Abstract
Tarsiers form the sister taxon to anthropoid primates, and their brains possess a mix of primitive and specialized features. We describe architectonically distinct subdivisions of the somatosensory, auditory, and visual systems for tarsiers, as well as nocturnal New World owl monkeys (Aotus) and strepsirhine galagos (Otolemur) for comparison. In general, the dorsal column nuclei, the ventroposterior nucleus, and primary somatosensory cortex are somewhat less distinctly differentiated in tarsiers, suggesting that the somatosensory system is less specialized for somatosensory processing. Although the inferior colliculus and the medial geniculate complex of the auditory system are architectonically similar across the 3 primates, the primary auditory cortex of tarsiers is more distinct, suggesting a greater role in auditory cortical processing. In the visual system, the differentiation of the superior colliculus is similar in all 3 primates, whereas the laminar pattern in the lateral geniculate nucleus and the subdivisions of the inferior pulvinar in tarsiers resemble those of anthropoid primates rather than strepsirhines, in agreement with the evidence that tarsiers form the sister clade for anthropoids. In addition, primary visual cortex has more distinct sublayers in tarsiers than other primates, attesting to its importance in this visual predator. Overall, tarsiers have well developed visual and auditory systems, and a less well developed somatosensory system, suggesting an enhanced reliance on the visual and auditory senses, rather than somatosensory sense.
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Acknowledgments
We thank Dr. Anita Hendrickson for providing 3 adult brains of Tarsius spectrum for histological study. The fourth brain was from the histological collection of Dr. J. M. Petras. We thank the reviewers for helpful comments on the manuscript. Funds to support this research were from Vanderbilt University to J. H. Kaas and a grant from the National Eye Institute, EY 02686 to J. H. Kaas.
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Abbreviations
A1 | Primary auditory area |
CB | Calbindin |
CN | Cuneate nucleus |
CO | Cytochrome oxidase |
GN | Gracile nucleus |
IC | Inferior colliculus |
K | Koniocellular |
LGN | Lateral geniculate nucleus |
M | Magnocellular |
MGC | Medial geniculate complex |
MGd | Medial geniculate dorsal nucleus |
MGm | Medial geniculate magnocellular nucleus |
MGv | Medial geniculate ventral nucleus |
MT | Middle temporal visual area |
P | Parvocellular |
PI | Inferior pulvinar |
PIcl | Inferior pulvinar central lateral subdivision |
PIcm | Inferior pulvinar central medal subdivision |
PIm | Inferior pulvinar medial subdivision |
PIp | Inferior pulvinar posterior subdivision |
Pv | Parietal ventral area |
PV | Parvalbumin |
R | Rostral auditory area |
S1 | Primary somatosensory cortex (Area 3b) |
S2 | Secondary somatosensory cortex |
SC | Superior colliculus |
SG | Suprageniculate nucleus |
TBS | Tris buffered saline |
V1 | Primary visual area |
V2 | Secondary visual area |
VP | Ventroposterior nucleus |
VPI | Ventroposterior inferior nucleus |
VPL | Ventroposterior lateral nucleus |
VPM | Ventroposterior medial nucleus |
VPS | Ventroposterior superior nucleus |
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Wong, P., Collins, C.E. & Kaas, J.H. Overview of Sensory Systems of Tarsius . Int J Primatol 31, 1002–1031 (2010). https://doi.org/10.1007/s10764-009-9388-4
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DOI: https://doi.org/10.1007/s10764-009-9388-4