Tamaño relativo encefálico e índices cerebrales en Vanellus c. chilensis (Aves: Charadriidae)

Pistone, Estela; Carezzano, Fernando; Bee-De-Speroni, Noemí

doi:10.4067/s0716-078x2002000300010

Cited by 5 publications

(6 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Some studies provide specific details as to how regions are delineated [e.g., Rehkämper et al, 1991;Boire and Baron, 1994;Timmermans et al, 2000;Lefebvre et al, 2002], but others provide little or no information [e.g., Reboreda et al, 1996;Fernandez et al, 1997;Abbott et al, 1999;Pistone et al, 2002]. Because of this uncertainty, the analyses of data derived from several sources can be affected by different definitions of brain region borders among studies and could have contributed to the variability in the present study.…”

Section: Discussionmentioning

confidence: 58%

“…This included data for 4 more psittaciforms [Boire and Baron, 1994;Fernandez et al, 1997; Ebinger andLöhmer, 1984, 1987;Sherry et al, 1989;Rehkämper et al, 1991;Krebs, 1992, 1996;DeVoogd et al, 1993;Boire and Baron, 1994;Ebinger, 1995;Ebinger and Röhrs, 1995;Basil et al, 1996;Reboreda et al, 1996;Szekely et al, 1996;Abbott et al, 1999;Hauber et al, 1999;Pistone et al, 2002;Pravosudov et al, 2002;see table 3]. Lastly, data for primate telencephalic volumes were taken from Stephan et al [1981].…”

Section: Brain Regionsmentioning

confidence: 99%

See 1 more Smart Citation

Interspecific Allometry of the Brain and Brain Regions in Parrots (Psittaciformes): Comparisons with Other Birds and Primates

Iwaniuk¹,

Dean²,

Nelson³

2004

Brain Behav Evol

159

149

View full text Add to dashboard Cite

Despite significant progress in understanding the evolution of the mammalian brain, relatively little is known of the patterns of evolutionary change in the avian brain. In particular, statements regarding which avian taxa have relatively larger brains and brain regions are based on small sample sizes and statistical analyses are generally lacking. We tested whether psittaciforms (parrots, cockatoos and lorikeets) have larger brains and forebrains than other birds using both conventional and phylogenetically based methods. In addition, we compared the psittaciforms to primates to determine if cognitive similarities between the two groups were reflected by similarities in brain and telencephalic volumes. Overall, psittaciforms have relatively larger brains and telencephala than most other non-passerine orders. No significant difference in relative brain or telencephalic volume was detected between psittaciforms and passerines. Comparisons of other brain region sizes between psittaciforms and other birds, however, exhibited conflicting results depending upon whether body mass or a brain volume remainder (total brain volume – brain region volume) was used as a scaling variable. When compared to primates, psittaciforms possessed similar relative brain and telencephalic volumes. The only exception to this was that in some analyses psittaciforms had significantly larger telencephala than primates of similar brain volume. The results therefore provide empirical evidence for previous claims that psittaciforms possess relatively large brains and telencephala. Despite the variability in the results, it is clear that psittaciforms tend to possess large brains and telencephala relative to non-passerines and are similar to primates in this regard. Although it could be suggested that this reflects the advanced cognitive abilities of psittaciforms, similar studies performed in corvids and other avian taxa will be required before this claim can be made with any certainty.

show abstract

Section: Discussionmentioning

confidence: 58%

Section: Brain Regionsmentioning

confidence: 99%

Interspecific Allometry of the Brain and Brain Regions in Parrots (Psittaciformes): Comparisons with Other Birds and Primates

Iwaniuk¹,

Dean²,

Nelson³

2004

Brain Behav Evol

159

149

View full text Add to dashboard Cite

show abstract

“…Similarly, sample sizes and brain region volumes differ for some species in this study compared to previous studies [Iwaniuk and Hurd, 2005;Iwaniuk et al, , 2008Iwaniuk andWylie, 2006, 2007] because we selected those individuals from which we could reliably measure as many of the three brain regions as possible. In addition to our own data, we gleaned brain region volumes from the literature for an additional 41 species [Ebinger and Löh-mer, 1987;Boire, 1989;Rehkamper et al, 1991;Alma and Bee de Speroni, 1992;Bee de Speroni and Carezzano, 1995;Carezzano and Bee de Speroni, 1995;Ebinger, 1995;Ebinger and Röhrs, 1995;Fernandez et al, 1997;Pistone et al, 2002]. In all cases, similar borders were used to define each of the three regions.…”

