Superior Colliculus of the Tree Shrew: A Structural and Functional Subdivision into Superficial and Deep Layers

Casagrande, V. A.; Harting, John K.; Hall, William C.; Diamond, Irving T.; Martin, George F.

doi:10.1126/science.177.4047.444

Cited by 230 publications

(69 citation statements)

References 21 publications

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“…In other species, the superficial layers are exclusively visual, and this plasticity may be critical for experience-dependent adjustment of circuits involved in visual processing (Sprague and Meikle, 1965;Casagrande et al, 1972;Tunkl and Berkley, 1977;Sprague, 1991). We propose that these same mechanisms, which normally enable adaptive plasticity of visual circuits, enable auditory map plasticity in barn owls.…”

Section: Plasticity In the Superficial Otmentioning

confidence: 90%

Multiple Sites of Adaptive Plasticity in the Owl's Auditory Localization Pathway

DeBello

Knudsen²

2004

J. Neurosci.

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In the midbrain auditory localization pathway of the barn owl, a map of auditory space is relayed from the external nucleus of the inferior colliculus (ICX) to the deep and intermediate layers of the optic tectum (OT) and from these layers to the superficial layers. Within the OT, the auditory space map aligns with a visual map of space. Raising young barn owls with a prismatic displacement of the visual field leads to progressive changes in auditory tuning in the OT that tend to realign the auditory space map with the prismatically displaced visual space map. The only known site of this adaptive plasticity is in the ICX, in which the auditory system first creates a map of space. In this study, we identified an additional site of plasticity in the OT. In owls that experienced prisms beginning late in the juvenile period, adaptive shifts in auditory tuning in the superficial layers of the OT exceeded the adaptive shifts that occurred in the deep layers of the OT or in the ICX. Anatomical results from these owls demonstrated that the topography of intrinsic OT connections was systematically altered in the adaptive direction. In juvenile owls, plasticity in the OT increased as plasticity in the ICX decreased. Because plasticity at both sites has been shown to decline substantially in adults, these results suggest that an age-dependent decrease in auditory map plasticity occurs first in the ICX and later at the higher level, in the OT.

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Section: Plasticity In the Superficial Otmentioning

confidence: 90%

Multiple Sites of Adaptive Plasticity in the Owl's Auditory Localization Pathway

DeBello

Knudsen²

2004

J. Neurosci.

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“…Although visual information from the retina starts at the superficial superior colliculus, and there are direct connections between the superior and deep layers [9], the former cannot elicit saccade directly [11]. This information has to be subsequently processed by a number of cortical and subcortical structures that place it: 1) in context of attentional bias within egocentric saliency maps (posterior parietal cortex) [12]; 2) the aforementioned IOR [13]; 3) overriding voluntary saccades (frontal eye fields) [9]; and 4) basal ganglia action selection [14].…”

Section: A Brain Areas Involved In Visual Search and Reachingmentioning

confidence: 99%

Integration of Active Vision and Reaching From a Developmental Robotics Perspective

Hülse

McBride

Law

et al. 2010

IEEE Trans. Auton. Mental Dev.

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Abstract-Inspired by child development and brain research, we introduce a computational framework which integrates robotic active vision and reaching. Essential elements of this framework are sensorimotor mappings that link three different computational domains relating to visual data, gaze control, and reaching. The domain of gaze control is the central computational substrate that provides, first, a systematic visual search and, second, the transformation of visual data into coordinates for potential reach actions. In this respect, the representation of object locations emerges from the combination of sensorimotor mappings. The framework is tested in the form of two different architectures that perform visually guided reaching. Systematic experiments demonstrate how visual search influences reaching accuracy. The results of these experiments are discussed with respect to providing a reference architecture for developmental learning in humanoid robot systems.Index Terms-Biologically inspired robot architectures, developmental robotics, robotic active vision and reaching.

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“…Based upon functional considerations [Casagrande et a!., 1972] and the pat tern of anatomical connections [Harting et al, 1973;Lund, 1964Lund, , 1972a comparative neuroanatomists have divided the colliculus into two major divisions: superficial and deep. The superficial layers (stratum zonale, str.…”

Section: Anatomical Organization Of the Superior Colliculusmentioning

confidence: 99%

Neural Cartography: Sensory and Motor Maps in the Superior Colliculus

Sparks¹

1988

Brain Behav Evol

148

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The sudden onset of a novel or behaviorally significant stimulus usually triggers responses that orient the eyes, external ears, head and/or body toward the source of the stimulus. As a consequence, the reception of additional signals originating from the source and the sensory guidance of appropriate limb and body movements are facilitated. Converging lines of evidence, derived from anatomical, electrophysiological and lesion experiments, indicate that the superior colliculus is an important part of the neural substrate responsible for the generation of orienting responses. This paper briefly reviews the functional organization of the mammalian superior colliculus and discusses possible linkages between the sensory and motor maps observed in this structure. The hypothesis is advanced that the sensory maps are organized in motor (not sensory) coordinates and that the maps of sensory space are dynamic, shifting with relative movements of the eyes, head and body.

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Superior Colliculus of the Tree Shrew: A Structural and Functional Subdivision into Superficial and Deep Layers

Cited by 230 publications

References 21 publications

Multiple Sites of Adaptive Plasticity in the Owl's Auditory Localization Pathway

Multiple Sites of Adaptive Plasticity in the Owl's Auditory Localization Pathway

Integration of Active Vision and Reaching From a Developmental Robotics Perspective

Neural Cartography: Sensory and Motor Maps in the Superior Colliculus

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