Development of neurons in the ectostriatum of normal and monocularly deprived zebra finches: A quantitative Golgi study

Herrmann, Klaus; Bischof, Hans‐Joachim

doi:10.1002/cne.902770110

Cited by 11 publications

(6 citation statements)

References 91 publications

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“…Thus, the effects of monocular deprivation are not confined to the deprived brain side but affect both hemispheres. Such a bilateral deprivation effect has also been shown in zebra finches in which closure of one eye changes tectofugal cell sizes in both brain halves [14,15]. Besides, these results demonstrate that the TTX treatment did not perturb mechanisms of visual discrimination which might have been responsible for asymmetric performances.…”

Section: Discussionsupporting

confidence: 51%

“…Right eye deprivation leads to a reversal of the functional and morphological asymmetry pattern, while left-eye deprivation increases right-eye superiority [7,13]. Since it is known that monocular deprivation affects neuronal cell size in the tectofugal pathway [7,[13][14][15] and since anatomical asymmetries are present within this system, the unbalanced visual stimulation can directly influence the differentiation of the tectofugal pathway. The development of this pathway is well known to be controlled by afferent activity [16] and neurotrophic factors are key mediators of this regulation [17].…”

Section: Introductionmentioning

confidence: 98%

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Post-hatch activity-dependent modulation of visual asymmetry formation in pigeons

et al. 2004

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The embryonically induced visual lateralization in pigeons can be modified by occlusion of one eye after hatching. Here we show that this deprivation effect could be also attained by short-term blocking of retinal activity with tetrodotoxin (TTX), leading to a dominance of the ipsilateral hemisphere in a visual discrimination task. This lateralization pattern resulted from a performance increase conveyed by the non-deprived hemisphere, while performance with the TTX-injected eye did not differ from that of saline-injected controls. Thus, post-hatch modulation of visual lateralization is mediated by TTX-sensitive, activity-dependent neuronal mechanisms. The transient silencing of one visual input alters the activity balance between the left and right eye system, enhancing visuoperceptive skills in the relatively higher active hemisphere.

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Section: Discussionsupporting

confidence: 51%

Section: Introductionmentioning

confidence: 98%

Post-hatch activity-dependent modulation of visual asymmetry formation in pigeons

et al. 2004

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“…One hundred/~m coronal vibratome sections were made after processing the brains according to a modification of the Bubenaite Golgi method [22]. Because MNH and ANC can be defined exactly only in 2-DG images, we used other structures, which could be seen in 2-DG as well as in Golgi preparations, as landmarks.…”

Section: Methodsmentioning

confidence: 99%

“…For the measurements, only those of the terminal sections of a dendrite were selected, which were parallel to the surface of the slide. Terminal sections were chosen because earlier studies have shown that these are most strongly affected by experience [41,22,27,33]. The selected sections (20 for each bird) were marked during drawing and the number of spines/ 10 #m estimated with help of a graphics tablet.…”

Section: Methodsmentioning

confidence: 99%

Phase specific morphological changes induced by social experience in two forebrain areas of the zebra finch

Rollenhagen¹,

Bischof²

1994

Behavioural Brain Research

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We examined the changes of spine density in Golgi preparations of two different areas of the forebrain of the zebra finch, the ANC (Archi-Neostriatum caudale) and MNH (medial Neo-Hyperstriatum) during development, after transferring male birds from isolation to a social condition (exposure to a female for 1 week), and after a second isolation period. MNH and ANC are two of four brain regions which are strongly activated if a male bird is exposed to a female after some time of isolation. The results of our study can be summarized as follows. 1: a peak-decline trend is observed in ANC, but not in MNH. 2: rearing conditions do not affect the development of both areas until day 70. 3: from 80 days of age, isolation leads to reduced spine density within ANC, but to enhanced spine density within MNH. 4: short social contact after isolation diminishes or eliminates the effects of isolation by an enhancement of spine density in ANC and a reduction of spine density within MNH. 5: the effects of short social rearing after isolation are reversible within ANC, but not within MNH. We presume that the alterations of spine density, which are induced by changes in social conditions, are restricted to ages older than 70 days by hormonal factors. We propose that the complexity of the ANC neuronal net follows the complexity of the social environment, and that the level of arousal is the most important factor influencing the complexity. We further suppose that the reduction of spines within MNH is the anatomical manifestation of an imprinting process, which has been shown to occur in the same experimental situation as we used it in our study.

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“…1), the birds were deeply anesthetized and perfused with 0.9% NaC1 followed by 10% formaldehyde. After processing the brains according to a modification of the Bubenaite Golgi method [10], 100-~tm transverse vibratome sections were made. In all brain areas, a neuron type characterized by a soma diameter of about 5-10 ~tm and 4-6 radially ordered dendrites with relatively few dendritic spines could be identified.…”

Section: Golgi Experimentsmentioning

confidence: 99%

Activity-dependent plasticity in visual forebrain areas of the zebra finch

Rollenhagen

Bischof

1996

Behavioural Brain Research

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It has previously been shown that the activity of some areas of the forebrain of birds is dependent on the arousal level of the animal. Other areas do not show this dependency. This paper, on the basis of 2-DG experiments and spine density measurements on Golgi-impregnated tissue, shows that primary telencephalic target areas of the two visual pathways of zebra finch males are not dependent on arousal for activation. In contrast, secondary areas of both visual pathways show arousal-dependent activation. Only the secondary visual areas also show effects of rearing conditions on the spine density: isolation of the birds from day 40 reduces spine density in the hyperstriatum accessorium (HA) of the thalamofugal pathway, and enhances spine density in the lateral neo/hyperstriatum (LNH, tectofugal pathway) significantly from day 80, if compared to aviary-reared birds. A 1-week exposure to a female eliminates the isolation effects in both areas. A second isolation period again reduces the spine density in the HA, but does not enhance it again in the LNH. By comparison with previous studies, we conclude that the spine density in the HA reflects the complexity of the social environment. The irreversible reduction of spine density in the LNH as consequence of the 7-day exposure to a female is interpreted as physiological correlate of an imprinting process, which has previously been shown to occur at the same time. The effects in both areas, the HA and LNH, are dependent on arousal, which may be mediated by brainstem efferents innervating the secondary, but not the primary, visual areas in birds and in mammals.

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Development of neurons in the ectostriatum of normal and monocularly deprived zebra finches: A quantitative Golgi study

Cited by 11 publications

References 91 publications

Post-hatch activity-dependent modulation of visual asymmetry formation in pigeons

Post-hatch activity-dependent modulation of visual asymmetry formation in pigeons

Phase specific morphological changes induced by social experience in two forebrain areas of the zebra finch

Activity-dependent plasticity in visual forebrain areas of the zebra finch

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