The ascending tectofugal visual system in amniotes: New insights

Guirado, Salvador; Real, M. Ángeles; Dávila, José Carlos

doi:10.1016/j.brainresbull.2005.02.015

Cited by 32 publications

(28 citation statements)

References 18 publications

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“…The tectofugal pathway has been suggested to be homologous to the colliculopulvinar-cortical pathway in mammals (Karten, 1969;Karten and Shimizu, 1989) (but see Guirado et al, 2005 for an alternative view). The pathway ascends from the retina to the optic tectum (OT) (the avian homolog of the superior colliculus), which in turn projects to the nucleus rotundus (nRt) (Benowitz and Karten, 1976) of the dorsal thalamus [considered comparable with parts of pulvinar nuclei and lateral posterior complex in the thalamus (Raczkowski and Diamond, 1981;Shimizu and Karten, 1993;Reiner et al, 2005)].…”

Section: Introductionmentioning

confidence: 99%

Auditory and Multisensory Responses in the Tectofugal Pathway of the Barn Owl

Reches¹,

Gutfreund²

2009

J. Neurosci.

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A common visual pathway in all amniotes is the tectofugal pathway connecting the optic tectum with the forebrain. The tectofugal pathway has been suggested to be involved in tasks such as orienting and attention, tasks that may benefit from integrating information across senses. Nevertheless, previous research has characterized the tectofugal pathway as strictly visual. Here we recorded from two stations along the tectofugal pathway of the barn owl: the thalamic nucleus rotundus (nRt) and the forebrain entopallium (E). We report that neurons in E and nRt respond to auditory stimuli as well as to visual stimuli. Visual tuning to the horizontal position of the stimulus and auditory tuning to the corresponding spatial cue (interaural time difference) were generally broad, covering a large portion of the contralateral space. Responses to spatiotemporally coinciding multisensory stimuli were mostly enhanced above the responses to the single modality stimuli, whereas spatially misaligned stimuli were not. Results from inactivation experiments suggest that the auditory responses in E are of tectal origin. These findings support the notion that the tectofugal pathway is involved in multisensory processing. In addition, the findings suggest that the ascending auditory information to the forebrain is not as bottlenecked through the auditory thalamus as previously thought.

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Section: Introductionmentioning

confidence: 99%

Auditory and Multisensory Responses in the Tectofugal Pathway of the Barn Owl

Reches¹,

Gutfreund²

2009

J. Neurosci.

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“…This region corresponds fully to that reported to receive afferentation from both the extrageniculate visual cortical areas and the extrageniculate visual thalamus (Niida, et al, 1997;Harting, et al, 2001;Guirado, et al, 2005;Nagy, et al, 2011). These CN units prefer intermediate or high…”

Section: Visual Information Processing In the Cn Of Monkeysupporting

confidence: 85%

“…In order to test the hypothesis that the activity of CN is modulated by the inputs originating in the ascending tectofugal system, we recorded multiscale neuronal activity simultaneously from SG, a thalamic relay nucleus, which transmits the collicular visual information to other structures of the ascending tectofugal system (Norita & Katoh, 1986;Norita, et al, 1991;Katoh, et al, 1995;MacNeil, et al, 1997;Guirado, et al, 2005) and CN (Harting, et al, 2001) of the feline brain. Our earlier single-cell studies using cross-correlation methods provided the first piece of direct evidence on the functional connection between SG and CN (Rokszin, et al, 2011).…”

Section: Synchronization Between Sg and Cn In Catmentioning

confidence: 99%

Processing of dynamic visual information in the caudate nucleus

Gombkötő¹

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“…Beside the lateral geniculate nucleus, several subcortical structures have been found that receive afferents directly from the retina. Of these structures, the superior colliculus (SC), the neurons of that are the origin of the ascending tectofugal extrastriatal pathway, has attracted the most research interest during the last decades [6]. The SC is a multilayered structure of the mammalian midbrain, that plays an important role in visually guided behavior and is involved in the orienting response of the head and the eyes toward an object of interest of any modality [7].…”

Section: Introductionmentioning

confidence: 99%