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Articles 6301 - 6330 of 6345
Full-Text Articles in Neuroscience and Neurobiology
Sensory Modulation Of Juvenile Play In Rats, Stephen M. Siviy, Jaak Panksepp
Sensory Modulation Of Juvenile Play In Rats, Stephen M. Siviy, Jaak Panksepp
Psychology Faculty Publications
A series of experiments was conducted to determine the extent to which somatosensory stimulation is necessary for the elaboration of juvenile play in rats. Anesthetization of the dorsal body surface of juvenile rats with xylocaine reduced the frequency of pinning, an indicator variable for play, by 35% to 70%, while motivation to play, measured by dorsal contacts, an index of play solicitation, remained largely intact. These data suggest that dorsal body surface anesthetization impairs the ability of juvenile rats to perceive and/or respond to playful gestures. When untreated animals were paired with xylocaine-treated animals, the xylocaine-treated animals consistently pinned the …
Speedreading, Marcel Just, Patricia Carpenter
Dyslexia, Marcel Adam Just, Patricia A. Carpenter
Dyslexia, Marcel Adam Just, Patricia A. Carpenter
Marcel Adam Just
No abstract provided.
Spatial And Temporal Response Patterns On The Eight-Arm Radial Maze, Robert H.I. Dale
Spatial And Temporal Response Patterns On The Eight-Arm Radial Maze, Robert H.I. Dale
Scholarship and Professional Work - LAS
Six maze-experienced hooded rats were timed during five trials on which they collected water from all arms of an eight-arm radial maze, then made five more choices. All subjects frequently exhibited a “task-completion pause:” The subjects rarely spent more than 1 sec in the center of the maze between choices until they had entered all eight arms, then stopped in the center of the maze. In contrast, the time spent in each arm gradually increased until all of the water had been obtained, then decreased slightly. Four subjects began every trial by choosing eight consecutive adjacent arms. The task-completion pause …
Olfactory Responses Of Aquatic And Terrestrial Salamanders To Air And Waterborne Stimuli, Adam Artz, Wayne Silver, J Russell Mason, Larry Clark
Olfactory Responses Of Aquatic And Terrestrial Salamanders To Air And Waterborne Stimuli, Adam Artz, Wayne Silver, J Russell Mason, Larry Clark
Larry Clark
Electro-olfactograms (EOGs) were used to assess olfactory responding by aquatic larval and terrestrial adult tiger salamanders (Ambystoma tigrinum) to airborne volatile compounds, and volatile and non-volatile compounds in aqueous solution. Both forms of salamander showed saturation effects to presentations of airborne stimuli (Fig. 2). Saturation was not observed, however, to stimulus presentations in aqueous solution (Figs. 2, 3). When threshold values and concentration-response curve parameters were compared, non-volatile amino acids in solution were more potent stimuli for larvae while airborne volatiles were more potent stimuli for adults (Tables 1, 2). We infer that metamorphosis in the tiger salamander is accompanied …
The Hippocampus As Episodic Encoder: Does It Play Tag?, Robert H.I. Dale
The Hippocampus As Episodic Encoder: Does It Play Tag?, Robert H.I. Dale
Scholarship and Professional Work - LAS
Rawlins’s characterization of the hippocampus as a “high-capacity, immediate-term memory store” captures the essential idea in a number of previous models. For example, Gaffan (1974), Gray (1984), Hirsh (1980), Kesner (Bierley, Kesner & Novak 1983), Olton (Olton, Becker & Handelmann 1979), Solomon (1980), and Winocur (1980) all agree that hippocampal animals show memory deficits when required to identify, for whatever reason, one specific event out of a list of recent events. Although these authors disagree on a number of details, Rawlins has identified their models common ground, the core of each model. (It is only fair to note that Gaffan …
Personality Characteristics And Two Types Of Relaxation Associated With Personal Adjustment And Anxiety Reduction, Steven Michael Schwartz
Personality Characteristics And Two Types Of Relaxation Associated With Personal Adjustment And Anxiety Reduction, Steven Michael Schwartz
Dissertations, Theses, and Masters Projects
No abstract provided.