Section: Measurementsmentioning

confidence: 99%

Allometric Scaling of the Tectofugal Pathway in Birds

et al. 2010

View full text Add to dashboard Cite

Recent studies have shown that the relative sizes of visual regions in the avian brain are correlated with behavioral differences among species. Despite the fact that the tectofugal pathway is the primary source of visual input to the avian brain, detailed interspecific comparisons of the relative size of nuclei within the pathway, the optic tectum, nucleus rotundus and entopallium, are wanting. Here, we examine the allometric scaling relationships of each of these brain regions relative to the brain as a whole using conventional and phylogenetically based statistics across 113 species. Our results show that the relative size of tectofugal regions of the avian brain varies significantly among avian orders. More specifically, waterfowl (Anseriformes), parrots (Psittaciformes) and owls (Strigiformes) have significantly smaller tectofugal brain regions than other birds. At the opposite end of the spectrum, we found little evidence for the significant enlargement of any tectofugal region among the orders that we sampled. The lack of such hypertrophy likely reflects the heterogeneous organization of the optic tectum, nucleus rotundus and entopallium. We therefore speculate that if neural adaptations do exist in the avian tectofugal pathway that are correlated with behavior, they occur at a more refined level than simple volumetrics.

show abstract

“…Additional data for 31 specimens was obtained from several sources [ table 1 ; Boire, 1989;Carezzano and Bee-de-Speroni, 1995;Pistone et al, 2002]. This included 27 additional species.…”

Section: Specimensmentioning

confidence: 99%

The Independent Evolution of the Enlargement of the Principal Sensory Nucleus of the Trigeminal Nerve in Three Different Groups of Birds

Gutiérrez-Ibáñez

Iwaniuk

Wylie³

2009

Brain Behav Evol

View full text Add to dashboard Cite

In vertebrates, sensory specializations are usually correlated with increases in the brain areas associated with that specialization. This correlation is called the ‘principle of proper mass’ whereby the size of a neural structure is a reflection of the complexity of the behavior that it subserves. In recent years, several comparative studies have revealed examples of this principle in the visual and auditory system of birds, but somatosensory specializations have largely been ignored. Many species rely heavily on tactile information during feeding. Input from the beak, tongue and face, conveyed via the trigeminal, facial, glossopharyngeal and hypoglossal nerves, is first processed in the brain by the principal sensory nucleus of the trigeminal nerve (PrV) in the brainstem. Previous studies report that PrV is enlarged in some species that rely heavily on tactile input when feeding, but no extensive comparative studies have been performed. In this study, we assessed the volume of PrV in 73 species of birds to present a detailed analysis of the relative size variation of PrV using both conventional and phylogenetically based statistics. Overall, our results indicate that three distinct groups of birds have a hypertrophied PrV: waterfowl (Anseriformes), beak-probing shorebirds (Charadriiformes), and parrots (Psittaciformes). These three groups have different sensory requirements from the orofacial region. For example, beak-probing shorebirds use pressure information from the tip of the beak to find buried prey in soft substrates, whereas waterfowl, especially filter-feeding ducks, use information from the beak, palate, and tongue when feeding. Parrots likely require increased sensitivity in the tongue to manipulate food items. Thus, despite all sharing an enlarged PrV and feeding behaviors dependent on tactile input, each group has different requirements that have led to the independent evolution of a large PrV.

show abstract

Tamaño relativo encefálico e índices cerebrales en Vanellus c. chilensis (Aves: Charadriidae)

Cited by 5 publications

References 18 publications

Interspecific Allometry of the Brain and Brain Regions in Parrots (Psittaciformes): Comparisons with Other Birds and Primates

Interspecific Allometry of the Brain and Brain Regions in Parrots (Psittaciformes): Comparisons with Other Birds and Primates

Allometric Scaling of the Tectofugal Pathway in Birds

The Independent Evolution of the Enlargement of the Principal Sensory Nucleus of the Trigeminal Nerve in Three Different Groups of Birds

Contact Info

Product

Resources

About