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Sökning: WFRF:(Archer Trevor 1949 )

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11.
  • Archer, Trevor, 1949, et al. (författare)
  • Attention-Deficit/Hyperactivity Disorder: Focus upon Aberrant N-Methyl-D-Aspartate Receptors Systems
  • 2016
  • Ingår i: R. M. Kostrzewa & T. Archert (Eds.), Neurotoxin Modeling of Brain Disorders – Life-long Outcomes in Behavioral Teratology, Volume 29 of the series Current Topics in Behavioral Neurosciences.. - Amsterdam : Springer. - 9783319341347 ; , s. 295-311
  • Bokkapitel (refereegranskat)abstract
    • Attention-deficit/hyperactivity disorder (ADHD) pathophysiology persists in an obscure manner with complex interactions between symptoms, staging, interventions, genes, and environments. Only on the basis of increasing incidence of the disorder, the need for understanding is greater than ever. The notion of an imbalance between central inhibitory/excitatory neurotransmitters is considered to exert an essential role. In this chapter, we first review how the default mode network functions and dysfunction in individuals diagnosed with ADHD. We also present and briefly review some of the animal models used to examine the neurobiological aspects of ADHD. There is much evidence indicating that compounds/interventions that antagonize/block glutamic acid receptors and/or block the glutamate signal during the "brain growth spurt" or in the adult animal may induce functional and biomarker deficits. Additionally, we present evidence suggesting that animals treated with glutamate blockers at the period of the "brain growth spurt" fail to perform the exploratory activity, observed invariably with control mice, that is associated with introduction to a novel environment (the test cages). Later, when the control animals show less locomotor and rearing activity, i.e., interest in the test cages, the MK-801, ketamine and ethanol treated mice showed successively greater levels of locomotion and rearing (interest), i.e., they fail to "habituate" effectively, implying a cognitive dysfunction. These disturbances of glutamate signaling during a critical period of brain development may contribute to the ADHD pathophysiology. As a final addition, we have briefly identified new research venues in the interaction between ADHD, molecular studies, and personality research.
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12.
  • Archer, Trevor, 1949, et al. (författare)
  • Behavioural supersensitivity following neonatal 6-hydroxydopamine : Attenuation by MK-801
  • 2007
  • Ingår i: Neurotoxicity research. - 1029-8428 .- 1476-3524. ; 12:2, s. 113-124
  • Tidskriftsartikel (refereegranskat)abstract
    • Male rat pups were administered 6-hydroxydopamine (6-OHDA, 75 μg, intracisternally, 30 min after desipramine, 25 mg/kg, s.c.) on Days 1 or 2 after birth, or were sham-operated (receiving vehicle). In four experiments, the acute effects of apomorphine, with or without pretreatment with MK-801 (0.03 mg/kg), upon motor activity in test chambers was measured. Acute treatment with apomorphine (0.1 mg/kg) increased locomotor, rearing and total activity markedly compared to both the acute saline administered 6-OHDA rats and the sham-operated rats administered saline. Acute MK-801 (0.03 mg/kg) co-administered shortly before (5 min) apomorphine (0.3 or 1.0 mg/kg) reduced markedly locomotion and total activity in 6-OHDA-treated and sham-operated rats. Rearing behaviour was increased in both the 6-OHDA groups of rats. Acute MK-801 increased activity in the 6-OHDA-treated rats, which was not observed in sham-operated rats. At the 0.3 and 1.0 mg/kg doses of apomorphine, neonatal 6-OHDA treament increased all three parameters of motor activity. Acute treatment with apomorphine (0.1 mg/kg) induced different effects on the motor activity of 6-OHDA-treated and sham-operated mice. In sham-operated rats apomorphine reduced motor activity during the 1st 30-min period but increased locomotion and total activity, but not rearing, during the 2nd and 3rd periods, whereas in 6-OHDA-treated rats, apomorphine increased locomotor, rearing and total activity markedly. Dopamine loss and serotonin elevation in the striatum and olfactory tubercle were confirmed. The present findings confirm the influence of non-competitive glutamate antagonists in attenuating the behavioural supersensitivity to dopamine antagonists.
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13.
  • Archer, Trevor, 1949, et al. (författare)
  • Clinical staging in the pathophysiology of psychotic and affective disorders: facilitation of prognosis and treatment.
  • 2010
  • Ingår i: Neurotoxicity research. - : Springer Science and Business Media LLC. - 1476-3524 .- 1029-8428. ; 18:3-4, s. 211-28
  • Tidskriftsartikel (refereegranskat)abstract
    • The prevailing utility, and indeed necessity, of clinical staging models applied in considerations of neuropsychiatric disease progressions is discussed from the perspectives of schizophrenia spectrum disorders and affective disorders, cannabis in schizopsychotic disorder, incidences of affect and psychosis, staging disorders in aging and the indices and prevalence of apathy. There would appear to be a strong current consensus that the pursuit of clinical staging of these and other brain disease states has contributed a systematic conceptual instrument to facilitate the better understanding, diagnosis, prognosis and treatment as derived from a multitude of genetic predispositions, symptoms and syndromes, early-onset and prodromal phases, recurrences and relapses, that have complicated the situation of the patient. Through a staging determination of the disorder, elements of diagnosis will describe the progression of symptoms/syndromes through pre-onset, prodromal, first-episode, recurrences and relapses, and treatment resistance thereby facilitating the eventual prognosis, intervention alternatives and treatment. This approach varies from observations of individuals at early stages of development (infancy, childhood, adolescece) to early middle age, in the case of diseases expressed through the aging processes. Essentially, the major contribution of the staging model may lie in the early identification, diagnosis, and treatments of disorders that afflict the brain and central nervous system.