Cognitive Coordinate Systems: Accounts Of Mental Rotation And Individual Differences In Spatial Ability, Marcel Adam Just, Patricia A. Carpenter
Cognitive Coordinate Systems: Accounts Of Mental Rotation And Individual Differences In Spatial Ability, Marcel Adam Just, Patricia A. Carpenter
Marcel Adam Just
No abstract provided.
Limitations On Spatial Memory In Mice, Robert H.I. Dale, Martin Bedard
Limitations On Spatial Memory In Mice, Robert H.I. Dale, Martin Bedard
Scholarship and Professional Work - LAS
Rats have an impressive ability to remember locations they have visited. Two experiments used an eight-arm radial maze to determine whether mice showed two important characteristics of this spatial memory: its durability, and its dependence on stimuli outside the maze (extreme stimuli). In Experiment 1, food-deprived mice were allowed to eat from four of the eight arms of the maze then, after delays of 5 sec, 1 min, or 5 min, they were permitted to choose the remaining arms. Choice accuracy declined significantly with the longer delays, but always remained above chance. In Experiment 2, the maze was rotated 180° …
Sective Deficits In The Sense Of Smell Caused By Chemical Modification Of Olfactory Epithelium, J Russell Mason, Larry Clark, Thomas Morton
Sective Deficits In The Sense Of Smell Caused By Chemical Modification Of Olfactory Epithelium, J Russell Mason, Larry Clark, Thomas Morton
Larry Clark
A chemically selective procedure for covalent modification of Schiff base-forming binding sites in proteins is demonstrated in vitro. In vivo studies show that the same procedure produces a selective anosmia ("odor blindness") when applied to the olfactory epithelia of experimental animals. Surgical experiments confirm that the sense of smell is specifically affected.
Electroencephalographic Spectra Preceding Spontaneous Blinks, Marion Auerswald Eppler
Electroencephalographic Spectra Preceding Spontaneous Blinks, Marion Auerswald Eppler
Dissertations, Theses, and Masters Projects
No abstract provided.
Modification Of A Rapidly Transported Protein In Regenerating Nerve, Bruce Tedeschi, David L. Wilson
Modification Of A Rapidly Transported Protein In Regenerating Nerve, Bruce Tedeschi, David L. Wilson
Biology Articles and Papers
From 1 to 28 days after frog sciatic nerve damage, dorsal root ganglia were incubated with [35S] methionine, and the labeled, rapidly transported proteins at various points along the nerve were analyzed on two-dimensional gels. The results show a dramatic increase in the labeling of a protein, which we have designated as A25, only after the arrival of the rapidly transported proteins at regenerating nerve tips. This effect is first seen 3 to 5 days after injury. On gels from regenerating nerves, A25 appears as a series of intense spots with an apparent molecular weight of 70,000. A25 is retrogradely …
Rapid Decline In Acetylcholine Release And Content Of Rat Extensor Digitorum Longus Muscle After Denervation, Diana Linden, Michael Newton, Alan Grinnell, Donald Jenden
Rapid Decline In Acetylcholine Release And Content Of Rat Extensor Digitorum Longus Muscle After Denervation, Diana Linden, Michael Newton, Alan Grinnell, Donald Jenden
Diana Linden
The amount of acetylcholine (ACh) and choline (Ch) in normal and denervated rat extensor digitorum longus (EDL) muscles, as well as that released spontaneously from these muscles, was determined by an extremely sensitive gas chromatographicmass spectrometric assay method. We found decreases in ACh content and spontaneous, resting ACh release as early as 8 h after denervation. The ACh content decreased to a plateau of 30% of control by 11 h; ACh release attained a plateau of 50% of control several hours later. These results showed that in denervated EDL muscles ACh content and spontaneous release (measured biochemically) decreased before nerve-evoked …
Age-Changes Of The Neuronal Component Of Meissner Corpuscles In The Mouse Digital Pad, Roger C. Mathewson
Age-Changes Of The Neuronal Component Of Meissner Corpuscles In The Mouse Digital Pad, Roger C. Mathewson
Loma Linda University Electronic Theses, Dissertations & Projects
