Consciousness in Jawless Fishes

Suzuki, Daichi G.

doi:10.3389/fnsys.2021.751876

Cited by 7 publications

(6 citation statements)

References 55 publications

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“…3 ; Striedter and Northcutt 2020 ). Most information on brain organization in basal vertebrates is based on the comparative neuroanatomy of jawed fish, and therefore, this paper focuses on this species-rich taxon rather than the two extant groups of highly specialized jawless vertebrates ( Suzuki 2021 ).…”

Section: The Neural Functional Architecture Of the First Jawed Verteb...mentioning

confidence: 99%

The evolutionary origins of the Global Neuronal Workspace in vertebrates

Zacks,

Jablonka

2023

Neuroscience of Consciousness

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The Global Neuronal Workspace theory of consciousness offers an explicit functional architecture that relates consciousness to cognitive abilities such as perception, attention, memory, and evaluation. We show that the functional architecture of the Global Neuronal Workspace, which is based mainly on human studies, corresponds to the cognitive-affective architecture proposed by the Unlimited Associative Learning theory that describes minimal consciousness. However, we suggest that when applied to basal vertebrates, both models require important modifications to accommodate what has been learned about the evolution of the vertebrate brain. Most importantly, comparative studies suggest that in basal vertebrates, the Global Neuronal Workspace is instantiated by the event memory system found in the hippocampal homolog. This proposal has testable predictions and implications for understanding hippocampal and cortical functions, the evolutionary relations between memory and consciousness, and the evolution of unified perception.

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Section: The Neural Functional Architecture Of the First Jawed Verteb...mentioning

confidence: 99%

The evolutionary origins of the Global Neuronal Workspace in vertebrates

Zacks,

Jablonka

2023

Neuroscience of Consciousness

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“…There is little space between the brain and the brain capsule (Figure 7a). The brain consists of the telencephalon, diencephalon, mesencephalon, and rhombencephalon (Figure 7b; also see Dupret et al, 2014;Sugahara et al, 2017;Suzuki, 2021), as in other vertebrates. There is no overt epiphysis.…”

Section: Head and Brainmentioning

confidence: 95%

Gross anatomy of the Pacific hagfish, Eptatretus burgeri, with special reference to the coelomic viscera

Muramatsu

Suzuki

et al. 2023

The Anatomical Record

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Hagfish (Myxinoidea) are a deep‐sea taxon of cyclostomes, the extant jawless vertebrates. Many researchers have examined the anatomy and embryology of hagfish to shed light on the early evolution of vertebrates; however, the diversity within hagfish is often overlooked. Hagfish have three lineages, Myxininae, Eptatretinae, and Rubicundinae. Usually, textbook illustrations of hagfish anatomy reflect the morphology of the Myxininae lineage, especially Myxine glutinosa, with its single pair of external branchial pores. Here, we instead report the gross anatomy of an Eptatretinae, Eptatretus burgeri, which has six pairs of branchial pores, especially focusing on the coelomic organs. Dissections were performed on fixed and unfixed specimens to provide a guide for those doing organ‐ or tissue‐specific molecular experiments. Our dissections revealed that the ventral aorta is Y‐branched in E. burgeri, which differs from the unbranched morphology of Myxine. Otherwise, there were no differences in the morphology of the lingual apparatus or heart in the pharyngeal domain. The thyroid follicles were scattered around the ventral aorta, as has been reported for adult lampreys. The hepatobiliary system more closely resembled those of jawed vertebrates than those of adult lampreys, with the liver having two lobes and a bile duct connecting the gallbladder to each lobe. Overall, the visceral morphology of E. burgeri does not differ significantly from that of the known Myxine at the level of gross anatomy, although the branchial morphology is phylogenetically ancestral compared to Myxine.

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“…The brain consists of the telencephalon, diencephalon, mesencephalon, and rhombencephalon (Fig. 7b; also see Dupret et al, 2014;Sugahara et al, 2017;Suzuki, 2021), as in other vertebrates. There is no overt epiphysis.…”

Section: Head and Brainmentioning

confidence: 97%

Gross anatomy of the Pacific hagfish,Eptatretus burgeri, with special reference to the coelomic viscera

Muramatsu

Suzuki

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

Hagfish (Myxinoidea) are a deep-sea taxon of cyclostomes, the extant jawless vertebrates. Many researchers have examined the anatomy and embryology of hagfish to shed light on the early evolution of vertebrates; however, the diversity within hagfish is often overlooked. Hagfish have two lineages, Myxininae and Eptatretinae. Usually, textbook illustrations of hagfish anatomy reflect the morphology of the former lineage, especially Myxine glutinosa, with its single pair of external branchial pores. Here, we instead report the gross anatomy of an Eptatretinae, Eptatretus burgeri, which has six pairs of branchial pores, especially focusing on the coelomic organs. Dissections were performed on fixed and unfixed specimens to provide a guide for those doing organ- or tissue-specific molecular experiments. Our dissections revealed that the ventral aorta is Y-branched in E. burgeri, which differs from the unbranched morphology of Myxine. Otherwise, there were no differences in the morphology of the lingual apparatus or heart in the pharyngeal domain. The thyroid follicles were scattered around the ventral aorta, as has been reported for adult lampreys. The hepatobiliary system more closely resembled those of jawed vertebrates than those of adult lampreys, with the liver having two lobes and a bile duct connecting the gallbladder to each lobe. Overall, the visceral morphology of E. burgeri does not differ significantly from that of the known Myxine at the level of gross anatomy, except for the number of branchial pores.

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Consciousness in Jawless Fishes

Cited by 7 publications

References 55 publications

The evolutionary origins of the Global Neuronal Workspace in vertebrates

The evolutionary origins of the Global Neuronal Workspace in vertebrates

Gross anatomy of the Pacific hagfish, Eptatretus burgeri, with special reference to the coelomic viscera

Gross anatomy of the Pacific hagfish,Eptatretus burgeri, with special reference to the coelomic viscera

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