A STUDY OF EQUILIBRIUM IN THE SMOOTH DOGFISH (<i>GALEUS CANIS</i>MITCHILL) AFTER REMOVAL OF DIFFERENT PARTS OF THE BRAIN

Rizzolo, Attilio

doi:10.2307/1536825

Cited by 12 publications

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“…However, lesion studies and further anatomical evidence have shown that the telencephalon of teleosts is less important for many sensory, motoric and cognitive tasks. Lesion studies have shown that the lesion/ablation of the telencephalon in teleosts has little effect on many behaviors (for a review see Calvo and Schluessel 2021 ), in particular, basic behaviors—such as swimming, feeding, and reproduction—are not affected by lesions at all (Steiner 1888 ; Bethe 1899 ; Rizzolo 1929 ). However, more intricate behaviors such as the reproductive behavior in sticklebacks (Schonherr 1955 ) may be heavily impacted, e.g.…”

Section: Discussionmentioning

confidence: 99%

Brain areas activated during visual learning in the cichlid fish Pseudotropheus zebra

2023

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The neural correlates of most cognitive functions in fish are unknown. This project aimed to identify brain regions involved in visual learning in the cichlid fish Pseudotropheus zebra. The expression of the protein pS6 was measured in 19 brain areas and compared between groups of individuals subjected to four different behavioral contexts (control, avoidance, trained, and novelty groups). Control group individuals were sacrificed with minimal interactions. Fish in the avoidance group were chased with a net for an hour, after which they were sacrificed. Individuals in the trained group received daily training sessions to associate a visual object with a food reward. They were sacrificed the day they reached learning criterion. Fish in the novelty group were habituated to one set of visual stimuli, then faced a change in stimulus type (novelty stimulus) before they were sacrificed. Fish in the three treatment groups showed the largest activation of pS6 in the inferior lobes and the tectum opticum compared to the control group. The avoidance group showed additional activation in the preoptic area, several telencephalic regions, the torus semicircularis, and the reticular formation. The trained group that received a food reward, showed additional activation of the torus lateralis, a tertiary gustatory center. The only area that showed strong activation in all three treatment groups was the nucleus diffusus situated within the inferior lobe. The inferior lobe receives prominent visual input from the tectum via the nucleus glomerulosus but so far, nothing is known about the functional details of this pathway. Our study showed for the first time that the inferior lobes play an important role in visual learning and object recognition.

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Section: Discussionmentioning

confidence: 99%

Brain areas activated during visual learning in the cichlid fish Pseudotropheus zebra

2023

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Studies on cerebellar function in the teleost. I. Reactions resulting from cerebellar ablation

Tuge¹

1934

J of Comparative Neurology

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IS T KO1)CCTTOSAlt.houg1i the problem of ocrdiallar f iinct ion in thc lowcr vertebrates has heen attacked by invcst.igations from vtirious angles, still its exact midcrst anding remains 1.0 R large degree nnsolvetl. Ncvcrt helcss, IICW rind suggcst.ivc data h a w reccntly bccn added to oiir knowledgo of' this problem. 111 my earlier work ('21)) on Uie brain of the tclcost, with which the prcscrit cxpcrimcnt detils, 1: foniid t.hc somatic motor system in the bnlbnr region to be intimately connected with t.he direct. oercbclltir fibers, suggesting the power of the cerebcllum to give strong offorcnt impulses dircctly t.o the motor system (unpublished data). Analysis of the somatic motor mechanism iii the turtlc bruiii has presented further evidence of the intimate relat.ionships between t.he cerebellum and the motor syst.cm, constitding an apparatus of coorclimtion (Tuge, '32). hi connoct.ion with this Pact, it seemed proba.ble to me that most of the latter syst.cm ptirticipates in tho functt.ioning of the bodily musculature as u whole.Starting from this conception, it scems apparent that the cerebellar afferent and the fiomat.ic motor systems as well as '1 am indebted to Dr. A. R. Yooro for reading and criticizing thc manuscript. 201

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Visual discrimination following partial telencephalic ablations in nurse sharks (Ginglymostoma cirratum)

Graeber

Schroeder

Jane

et al. 1978

J of Comparative Neurology

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An instrumental conditioning task was used to examine the role of the nurse shark telencephalon in black-white (BW) and horizontal-vertical stripes (HV) discrimination performance. In the first experiment, subjects initially received either bilateral anterior telencephalic control lesions or bilateral posterior telencephalic lesions aimed at destroying the central telencephalic nuclei (CN), which are known to receive direct input from the thalamic visual area. Postoperatively, the sharks were trained first on BW and then on HV. Those with anterior lesions learned both tasks as rapidly as unoperated subjects. Those with posterior lesions exhibited visual discrimination deficits related to the amount of damage to the CN and its connecting pathways. Severe damage resulted in an inability to learn either task but caused no impairments in motivation or general learning ability. In the second experiment, the sharks were first trained on BW and HV and then operated. Suction ablations were used to remove various portions of the CN. Sharks with 10% or less damage to the CN retained the preoperatively acquired discriminations almost perfectly. Those with 11-50% damage had to be retrained on both tasks. Almost total removal of the CN produced behavioral indications of blindness along with an inability to perform above the chance level on BW despite excellent retention of both discriminations over a 28-day period before surgery. It appears, however, that such sharks can still detect light. These results implicate the central telencephalic nuclei in the control of visually guided behavior in sharks.

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A STUDY OF EQUILIBRIUM IN THE SMOOTH DOGFISH (GALEUS CANISMITCHILL) AFTER REMOVAL OF DIFFERENT PARTS OF THE BRAIN

Cited by 12 publications

References 1 publication

Brain areas activated during visual learning in the cichlid fish Pseudotropheus zebra

Brain areas activated during visual learning in the cichlid fish Pseudotropheus zebra

Studies on cerebellar function in the teleost. I. Reactions resulting from cerebellar ablation

Visual discrimination following partial telencephalic ablations in nurse sharks (Ginglymostoma cirratum)

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