Silver impregnated sections of mouse digital pads were studied using light microscopy to detect age-related changes of the neuronal component of Meissner corpuscles. Direct microscopic observation, photomicrographs and camera lucida tracing were utilized. From qualitative observation, the corpuscular neurites were found to undergo morphological age-related changes of diameter, tortuosity, varicosity, branching and terminal expansion size. Quantitative examination was made of the number of corpuscles, corpuscular neurites, branching neurites, cross-innervations, terminal neurite expansions, neurite intraepidermal continuations and terminal axonal processes. The number of corpuscles and neurite intraepidermal continuations decreased with age while having significant linear correlation; whereas, branching increased with age …
The Relationship Between Whole Brain Catecholamine Depletion In Carassius Auratus And The Exposure To Inescapable Shock In A Learned Helplessness Paradigm, Roderick J. Misunis
The Relationship Between Whole Brain Catecholamine Depletion In Carassius Auratus And The Exposure To Inescapable Shock In A Learned Helplessness Paradigm, Roderick J. Misunis
Masters Theses
Learned helplessness is a psychological concept that describes the subsequent escape-avoidance behavior of experimental subjects who are exposed to uncontrollable stressors. Subjects after treatment are unable to respond in situations where escape is possible. Two major theorists, Seligman and Weiss, have proposed explanations concerning the phenomena. Seligman feels that the subject is unable to respond due to the fact that the exposure to an uncontrollable stressor has caused him to learn to be "helpless". Weiss feels that the inability to respond can best be described by alterations in the subject's brain neurochemistry, specifically the neurotransmitter norepinephrine. This paper is an …
Parallel-Arm Maze Performance Of Sighted And Blind Rats: Spatial Memory And Maze Structure, Robert H.I. Dale
Parallel-Arm Maze Performance Of Sighted And Blind Rats: Spatial Memory And Maze Structure, Robert H.I. Dale
Scholarship and Professional Work - LAS
Sighted and peripherally blinded groups of rats learned to obtain a small reward from each arm of an eight-arm parallel maze, and a sighted group was similarly trained on a radial maze. The parallel-sighted and parallel-blind groups were equally slow, and much slower than the radial-sighted group, to attain criterion performance. The three groups shared several response characteristics: selectively avoiding the most recently entered arms, frequently choosing adjacent arms, and an absence of 'spatial generalization' among the arms. The findings support a simple model proposing how subjects identify and choose among the maze-arms.
Validation Of The Tactual Performance Test As An Organicity Screening Device, Stephen C. Lippold
Validation Of The Tactual Performance Test As An Organicity Screening Device, Stephen C. Lippold
Masters Theses
Organicity screening devices are those psychometric tests used to detect brain dysfunction during the initial assessment. The characteristics of such tests were listed and ones currently being used were reviewed. The review concentrated on the validity and clinical utility of these organicity tests. From the review it was concluded that the validity has not been thoroughly established, partially because weak criteria have been used. It was also concluded that current screening tests have questionable clinical utility, since an inordinant number of organically impaired people are not detected by the tests. The concept of organicity was discussed, and the Tactual Performance …
Radial-Maze Performance In The Rat Following Lesions Of Posterior Neocortex, Melvyn A. Goodale, Robert H.I. Dale
Radial-Maze Performance In The Rat Following Lesions Of Posterior Neocortex, Melvyn A. Goodale, Robert H.I. Dale
Scholarship and Professional Work - LAS
The present experiment was designed to investigate the role of posterior neocortex (areas 17, 18 and 18a) in the maintenance of performance on the radial maze. Following training to criterion on the 8-arm radial maze, rats received either sham operations, bilateral eye enucleations, lesions of posterior neocortex, or combined enucleations and lesions of posterior neocortex. While the enucleated animals with intact brains showed a slight, but significant performance decrement relative to the sham-operated group, the other two groups, with lesions of areas 17, 18 and 18a, each showed a massive deficit. This large deficit was observed even in the group …
The Ferret - A Useful Model For Studying Visual Pathway Development, Diana Linden
The Ferret - A Useful Model For Studying Visual Pathway Development, Diana Linden
Diana Linden
No abstract provided.
