Direct projection from the visual associative cortex to the caudate nucleus in the feline brain

Nagy, Anett J.; Berényi, Antal; Gulya, Károly; Norita, Masao; Benedek, György; Nagy, Attila

doi:10.1016/j.neulet.2011.08.007

Cited by 10 publications

(11 citation statements)

References 35 publications

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“…A strong firing rate modulation in response to drifting gratings has also been reported for the CN [36], [40]. We observed a large proportion of AES neurons with a modulated responses and postulate that the strong phase-sensitivity of many CN neurons may result from a direct projection from the AES [63].…”

Section: Discussionsupporting

confidence: 82%

Spectral Characteristics of Phase Sensitivity and Discharge Rate of Neurons in the Ascending Tectofugal Visual System

et al. 2014

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Drifting gratings can modulate the activity of visual neurons at the temporal frequency of the stimulus. In order to characterize the temporal frequency modulation in the cat’s ascending tectofugal visual system, we recorded the activity of single neurons in the superior colliculus, the suprageniculate nucleus, and the anterior ectosylvian cortex during visual stimulation with drifting sine-wave gratings. In response to such stimuli, neurons in each structure showed an increase in firing rate and/or oscillatory modulated firing at the temporal frequency of the stimulus (phase sensitivity). To obtain a more complete characterization of the neural responses in spatiotemporal frequency domain, we analyzed the mean firing rate and the strength of the oscillatory modulations measured by the standardized Fourier component of the response at the temporal frequency of the stimulus. We show that the spatiotemporal stimulus parameters that elicit maximal oscillations often differ from those that elicit a maximal discharge rate. Furthermore, the temporal modulation and discharge-rate spectral receptive fields often do not overlap, suggesting that the detection range for visual stimuli provided jointly by modulated and unmodulated response components is larger than the range provided by a one response component.

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Section: Discussionsupporting

confidence: 82%

Spectral Characteristics of Phase Sensitivity and Discharge Rate of Neurons in the Ascending Tectofugal Visual System

et al. 2014

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“…The involvement of the basal ganglia in ameliorating haemianopia is evident from previous studies whereby manipulations of its projections to the deep SC reverses haemianopia 61 , presumably by altering a pathway critical for the bilateral coordination of midbrain visuomotor activity 62 . Given that the basal ganglia also receives direct projections from AES 51,63 , understanding how cross-modal training impacts this broader architecture will likely provide additional insights into its underlying mechanisms. Of particular concern in future studies is how cross-modal training achieves a proper balance among the components of this architecture that is necessary to produce the coordinated visuomotor behaviours observed here.…”

Section: Discussionmentioning

confidence: 99%

Multisensory training reverses midbrain lesion-induced changes and ameliorates haemianopia

2015

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Failure to attend to visual cues is a common consequence of visual cortex injury. Here, we report on a behavioural strategy whereby cross-modal (auditory–visual) training reinstates visuomotor competencies in animals rendered haemianopic by complete unilateral visual cortex ablation. The re-emergence of visual behaviours is correlated with the reinstatement of visual responsiveness in deep layer neurons of the ipsilesional superior colliculus (SC). This functional recovery is produced by training-induced alterations in descending influences from association cortex that allowed these midbrain neurons to once again transform visual cues into appropriate orientation behaviours. The findings underscore the inherent plasticity and functional breadth of phylogenetically older visuomotor circuits that can express visual capabilities thought to have been subsumed by more recently evolved brain regions. These observations suggest the need for reevaluating current concepts of functional segregation in the visual system and have important implications for strategies aimed at ameliorating trauma-induced visual deficits in humans.

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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: 84%

“…However, an increasing body of evidence is currently accumulating in support of the role of extrageniculate pathways of tectal origin in the sensorimotor integration processes of the basal ganglia (Hoshino, et al, 2009;Nagy, et al, 2003;Nagy, et al, 2008). The dorsolateral aspect of the caudate body in the cat can receive its visual afferentation from the tectum via the suprageniculate nucleus of the thalamus (Harting, et al, 2001;Nagy, et al, 2003;Rokszin, et al, 2011) Recently, a direct projection from the visual association cortex to the caudate nucleus in the feline brain has also been described (Nagy, et al, 2011). The visual inputs of the substantia nigra may originate from the caudate nucleus (Rodríguez, et al, 2000) and from direct (Comoli, et al, 2003) or indirect tectal pathways through the subthalamic nucleus (Kita & Kitai, 1987;Tokuno, et al, 1994;Jiang, et al, 2003) and the pedunculopontine tegmental nucleus (Redgrave, et al, 1987;Lokwan, et al, 1999).…”

Section: Anatomical Connections Between the Caudate Nucleus And Othermentioning

confidence: 99%

Processing of dynamic visual information in the caudate nucleus

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Direct projection from the visual associative cortex to the caudate nucleus in the feline brain

Cited by 10 publications

References 35 publications

Spectral Characteristics of Phase Sensitivity and Discharge Rate of Neurons in the Ascending Tectofugal Visual System

Spectral Characteristics of Phase Sensitivity and Discharge Rate of Neurons in the Ascending Tectofugal Visual System

Multisensory training reverses midbrain lesion-induced changes and ameliorates haemianopia

Processing of dynamic visual information in the caudate nucleus

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