Afferent connections of the ectostriatum and visual wulst in the zebra finch (Taeniopygia guttata castanotis Gould) — an HRP study

Nixdorf, Barbara E.; Bischof, Hans‐Joachim

doi:10.1016/0006-8993(82)91142-8

Cited by 93 publications

(79 citation statements)

References 19 publications

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“…Within the ectostriatal core, no subdivision or lamination can be detected anatomically. However, several studies (Cohen and Karten 1974;Nixdorf and Bischof 1982) have demonstrated that the nucleus rotundus projects topographically into the ectostriatum, suggesting that there is at least a certain degree of topographical order in this area. From the distribution of macroscopic sinks and sources demonstrated above, it is likely that the ectostriatum is ordered functionally.…”

Section: Discussionmentioning

confidence: 99%

Flash evoked potentials in the ectostriatum of the zebra finch: a current source-density analysis

Engelage

Bischof

1989

Exp Brain Res

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Summary.Recent research has demonstrated that ipsilaterally visually evoked potentials (VEPs) can be measured within the ectostriatum, the telencephalic target area of the tectofugal visual pathway in birds. In this paper we systematically measured contra-and ipsilateral VEPs within the ectostriatal complex to obtain more detailed information on the processing of contra-and ipsilateral stimuli. The similarity of neighbouring VEPs at equal depth and a comparison of a one dimensional and a three dimensional analysis of current source-densities (CSDs) for identical coordinates suggested that a one dimensional current source-density analysis might be applicable. The one dimensional current source-density analysis demonstrated largely corresponding patterns in the sinksource sequences of the current source-density depth profiles for the contra-and ipsilateral stimulus responses. The occurrence of a large sink in the centre of the ectostriatal core, together with the results of multiunit recordings, shows that the ectostriatal core is the location of the generators for both the contra-and the ipsilaterally evoked responses. The occurrence of macroscopic sinks and sources and the fact that VEPs can be recorded from the ectostriatum shows that there is a higher degree of order in the ectostriatum than has been previously demonstrated by anatomical methods. The time coincidence between the maximum spike rate of multiunit responses, the negative peak of the evoked potential, and the large central sink demonstrates that the influence of ipsi-as well as of contralateral stimuli is predominantly excitatory.

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Section: Discussionmentioning

confidence: 99%

Flash evoked potentials in the ectostriatum of the zebra finch: a current source-density analysis

Engelage

Bischof

1989

Exp Brain Res

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“…As a consequence of the presence of subfields, the term Field L has come to have two different uses in the literature, one in which it refers to L2 alone and one in which it refers to L1-3. Similar problems arise with respect to the ectostriatum, because in some studies the core and shell are together referred to as the ectostriatum, whereas in others only the thalamorecipient core is called the ectostriatum (Karten and Revzin, 1966;Karten and Hodos, 1970;Benowitz and Karten, 1976;Nixdorf and Bischof, 1982;Husband and Shimizu, 1999). Because the structure that has been known as the nucleus basalis also shows a core and shell organization, a similar problem exists for it ( Fig.…”

Section: Rationale For Individual Changes: the Neostriatummentioning

confidence: 98%

“…The fiber-rich zone interposed between the entopallium and the lateral striatum primarily contains axons that had coursed from the nucleus rotundus of the thalamus to the telencephalon via the lateral forebrain bundle (or fasciculus prosencephali lateralis), in their passage to their termination in the structure that we recommend now be called the entopallium (Karten and Hodos, 1970;Nixdorf and Bischof, 1982). This fiber-rich zone has been termed the tractus thalamostriaticus (TTS).…”

