Brightness discrimination following forebrain ablation in fish

The effect of forebrain ablation on brightness discrimination in goldfish has been studied. Cardiac deceleration, a conditioned autonomic response, was used as the measure of discrimination in a series of goldfish. Normal and forebrainablated fish were trained to discriminate between two gray stimuli of different brightness. If the experimental animal made this brightness discrimination in thirty-five trials it was subsequently tested on a black and white stimulus pair to see whether the fish was capable of stimulus generalization. If the fish did not make the brightness discrimination, it was trained to discriminate a different set of stimuli to show that it was conditionable. It was found that forebrain ablation did not result in any loss in the ability of these operated fish to make a brightness discrimination. In fact, the operated animals learned the brightness discrimination more rapidly than normal animals. Furthermore, the forebrainless fish were able to generalize to another brightness problem. Control tests were run to substantiate this finding.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/32380/1/0000455.pd

Differentiation of the bulbar motor nuclei and the coincident development of associated root fibers in the rabbit

No Abstract.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/49922/1/900720104_ftp.pd

The hypoglossal complex of vertebrates

No Abstract.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/49924/1/900720304_ftp.pd

Studies on the diencephalon of the cat. I. The cyto-architecture of the corpus geniculatum laterale

No Abstract.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/49898/1/900460106_ftp.pd

The dorsal longitudinal fasciculus in Didelphis virginiana

No Abstract.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/49928/1/900760205_ftp.pd

Certain olfactory centers of the forebrain of the giant panda (Ailuropoda melanoleuca)

No Abstract.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/49948/1/900900205_ftp.pd

An experimental study of pathways from the basal ganglia

No Abstract.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/49964/1/901020102_ftp.pd

An anatomical and experimental study of temporal and occipital association areas

No Abstract.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/49951/1/900950306_ftp.pd

Studies on the Diencephalon of the virginia Opossum. Part i. The nuclear pattern in the adult

No Abstract.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/49920/1/900710203_ftp.pd

Retinofugal pathways in the longnose gar Lepisosteus osseus (linnaeus)

Retinal projections were studied with autoradiographic and silver methods in the gar, Lepisosteus osseus , one of the two surviving members of the holostean actinopterygians. Contralaterally, the retina projects to the preoptic nucleus of the hypothalamus, and, via the medial optic tract, to the dorsal thalamus, medial ventral thalamic nucleus, nucleus pretectalis profundus pars ventralis and pars dorsalis, and the medial portion of the deep layer of the central zone in the optic tectum. The dorsal optic tract projects to the lateral ventral thalamic nucleus, nucleus pretectalis centralis, and the superficial white and gray zone of the optic tectum. The ventral optic tract terminates in the nucleus of the ventral optic tract, the lateral and medial ventral thalamic nuclei, nucleus pretectalis superficialis, nucleus pretectalis centralis, nucleus pretectalis profundus pars ventralis, the basal optic nucleus, and the superficial white and gray zone of the optic tectum. Ipsilateral projections are to similar sites, except for an absence of inputs to the lateral ventral thalamic nucleus from the dorsal tract and to the nucleus pretectalis superficialis, nucleus pretectalis profundus pars ventralis, and the basal optic nucleus from the ventral tract. The presence of ipsilateral retinal projections in gars is compared to their presumed absence in teleosts, and comparisons of retino-recipient targets in gars are made with teleosts and with non-actinopterygian vertebrates.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/49996/1/901660102_ftp.pd