Ground Squirrel Brain Research Articles

Variations in (Na + + K +)-ATPase and Mg 2+-ATPase activity of the ground squirrel brain during hibernation

1. 1. The specific activity of brain (Na + + K +)-ATPase and Mg 2+-ATPase of the ground squirrel ( Spermophilus richardsonii) is significantly increased after long-term hibernation. 2. 2. The markedly non-linear thermal dependence of (Na + + K +)-ATPase is unchanged during hibernation whereas the near linear thermal dependence of Mg 2+-ATPase undergoes minor alteration after prolonged hibernation. 3. 3. The sensitivity of (Na + + K +)-ATPase to inhibition by ouabain is significantly decreased after 100 days of hibernation as is both the rate and amount of [ 3H]-ouabain binding. 4. 4. These changes may be related to alteration in the phospholipid matrix of the membrane rather than alteration in the protein structure of the enzyme.

Functional organization of cells in superior colliculus of the ground squirrel.

Functional organization of cells in superior colliculus of the ground squirrel.C R MichaelC R MichaelPublished Online:01 Nov 1972https://doi.org/10.1152/jn.1972.35.6.833MoreSectionsPDF (2 MB)Download PDF ToolsExport citationAdd to favoritesGet permissionsTrack citations ShareShare onFacebookTwitterLinkedInWeChat Previous Back to Top Next Download PDF FiguresReferencesRelatedInformation Cited ByThe effect of dark-rearing, strobe-rearing and acute visual cortex removal on the visual responses in the superficial superior colliculus of the guinea-pigNeuroscience Letters, Vol. 213, No. 3The nature and origin of orientation specificity in neurons of the visual pathwaysProgress in Neurobiology, Vol. 43, No. 4-5Superior colliculus efferents to five subcortical visual system structures in the ground squirrelBrain Research, Vol. 426, No. 1The central visual systemVision Research, Vol. 26, No. 9Efferent systems of primary visual cortex: A review of structure and functionBrain Research Reviews, Vol. 6, No. 1Receptive field properties of single cells in the pigeon's optic tectum during cooling of the ‘visual wulst’Brain Research, Vol. 267, No. 2Organization of somatosensory input to the deep collicular laminae in hamsterBehavioural Brain Research, Vol. 3, No. 2The effect of superior colliculus ablation on saccades elicted by cortical stimulationBrain Research, Vol. 122, No. 1Effects of neonatal cortical lesions upon the cat superior colliculusBrain Research, Vol. 83, No. 3 More from this issue > Volume 35Issue 6November 1972Pages 833-46 https://doi.org/10.1152/jn.1972.35.6.833PubMed4654252History Published online 1 November 1972 Published in print 1 November 1972 Metrics

Visual receptive fields of single neurons in superior colliculus of the ground squirrel.

