The topographical projection of the nucleus isthmi pars parvocellularis (Ipc) onto the tectum opticum in the pigeon

Güntürkün, Onur; Remy, Monika

doi:10.1016/0304-3940(90)90337-9

Cited by 55 publications

(26 citation statements)

References 10 publications

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“…This concentration results from successful markings of all recording sites in the ventral tectum, and thus is not a sampling bias. It is interesting to note that though the Ipc projects onto the ventral tectum [Gün-türkün and Remy, 1990], it projects mainly upon the superficial sublayers IIb and IId but not IIc [Hunt et al, 1977]. This might be one of the reasons why ventral cells in this sublayer only have an ERF without an inhibitory surround.…”

Section: Discussionmentioning

confidence: 99%

Regional Variation in Receptive Field Properties of Tectal Neurons in Pigeons

Gu¹,

Wang²,

Wang³

2000

Brain Behav Evol

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The present study provides the first electrophysiological evidence for dorsoventral variation in the receptive field properties of tectal cells in pigeons. According to their receptive field organization, visual response properties and laminar locations, 95 tectal neurons recorded in the present study could be categorized into two groups: (1) Fifty-five DL-neurons were recorded in the dorsal, dorso-lateral, lateral and ventro-lateral tectum and characterized by an excitatory receptive field surrounded by an inhibitory receptive field. Most of them almost equally responded to white and black objects, but did not respond to switch-on and -off of a light spot. (2) Forty VC-neurons were recorded in the ventral tectum and characterized by an excitatory receptive field alone. Their responses to switch-on of a light spot and to a white object were significantly stronger than those to light-off and to a black object, respectively. DL-neurons preferred higher velocity, whereas VC-neurons preferred lower velocity. The recording sites of 53 of 95 cells (56%) examined were marked with pontamine sky blue, showing that DL-neurons were located in tectal layers I–IV, predominantly in layer II, whereas VC-neurons were mainly concentrated in sublayer IIc. The receptive fields of VC-neurons were located within the rostroventral visual field possibly corresponding to the red field of the pigeon retina, suggesting that they might be associated with visual food-foraging behaviors.

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Section: Discussionmentioning

confidence: 99%

Regional Variation in Receptive Field Properties of Tectal Neurons in Pigeons

Gu¹,

Wang²,

Wang³

2000

Brain Behav Evol

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“…Primary sensory forebrain areas included in our analysis were the ectostriatum of the visual tectofugal, 7 the hyperstriatum dorsale pars lateralis of the visual thalamofugal, 44 field L2 of the auditory, 13 and nucleus basalis of the trigeminal system. 78 The intercalated nucleus of the hyperstriatum accessorium, a further termination area of the visual thalamofugal pathway, 33 was not included in the analysis since percentage estimates of labelled neurons could not be obtained reliably in this extremely thin structure. The secondary sensory forebrain areas included in our analysis were the ectostriatal belt, which receives afferents from the ectostriatal core, 73 the hyperstriatum accessorium as the projection zone of the lateral hyperstriatum dorsalis, 84 field L1, which receives afferents Fig.…”

Section: Distribution Of Darpp-32mentioning

confidence: 99%

The dopaminergic innervation of the pigeon telencephalon: distribution of DARPP-32 and co-occurrence with glutamate decarboxylase and tyrosine hydroxylase