A Theory Of Reading: From Eye Fixations To Comprehension, Marcel Adam Just, Patricia A. Carpenter
A Theory Of Reading: From Eye Fixations To Comprehension, Marcel Adam Just, Patricia A. Carpenter
Marcel Adam Just
No abstract provided.
Patterns Of Fetal Lamb Regional Cerebral Blood Flow During And After Prolonged Hypoxia, Stephen Ashwal, John S. Majcher, Nestor Vain, Lawrence D. Longo
Patterns Of Fetal Lamb Regional Cerebral Blood Flow During And After Prolonged Hypoxia, Stephen Ashwal, John S. Majcher, Nestor Vain, Lawrence D. Longo
Loma Linda University Electronic Theses, Dissertations & Projects
[Abstract not included]
Speculation: In the fetal lamb during prolonged intrauterine hypoxia, total and regional cerebral blood flows increase to the same extent without evidence of preferential shunting to critical brainstem or subcortical areas. Neuropathologic studies have indicated relative sparing of these areas during similar animal experimental or human neonatal conditions. This suggests that the pattern of hypoxic ischemic insult to the neonatal central nervous system associated with asphyxia may differ from that produced by hypoxia alone. In addition, during asphyxia these pathologic changes may result primarily from hypotension and decreased regional cerebral blood flow, or from regional metabolic derangements …
Biosynthesis And Degradation Of Acetylcholine Receptors In Rat Skeletal Muscles. Effects Of Electrical Stimulation, Diana Linden, D.M. Fambrough
Biosynthesis And Degradation Of Acetylcholine Receptors In Rat Skeletal Muscles. Effects Of Electrical Stimulation, Diana Linden, D.M. Fambrough
Diana Linden
Synthesis and degradation of acetylcholine receptors in rat skeletal muscles were measured in organ culture. The rate of de novo biosynthesis and incorporation of acetylcholine receptors into extrajunctional membranes of denervated muscles was measured by determining the rate of appearance of [1] [2H, 13C, 15N]-acetylcholine receptors when muscles were cultured in medium containing [1] [2H, 13C, 15N]-amino acids. Denervated extensor digitorum longus and soleus muscles were found to synthesize new receptors for several days in organ culture at an average rate of 1.4%/h. The degradation rates for extrajunctional and junctional acetylcholine receptors were estimated by irreversibly labeling acétylcholine receptors on …
Ethological Considerations In The Experimental Study Of Lizard Behavior, Neil Greenberg
Ethological Considerations In The Experimental Study Of Lizard Behavior, Neil Greenberg
Neil Greenberg
The importance of an ethological approach to the experimental study of an unfamiliar species is described and several of its problems discussed. The selection of units of behavior is a crucial first step in the development of a behavior inventory. The correlation of a behavioral unit with a particular context is necessary to ascribe function to that to that unit and to develop an ethogram. Methods of studying lizards under controlled conditions are described and discussed. Constraints on behavior that must be considered in an experimental study include the microclimate and its thermal qualities, food and water, shelter utilization, and …
Material-Specific Processes In Tactile Short-Term Memory, Christina Anne Meyers
Material-Specific Processes In Tactile Short-Term Memory, Christina Anne Meyers
Dissertations and Theses
Studies concerning tactile short-term memory (short-term memory or the sense of touch) have often been contradictory. Some of these studies support the existence of modality-specific tactile memory, a separate, independent storage system for tactile information. Other studies do not support such a system. Further, confusion has arisen regarding the tactile test materials, since many of them use common shapes which are easily labeled verbally. It is hypothesized that information which can be labeled is stored in material-specific verbal memory in the left hemisphere, while patterned or spatial information is stored in material-specific nonverbal memory in the right hemisphere.
