G, Schlossman SF. Ia determinants on human T-cell subsets defined by monoclonal antibody. Activation stimuli required for expression. J Exp Med
...
...