et al. 1998

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Abstract--Dopaminergic axons arising from midbrain nuclei innervate the mammalian and avian telencephalon with heterogeneous regional and laminar distributions. In primate, rodent, and avian species, the neuromodulator dopamine is low or almost absent in most primary sensory areas and is most abundant in the striatal parts of the basal ganglia. Furthermore, dopaminergic fibres are present in most limbic and associative structures.Herein, the distribution of DARPP-32, a phosphoprotein related to the dopamine D1-receptor, was investigated in the pigeon telencephalon by immunocytochemical techniques. Furthermore, co-occurrence of DARPP-32-positive perikarya with tyrosine hydroxylase-positive pericellular axonal ''baskets'' or glutamate decarboxylase-positive neurons, as well as co-occurrence of tyrosine hydroxylase and glutamate decarboxylase were examined. Specificity of the anti-DARPP-32 monoclonal antibody in pigeon brain was determined by immunoblotting. The distribution of DARPP-32 shared important features with the distribution of D1-receptors and dopaminergic fibres in the pigeon telencephalon as described previously. In particular, DARPP-32 was highly abundant in the avian basal ganglia, where a high percentage of neurons were labelled in the ''striatal'' parts (paleostriatum augmentatum, lobus parolfactorius), while only neuropil staining was observed in the ''pallidal'' portions (paleostriatum primitivum). In contrast, DARPP-32 was almost absent or present in comparatively lower concentrations in most primary sensory areas. Secondary sensory and tertiary areas of the neostriatum contained numbers of labelled neurons comparable to that of the basal ganglia and intermediate levels of neuropil staining. Approximately up to one-third of DARPP-32-positive neurons received a basket-type innervation from tyrosine hydroxylasepositive fibres in the lateral and caudal neostriatum, but only about half as many did in the medial and frontal neostriatum, and even less so in the hyperstriatum. No case of colocalization of glutamate decarboxylase and DARPP-32 and no co-occurrence of glutamate decarboxylase-positive neurons and tyrosine hydroxylase-basket-like structures could be detected out of more than 2000 glutamate decarboxylase-positive neurons examined, although the high DARPP-32 and high tyrosine hydroxylase staining density hampered this analysis in the basal ganglia.In conclusion, the pigeon dopaminergic system seems to be organized similar to that of mammals. Apparently, in the telencephalon, dopamine has its primary function in higher level sensory, associative and motor processes, since primary areas showed only weak or no anatomical cues of dopaminergic modulation. Dopamine might exert its effects primarily by modulating the physiological properties of non-GABAergic and therefore presumably excitatory units. 1998 IBRO. Published by Elsevier Science Ltd.Key words: DARPP-32, dopamine, D1 receptor, glutamate decarboxylase, tyrosine hydroxylase, pigeon, immunocytochemistry.The mesotelencephalic dopaminergic syst...

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“…The optic tectum is reciprocally connected with three nuclei in the isthmic complex, the nucleus isthmi pars magnocellularis (Imc), pars parvocellularis (Ipc), and pars semilunaris (SLu), each of which receives a prominent visual projection from neurons in tectal layer ten (Hunt et al, 1977;Güntürkün and Remy, 1990;Wang et al, 2004;Wang et al, 2006). Imc neurons have large GABAergic terminal fields providing wide-field inhibition throughout Ipc, SLu, and the deep layers of TeO (Wang et al, 2004;Marín et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Attentional Capture? Synchronized Feedback Signals from the Isthmi Boost Retinal Signals to Higher Visual Areas

Marı́n

Durán²,

Morales³

et al. 2012

J. Neurosci.

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When a salient object in the visual field captures attention, the neural representation of that object is enhanced at the expense of competing stimuli. How neural activity evoked by a salient stimulus evolves to take precedence over the neural activity evoked by other stimuli is a matter of intensive investigation. Here, we describe in pigeons (Columba livia) how retinal inputs to the optic tectum (TeO, superior colliculus in mammals), triggered by moving stimuli, are selectively relayed on to the rotundus (Rt, caudal pulvinar) in the thalamus, and to its pallial target, the entopallium (E, extrastriate cortex). We show that two satellite nuclei of the TeO, the nucleus isthmi parvocelullaris (Ipc) and isthmi semilunaris (SLu), send synchronized feedback signals across tectal layers. Preventing the feedback from Ipc but not from SLu to a tectal location suppresses visual responses to moving stimuli from the corresponding region of visual space in all Rt subdivisions. In addition, the bursting feedback from the Ipc imprints a bursting rhythm on the visual signals, such that the visual responses of the Rt and the E acquire a bursting modulation significantly synchronized to the feedback from Ipc. As the Ipc feedback signals are selected by competitive interactions, the visual responses within the receptive fields in the Rt tend to synchronize with the tectal location receiving the "winning" feedback from Ipc. We propose that this selective transmission of afferent activity combined with the cross-regional synchronization of the areas involved represents a bottom-up mechanism by which salient stimuli capture attention.

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The topographical projection of the nucleus isthmi pars parvocellularis (Ipc) onto the tectum opticum in the pigeon

Cited by 55 publications

References 10 publications

Regional Variation in Receptive Field Properties of Tectal Neurons in Pigeons

Regional Variation in Receptive Field Properties of Tectal Neurons in Pigeons

The dopaminergic innervation of the pigeon telencephalon: distribution of DARPP-32 and co-occurrence with glutamate decarboxylase and tyrosine hydroxylase

Attentional Capture? Synchronized Feedback Signals from the Isthmi Boost Retinal Signals to Higher Visual Areas

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