Visual receptive fields of single neurons in superior colliculus of the ground squirrel.C R MichaelC R MichaelPublished Online:01 Nov 1972https://doi.org/10.1152/jn.1972.35.6.815MoreSectionsPDF (3 MB)Download PDF ToolsExport citationAdd to favoritesGet permissionsTrack citations ShareShare onFacebookTwitterLinkedInEmailWeChat Previous Back to Top Next Download PDF FiguresReferencesRelatedInformationCited ByVisual Function, Organization, and Development of the Mouse Superior ColliculusAnnual Review of Vision Science, Vol. 4, No. 1Weak orientation and direction selectivity in lateral geniculate nucleus representing central vision in the gray squirrel Sciurus carolinensisJulia B. Zaltsman, J. Alexander Heimel, and Stephen D. Van Hooser28 April 2015 | Journal of Neurophysiology, Vol. 113, No. 7Pattern of retinal projections in the California ground squirrel (Spermophilus beecheyi): Anterograde tracing study using cholera toxin16 June 2003 | The Journal of Comparative Neurology, Vol. 463, No. 3The nature and origin of orientation specificity in neurons of the visual pathwaysProgress in Neurobiology, Vol. 43, No. 4-5Photically responsive neurons in the hypothalamus of a diurnal ground squirrelBrain Research, Vol. 501, No. 2Striped pattern of labeling in ground squirrel superior colliculus following intraocular HRP injectionsBrain Research, Vol. 489, No. 1Morphology of ganglion cells which project to the dorsal lateral geniculate and superior colliculus in the ground squirrelBrain Research, Vol. 454, No. 1-2Superior colliculus efferents to five subcortical visual system structures in the ground squirrelBrain Research, Vol. 426, No. 1Intensity coding and luxotonic activity in the ground squirrel lateral geniculate nucleusVision Research, Vol. 27, No. 12The central visual systemVision Research, Vol. 26, No. 9New methods for analysis of vision in the gerbilBehavioural Brain Research, Vol. 3, No. 2Organization of the rodent superior colliculus: Some comparisons with other mammalsBehavioural Brain Research, Vol. 3, No. 2Single-neuron responses to moving sine-wave gratings in the pigeon optic tectumVision Research, Vol. 19, No. 9Properties of cells projecting rostrally from the superficial layers of the cat's superior colliculusBrain Research, Vol. 143, No. 3Retinal ganglion cell activity in the ground squirrel under halothane anesthesiaVision Research, Vol. 18, No. 1Effects of posterior neocortical lesions on wavelength, light/dark and stripe orientation discrimination in ground squirrelsBrain Research, Vol. 122, No. 1Directional selectivity in the superior colliculus of the golden hamsterBrain Research, Vol. 118, No. 2Visual receptive field types in the nucleus dorsalateralis anterior of the pigeon's thalamusBrain Research, Vol. 108, No. 2Effects of neonatal cortical lesions upon the cat superior colliculusBrain Research, Vol. 83, No. 3Opponent-color units in the thalamus of the pigeon (Columba livia)Vision Research, Vol. 13, No. 8 More from this issue > Volume 35Issue 6November 1972Pages 815-32 https://doi.org/10.1152/jn.1972.35.6.815PubMed4569705History Published online 1 November 1972 Published in print 1 November 1972 Metrics

Receptive-field characteristics of superior colliculus neurons in the rabbit.

Receptive-field characteristics of superior colliculus neurons in the rabbit.

Distribution of epinephrine and norepinephrine in the brain of Citellus lateralis during the hibernating cycle

1. The regional concentration of epinephrine and norepinephrine in the brain of golden-mantled ground squirrels ( Citellus lateralis) was measured at different intervals of the hibernating cycle. 2. The concentrations of epinephrine and norepinephrine in the hypothalamus and cerebellum were constant during induction into hibernation, during three segments of the hibernating period, and during the period of activity between hibernation periods. 3. The concentration of epinephrine in the medulla oblongata (with pons) showed no variation related to sampling time; however, the concentration of norepinephrine in this tissue was significantly reduced during the period of activity. 4. The data indicate that progressive irritability during the hibernating period is probably not accounted for by a generalized accumulation of epinephrine in the hypothalamus as was previously proposed.

Visual receptive fields in the superior colliculus of the cat.

Visual receptive fields in the superior colliculus of the cat.

Changes of aspartic acid in various cerebral structures of hibernating and aroused ground squirrels.

AbstractThe concentrations of aspartic acid in various regions of the brain of European ground squirrels (Cilellus citellus), sacrificed at different stages of the hibernating cycle, have been estimated by means of two dimensional paper chromatography. On the basis of experimental results obtained the following conclusions have been derived:1. Similar concentrations of aspartic acid where found in different cortical and subcortical areas of the ground squirrel brain.2. In hibernation at rectal temperatures of 5° C, an important decrease of aspartic acid was found in all the regions studied.3. Inversely, arousal from hibernation was associated with an increase of aspartic acid levels, atteining at 35° C the control values in a majority of investigated regions.The possible explanations and significance of the results obtained have been briefly discussed.