Section: Lamina Frontalis Superior (Lfs) 3 Lamina Frontalis Superior mentioning

confidence: 99%

Revised nomenclature for avian telencephalon and some related brainstem nuclei

Reiner

Perkel

Bruce

et al. 2004

J of Comparative Neurology

1,074

1,170

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The standard nomenclature that has been used for many telencephalic and related brainstem structures in birds is based on flawed assumptions of homology to mammals. In particular, the outdated terminology implies that most of the avian telencephalon is a hypertrophied basal ganglia, when it is now clear that most of the avian telencephalon is neurochemically, hodologically, and functionally comparable to the mammalian neocortex, claustrum, and pallial amygdala (all of which derive from the pallial sector of the developing telencephalon). Recognizing that this promotes misunderstanding of the functional organization of avian brains and their evolutionary relationship to mammalian brains, avian brain specialists began discussions to rectify this problem, culminating in the Avian Brain Nomenclature Forum held at Duke University in July 2002, which approved a new terminology for avian telencephalon and some allied brainstem cell groups. Details of this new terminology are presented here, as is a rationale for each name change and evidence for any homologies implied by the new names.Revisions for the brainstem focused on vocal control, catecholaminergic, cholinergic, and basal ganglia-related nuclei. For example, the Forum recognized that the hypoglossal nucleus had been incorrectly identified as the nucleus intermedius in the Karten and Hodos (1967) pigeon brain atlas, and what was identified as the hypoglossal nucleus in that atlas should instead be called the supraspinal nucleus. The locus ceruleus of this and other avian atlases was noted to consist of a caudal noradrenergic part homologous to the mammalian locus coeruleus and a rostral region corresponding to the mammalian A8 dopaminergic cell group. The midbrain dopaminergic cell group in birds known as the nucleus tegmenti pedunculopontinus pars compacta was recognized as homologous to the mammalian substantia nigra pars compacta and was renamed accordingly; a group of ␥-aminobutyric acid (GABA)ergic neurons at the lateral edge of this region was identified as homologous to the mammalian substantia nigra pars reticulata and was also renamed accordingly. A field of cholinergic neurons in the rostral avian hindbrain was named the nucleus pedunculopontinus tegmenti, whereas the anterior nucleus of the ansa lenticularis in the avian diencephalon was renamed the subthalamic nucleus, both for their evident mammalian homologues.For the basal (i.e., subpallial) telencephalon, the actual parts of the basal ganglia were given names reflecting their now evident homologues. For example, the lobus parolfactorius and paleostriatum augmentatum were acknowledged to make up the dorsal subdivision of the striatal part of the basal ganglia and were renamed as the medial and lateral striatum. The paleostriatum primitivum was recognized as homologous to the mammalian globus pallidus and renamed as such. Additionally, the rostroventral part of what was called the lobus parolfactorius was acknowledged as comparable to the mammalian nucleus accumbens, which, together with the...

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“…The nRT-Ec projection is topographic: the caudal and rostral Ec receive input from subnuclei in the caudal and rostral nRT, respectively (Benowitz and Karten, 1976;Nixdorf and Bischof, 1982). The physiological organization of nRT (see above) (Wang et al, 1993) suggests that the caudal Ec should be important for visual motion processing, whereas the rostral Ec should be important for spatial-pattern vision and color.…”

Section: Introductionmentioning

confidence: 99%

A Dissociation of Motion and Spatial-Pattern Vision in the Avian Telencephalon: Implications for the Evolution of “Visual Streams”

Nguyen¹,

Spetch²,

Crowder³

et al. 2004

J. Neurosci.

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The ectostriatum is a large visual structure in the avian telencephalon. Part of the tectofugal pathway, the ectostriatum receives a large ascending thalamic input from the nucleus rotundus, the homolog of the mammalian pulvinar complex. We investigated the effects of bilateral lesions of the ectostriatum in pigeons on visual motion and spatial-pattern perception tasks. To test motion perception, we measured performance on a task requiring detection of coherently moving random dots embedded in dynamic noise. To test spatialpattern perception, we measured performance on the detection of a square wave grating embedded in static noise. A double dissociation was revealed. Pigeons with lesions to the caudal ectostriatum showed a performance deficit on the motion task but not the grating task. In contrast, pigeons with lesions to the rostral ectostriatum showed a performance deficit on the grating task but not the motion task. Thus, in the avian telencephalon, there is a separation of visual motion and spatial-pattern perception as there is in the mammalian telencephalon. However, this separation of function is in the targets of the tectofugal pathway in pigeons rather than in the thalamofugal pathway as described in mammals. The implications of these findings with respect to the evolution of the visual system are discussed. Specifically, we suggest that the principle of parallel visual streams originated in the tectofugal pathway rather than the thalamofugal pathway.

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Afferent connections of the ectostriatum and visual wulst in the zebra finch (Taeniopygia guttata castanotis Gould) — an HRP study

Cited by 93 publications

References 19 publications

Flash evoked potentials in the ectostriatum of the zebra finch: a current source-density analysis

Flash evoked potentials in the ectostriatum of the zebra finch: a current source-density analysis

Revised nomenclature for avian telencephalon and some related brainstem nuclei

A Dissociation of Motion and Spatial-Pattern Vision in the Avian Telencephalon: Implications for the Evolution of “Visual Streams”

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