A second ascending visual pathway from the optic tectum to the telencephalon in the pigeon (Columba livia)

1986 ◽  
Vol 250 (3) ◽  
pp. 296-310 ◽  
Author(s):  
Paul D. R. Gamlin ◽  
David H. Cohen
Keyword(s):  
Optic Tectum ◽  
Columba Livia ◽  
Visual Pathway

Chemically specific retinal ganglion cells collaterlize to the Pars ventralis of the lateral geniculate nucleus and optic tectum in the pigeon (Columba livia)

1989 ◽  
Vol 3 (5) ◽  
pp. 477-482 ◽  
Author(s):  
Luiz R. G. Britto ◽  
Kent T. Keyser ◽  
Dania E. Hamassaki ◽  
Toru Shimizu ◽  
Harvey J. Karten
Keyword(s):  
Retinal Ganglion Cells ◽  
Lateral Geniculate Nucleus ◽  
Optic Tectum ◽  
Ganglion Cells ◽  
Columba Livia ◽  
Retinal Ganglion ◽  
Fluorescent Tracers ◽  
Retinal Axons ◽  
Lateral Geniculate ◽  
Tracing Techniques

AbstractImmunohistochemical and retrograde tracing techniques were combined to study the retinal ganglion cells which project to the pars ventralis of the lateral geniculate nucleus (GLv) in the pigeon. Using two different fluorescent tracers, two histochemically-distinct populations of ganglion cells were found to project to both the GLv and the optic tectum. The first population of ganglion cells exhibited tyrosine hydroxylase-like immunoreactivity and represented about 20% of all ganglion cells which were retrogradely labeled from the GLv. The second population of ganglion cells showed substance P-like immunoreactivity and represented about 13% of all ganglion cells projecting to the GLv. These results confirm earlier suggestions that the retinal axons projecting to the GLv also project elsewhere and demonstrate that heterogeneity of retinal ganglion cells transmitters is evident even within a single retino-recipient nucleus such as the GLv.

scholarly journals Recurrent Antitopographic Inhibition Mediates Competitive Stimulus Selection in an Attention Network

2011 ◽  
Vol 105 (2) ◽  
pp. 793-805 ◽  
Author(s):  
Dihui Lai ◽  
Sebastian Brandt ◽  
Harald Luksch ◽  
Ralf Wessel
Keyword(s):  
Optic Tectum ◽  
Visual Pathway ◽  
Neural Mechanisms ◽  
Stimulus Selection ◽  
It Projects ◽  
Sensory Inputs ◽  
Surround Inhibition ◽  
Input Layer ◽  
Midbrain Structure ◽  
Constrained Model

Topographically organized neurons represent multiple stimuli within complex visual scenes and compete for subsequent processing in higher visual centers. The underlying neural mechanisms of this process have long been elusive. We investigate an experimentally constrained model of a midbrain structure: the optic tectum and the reciprocally connected nucleus isthmi. We show that a recurrent antitopographic inhibition mediates the competitive stimulus selection between distant sensory inputs in this visual pathway. This recurrent antitopographic inhibition is fundamentally different from surround inhibition in that it projects on all locations of its input layer, except to the locus from which it receives input. At a larger scale, the model shows how a focal top-down input from a forebrain region, the arcopallial gaze field, biases the competitive stimulus selection via the combined activation of a local excitation and the recurrent antitopographic inhibition. Our findings reveal circuit mechanisms of competitive stimulus selection and should motivate a search for anatomical implementations of these mechanisms in a range of vertebrate attentional systems.

Parallel organization of the avian sensorimotor arcopallium: Tectofugal visual pathway in the pigeon ( Columba livia )

2019 ◽  
Vol 528 (4) ◽  
pp. 597-623 ◽  
Author(s):  
Máximo Fernández ◽  
Cristian Morales ◽  
Ernesto Durán ◽  
Sara Fernández‐Colleman ◽  
Elisa Sentis ◽  
...  
Keyword(s):  
Columba Livia ◽  
Visual Pathway
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