Connections between the trigeminal mesencephalic nucleus and the superior colliculus in the rat

Ndiaye, Awa; Pinganaud, Gabrielle; VanderWerf, Frans; Buisseret-Delmas, C.; Buisseret, P

doi:10.1016/s0304-3940(00)01519-6

Cited by 30 publications

(15 citation statements)

References 18 publications

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“…Therefore, fast neural processes (i.e., computing visual maps for reaching) are likely to rely on corollary discharge or, alternatively, on oculoproprioceptive input available upstream the somatosensory cortex. Subcortical structures that could provide oculoproprioceptive signals for visually guided reaching are the superior colliculus, which in rats is connected to the trigeminal nucleus (Ndiaye, Pinganaud, VanderWerf, Buisseret-Delmas, & Buisseret, 2000) or the central thalamus that in the monkey contains neurons sensitive to eye position which discharge after a saccade (Tanaka, 2007). In contrast, neural processes that take longer (i.e., computing the priority map for perception) may accommodate the delay in the ascending proprioceptive pathways and benefit from a more robust estimate of eye position by incorporating the oculoproprioceptive input from the somatosensory cortex.…”

Section: Implications Of the Current Findings For Understanding The Cmentioning

confidence: 99%

Role of Oculoproprioception in Coding the Locus of Attention

Odoj

Balslev

2015

Journal of Cognitive Neuroscience

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Abstract■ The most common neural representations for spatial attention encode locations retinotopically, relative to center of gaze. To keep track of visual objects across saccades or to orient toward sounds, retinotopic representations must be combined with information about the rotation of one's own eyes in the orbits. Although gaze input is critical for a correct allocation of attention, the source of this input has so far remained unidentified. Two main signals are available: corollary discharge (copy of oculomotor command) and oculoproprioception (feedback from extraocular muscles). Here we asked whether the oculoproprioceptive signal relayed from the somatosensory cortex contributes to coding the locus of attention. We used continuous theta burst stimulation (cTBS) over a human oculoproprioceptive area in the postcentral gyrus (S1 EYE ). S1 EYE -cTBS reduces proprioceptive processing, causing ∼1°underestimation of gaze angle. Participants discriminated visual targets whose location was cued in a nonvisual modality. Throughout the visual space, S1 EYE -cTBS shifted the locus of attention away from the cue by ∼1°, in the same direction and by the same magnitude as the oculoproprioceptive bias. This systematic shift cannot be attributed to visual mislocalization. Accuracy of open-loop pointing to the same visual targets, a function thought to rely mainly on the corollary discharge, was unchanged. We argue that oculoproprioception is selective for attention maps. By identifying a potential substrate for the coupling between eye and attention, this study contributes to the theoretical models for spatial attention. ■

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Section: Implications Of the Current Findings For Understanding The Cmentioning

confidence: 99%

Role of Oculoproprioception in Coding the Locus of Attention

Odoj

Balslev

2015

Journal of Cognitive Neuroscience

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“…Single cell recordings in nonhuman primates have uncovered a pathway that relays the efference copy from the superior colliculus via the medial-dorsal thalamic nucleus to the cortex (Sommer and Wurtz, 2008). For eye proprioception, the subcortical pathways are less well understood, but similar with those for the efference copy, are likely to include the superior colliculus (Ndiaye et al, 2000) or the central thalamus (Tanaka, 2007), structures which are therefore plausible candidates for where the two signals converge. However, mapping the neural structures that respond to the mismatch between proprioception and efference copy (e.g., by fMRI or neurophysiological recordings) would be needed to identify how the CNS implements this comparison.…”

Section: Discussionmentioning

confidence: 99%

Eye Proprioception Used for Visual Localization Only If in Conflict with the Oculomotor Plan

