Brain Center Correlations among Chiroptera

Jolicœur, Pierre; Baron, Georg

doi:10.1159/000121812

Cited by 16 publications

(10 citation statements)

References 8 publications

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“…Moreover, the picture remains the same even if calculations are restricted to the subsample of 17 species available to Jolicoeur and Baron s [1980] (lower left half of table I). Any suggestion that our present results on major brain regions differ from Jolicoeur and Baron's [1980] results on nu clei and centers merely because we have more data can therefore readily be dismis sed.…”

Section: Resultscontrasting

confidence: 44%

Correlations between Major Brain Regions in Chiroptera

Pirlot¹,

Jolicœur²

1982

Brain Behav Evol

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Unlike small homogeneous nuclei, progression indices of large heterogeneous brain regions show no negative correlations and give no evidence of compensatory effects, presumably because the evolutionary progressions and regressions of multiple neighboring functions mask each other. The diencephalon and various parts of the telencephalon show large positive correlations, apparently reflecting the general increase in size of the brain, relatively to body weight, from presumably primitive to advanced forms. The neocortex is strongly correlated with the striatum, a putative precursor, and with the diencephalon, but less strongly correlated with the cerebellum in Chiroptera than in Primates. The mesencephalon is moderately correlated with the medulla oblongata and cerebellum, but uncorrelated with all parts of the telencephalon except the paleocortex. The bulbus olfactorius is correlated with the septum, schizocortex and hippocampus, but these correlations may be due mostly to the progression of these four structures in Megachiroptera and their regression in insectivorous Microchiroptera, and may not imply major direct functional relationships.

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Section: Resultscontrasting

confidence: 44%

Correlations between Major Brain Regions in Chiroptera

Pirlot¹,

Jolicœur²

1982

Brain Behav Evol

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“…In such cases, they may be the consequence of similar evolutionary trends. The evidence of correlation coefficients was discussed in more detail by Jolicoeur and Baron [1980] and Jolicoeur et al [1984] on the basis of volume measure ments of brain structures in Chiroptera, Insectivora and Primates.…”

Section: Evolutionary Trendsmentioning

confidence: 99%

Volume Comparisons in the Cerebellar Complex of Primates

Matano¹,

Baron²,

Stephan³

et al. 1985

IJFP

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Volumes of medial, interposed, and lateral cerebellar nuclei (MCN, ICN, and LCN) were measured in Insectivora, Scandentia, and Primates, including man. The relative size of the nuclei was expressed in size indices. Insectivora had by far the smallest cerebellar nuclei. The simians, in general, had larger cerebellar nuclei than the prosimians, but there was considerable overlap. From Insectivora to man, the MCN was the least progressive and the LCN the most progressive. The indices are expected to reflect the relative size of the three longitudinal zones of the cerebellum (vermis/MCN, pars intermedius/ICN, hemisphere/ LCN). They, together with those of the ventral pons and cerebellum (part I), are discussed in relation to the predominant locomotor pattern of a species, and with reference to evolutionary trends in primate phylogeny.

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“…Previous studies on brain evolution in primates and other mammals have shown that meaningful results can be obtained by determining RBrS based on a conservative group (e.g., Stephan and Bauchot 1965;Stephan 1966, 1969;Stephan 1967a,b;Pirlot and Stephan 1970;Stephan and Pirlot 1970;Baron 1972Baron , 1977aBaron , b, 1978Baron , 1979Jolicoeur and Baron 1980;Jolicoeur et al 1984). Since it is impossible to obtain precise information on the quantitative composition of brain in fossil mammals, the most conservative forms of extant Insectivora have been used as a reference group ("Basal Insectivora").…”

Section: Indicesmentioning

confidence: 99%

“…Indeed, correlations of size indices may be positive or negative or drop abruptly and reveal evolutionary compensation, regression or progression depending on the taxonomic unit Jolicoeur and Baron 1980;Jolicoeur et al 1984).…”

Section: C) Congeneric Speciesmentioning

confidence: 99%

“…Total brain size alone may not be sufficient since the same size found in different species may be the result of a differential growth of different brain parts, e.g., reduction of olfactory structures and simultaneous neocortical enlargement or compensatory effects in sensory structures (Jolicoeur and Baron 1980). Therefore, whenever possible, brain composition should be investigated.…”

Section: Introductionmentioning

confidence: 99%

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