This paper …
Stress Reactions By Black Females In Viewing Conflict And No-Conflict Videotapes Of A Black Male Or Female As A Function Of The Subject's Blood Pressure Level And Of History Of Stress, Andrea Jean James-Andrews
Stress Reactions By Black Females In Viewing Conflict And No-Conflict Videotapes Of A Black Male Or Female As A Function Of The Subject's Blood Pressure Level And Of History Of Stress, Andrea Jean James-Andrews
Dissertations, Theses, and Masters Projects
No abstract provided.
Ethological Considerations In The Experimental Study Of Lizard Behavior, Neil Greenberg
Ethological Considerations In The Experimental Study Of Lizard Behavior, Neil Greenberg
Faculty Publications and Other Works -- Ecology and Evolutionary Biology
The importance of an ethological approach to the experimental study of an unfamiliar species is described and several of its problems discussed. The selection of units of behavior is a crucial first step in the development of a behavior inventory. The correlation of a behavioral unit with a particular context is necessary to ascribe function to that to that unit and to develop an ethogram. Methods of studying lizards under controlled conditions are described and discussed. Constraints on behavior that must be considered in an experimental study include the microclimate and its thermal qualities, food and water, shelter utilization, and …
Relationships Among Skin Conductance Activity, Averaged Evoked Potential Amplitude, And Behavior In Chronic Schizophrenia, C. Michael Powell
Relationships Among Skin Conductance Activity, Averaged Evoked Potential Amplitude, And Behavior In Chronic Schizophrenia, C. Michael Powell
Dissertations, Theses, and Masters Projects
No abstract provided.
Similarities In Analgesia Produced By Cervical Probing And Intracranial Stimulation To The Mesencephalic Grey Matter, Kathleen Casey Westlake
Similarities In Analgesia Produced By Cervical Probing And Intracranial Stimulation To The Mesencephalic Grey Matter, Kathleen Casey Westlake
Dissertations, Theses, and Masters Projects
No abstract provided.
The Effects Of Startle Stimulus Probability On The Human Electromyographic Startle Response, John Louis Toukatly
The Effects Of Startle Stimulus Probability On The Human Electromyographic Startle Response, John Louis Toukatly
Dissertations, Theses, and Masters Projects
No abstract provided.
The Relative Attenuation Of Self-Stimulation, Eating And Drinking Produced By Dopamine-Receptor Blockade, E. T. Rolls, B. J. Rolls, P. H. Kelly, S. G. Shaw, R. J. Wood, Robert H.I. Dale
The Relative Attenuation Of Self-Stimulation, Eating And Drinking Produced By Dopamine-Receptor Blockade, E. T. Rolls, B. J. Rolls, P. H. Kelly, S. G. Shaw, R. J. Wood, Robert H.I. Dale
Scholarship and Professional Work - LAS
Spiroperidol, which blocks dopamine (DA) receptors, attenuated self-stimulation of the nucleus accumbens, septal area, hippocampus, anterior hypothalamus and ventral tegmental area. Dopamine is thus involved in self-stimulation of many sites (in addition to the lateral hypothalamus). The attenuation was not a simple motor impairment of the speed of bar-pressing in that the nucleus accumbens and septal self-stimulation rates were lower than those in treated animals self-stimulating at other sites (Experiment 1). Feeding was partly attenuated, and drinking was much less attenuated by the spiroperidol. Since the rats bar-pressed for brain- stimulation reward, chewed pellets to eat, and licked a tube …