Balslev¹,

Himmelbach²,

Karnath³

et al. 2012

Journal of Neuroscience

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Both the corollary discharge of the oculomotor command and eye muscle proprioception provide eye position information to the brain. Two contradictory models have been suggested about how these two sources contribute to visual localization: (1) only the efference copy is used whereas proprioception is a slow recalibrator of the forward model, and (2) both signals are used together as a weighted average. We had the opportunity to test these hypotheses in a patient (R.W.) with a circumscribed lesion of the right postcentral gyrus that overlapped the human eye proprioceptive representation. R.W. was as accurate and precise as the control group (n ϭ 19) in locating a lit LED that she viewed through the eye contralateral to the lesion. However, when the task was preceded by a brief (Ͻ1 s), gentle push to the closed eye, which perturbed eye position and stimulated eye proprioceptors in the absence of a motor command, R.W.'s accuracy significantly decreased compared with both her own baseline and the healthy control group. The data suggest that in normal conditions, eye proprioception is not used for visual localization. Eye proprioception is, however, continuously monitored to be incorporated into the eye position estimate when a mismatch with the efference copy of the motor command is detected. Our result thus supports the first model and, furthermore, identifies the limits for its operation.

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“…These cells were more abundant in the caudal rhombencephalon. Secondary projections from the trigeminal sensory nucleus have been studied in various vertebrates, showing terminals in the superior colliculus of mammals [Killackey and Erzurumlu, 1981;Ndiaye et al, 2000Ndiaye et al, , 2002, and the OT of reptiles [Auen, 1978;Molenaar and Fizaan-Oostveen, 1978;Welker et al, 1983;Dacey and Ulinski, 1986;Kobayashi et al, 1995], amphibians [Muñoz et al, 1994], actinopterygians [Yamamoto et al, 1999;Xue et al, 2006], chondrichthyans [Smeets, 1982], and hagfish [Amemiya, 1983;Ronan, 1988]. In addition, secondary trigeminal fibers have a similar terminal pattern in the deep tectal layers.…”

Section: Rhombencephalic Projectionsmentioning

confidence: 99%

Afferent Connections of the Optic Tectum in Lampreys: An Experimental Study

Arriba

Pombal²

2006

Brain Behav Evol

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Tectal afferents were studied in adult lampreys of three species (Ichthyomyzon unicuspis, Lampetra fluviatilis, and Petromyzon marinus) following unilateral BDA injections into the optic tectum (OT). In the secondary prosencephalon, neurons projecting to the OT were observed in the pallium, the subhipoccampal lobe, the striatum, the preoptic area and the hypothalamus. Following tectal injections, backfilled diencephalic cells were found bilaterally in: prethalamic eminence, ventral geniculate nucleus, periventricular prethalamic nucleus, periventricular pretectal nucleus, precommissural nucleus, magnocellular and parvocellular nuclei of the posterior commissure and pretectal nucleus; and ipsilaterally in: nucleus of Bellonci, periventricular thalamic nucleus, nucleus of the tuberculum posterior, and the subpretectal tegmentum, as well as in the pineal organ. At midbrain levels, retrogradely labeled cells were seen in the ipsilateral torus semicircularis, the contralateral OT, and bilaterally in the mesencephalic reticular formation and inside the limits of the retinopetal nuclei. In the hindbrain, tectal projecting cells were also bilaterally labeled in the dorsal and lateral isthmic nuclei, the octavolateral area, the sensory nucleus of the descending trigeminal tract, the dorsal column nucleus and the reticular formation. The rostral spinal cord also exhibited a few labeled cells. These results demonstrate a complex pattern of connections in the lamprey OT, most of which have been reported in other vertebrates. Hence, the lamprey OT receives a large number of nonvisual afferents from all major brain areas, and so is involved in information processing from different somatic sensory modalities.

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Connections between the trigeminal mesencephalic nucleus and the superior colliculus in the rat

Cited by 30 publications

References 18 publications

Role of Oculoproprioception in Coding the Locus of Attention

Role of Oculoproprioception in Coding the Locus of Attention

Eye Proprioception Used for Visual Localization Only If in Conflict with the Oculomotor Plan

Afferent Connections of the Optic Tectum in Lampreys: An Experimental Study

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