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14.
  • Archer, Trevor, 1949, et al. (författare)
  • Cognitive benefits of exercise intervention
  • 2016
  • Ingår i: Clinica Terapeutica. - 0009-9074 .- 1972-6007. ; 167:6, s. 180-185
  • Tidskriftsartikel (refereegranskat)abstract
    • © Società Editrice Universo (SEU).Exercise, as a potent epigenetic regulator, implies the potential to counteract pathophysiological processes and alterations in most cardiovascular/respiratory cells and tissues not withstanding a paucity of understanding the underlying molecular mechanisms and doseresponse relationships. In the present account, the assets accruing from physical exercise and its influence upon executive functioning are examined. Under conditions of neuropsychiatric and neurologic ill-health, age-related deterioration of functional and biomarker indicators during healthy and disordered trajectories, neuroimmune and affective unbalance, and epigenetic pressures, exercise offers a large harvest of augmentations in health and well-being. Both animal models and human studies support the premise of manifest gains from regular exercise within several domains, besides cognitive function and mood, notably as the agency of a noninvasive, readily available therapeutic intervention.
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15.
  • Archer, Trevor, 1949, et al. (författare)
  • Cognitive Symptoms Facilitatory for Diagnoses in Neuropsychiatric Disorders: Executive Functions and Locus of Control
  • 2008
  • Ingår i: Neurotoxicity Research. ; 14:2,3, s. 205-225
  • Tidskriftsartikel (refereegranskat)abstract
    • Cognitive symptoms, considered in conjunction both with their regional brain and biomarkers as well as affective, attributional and neurodevelopmental components, demonstate everincreasing complexity to facilate conceptualization yet, unavoidably, bedevil diagnosis in neuropsychiatry even before considerations of the enigmatic processes in memory, such as executive function and working memory, are draw into the myriads of equations that await remedial interpretations. Prefrontal and limbic regions of the brain are involved in a diversity of expressions of cognition, normal or dysfunctional, at synaptic, intracellular and molecular levels that mobilize a concatenation of signaling entities. Serotoninergic neurotransission at prefrontal regions directs cogntive-affective entities that mediate decision-making and goal-directed behaviour. Clinical, non-clinical and basic studies challenge attempts to consolidate the multitude of evidence in order to obtain therapeutic notions to alleviate the disordered status of the diagnosed and yet-to-be diagnosed individuals. Locus of control, a concept of some utility in health-seeking procedures, is examined in three self-report studies from the perspective of a cognitive- emotional situation through observations of ordinary, 'healthy' young and middle-aged individuals, to assess the predictors of internal and external locus of control. A notion based on high level executive functioning in the dorsolateral prefrontal cortex (DLPFC) in individuals characterised by internal locus of control is contrasted with a hypofunctional executive DLPFC, characterising individuals that express an external locus of control, is discussed.
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16.
  • Archer, Trevor, 1949, et al. (författare)
  • Delayed Exercise-Induced Functional and Neurochemical Partial Restoration Following MPTP
  • 2012
  • Ingår i: Neurotoxicity research. - : Springer Science and Business Media LLC. - 1029-8428 .- 1476-3524. ; 21:2, s. 210-221
  • Tidskriftsartikel (refereegranskat)abstract
    • In two experiments, MPTP was administered to C57/BL6 mice according to a single-dose weekly regime (MPTP: 1 x 30 mg/kg on the fifth day of the week, Friday, over 4 weeks) with vehicle group (Vehicle: 1 x 5 ml/kg) treated concurrently. Exercise schedules (delayed) were introduced either at the beginning of the week after the second MPTP injection (MPTP + Exercise(2) group), or at the beginning of the week after the fourth MPTP injection (MPTP + Exercise(4) group). Wheel-running was provided on the first 4 days of each week (Monday-Thursday) more than 30-min periods. In Experiment I, wheel-running exercise was introduced either after 2 or 4 weeks after MPTP/Vehicle. MPTP and Vehicle groups not provided access to the running wheels were placed in single cages within the wheel-running room over 30-min concomitantly with the wheel-running groups. In Experiment II, wheel-running exercise was introduced 2 weeks after MPTP/Vehicle but a no-exercise control group with non-revolving wheel included (MPTP-Wheel). In both experiments, spontaneous motor activity tests during 60-min intervals were performed at the end (Fridays) of weeks 1, 2, 3, 4, 6, 8, and 10, where the week on which the first injection of MPTP was the first week; in the case of weeks 1-4, this was immediately before MPTP/Vehicle injections. It was observed that the introduction of the exercise schedule after the second MPTP injection, but not after the fourth injection, restored motor activity that had been markedly elevated by the end of the tenth week. Subthreshold administration of l-dopa tests was performed after the spontaneous motor activity tests 6, 8 and 10; these indicated significant effects of exercise, MPTP + Exercise(2) group, on Tests 6 and 8, but not Test 10. The physical exercise schedule in that group also showed markedly attenuated loss of dopamine (DA). Restoration of MPTP-induced motor activity deficits and DA loss was a function of the point at which exercise was introduced, in the present case after two administrations of the neurotoxin. In Experiment II, physical exercise markedly attenuated the hypokinesic effect of MPTP in the exercise condition, MPTP-exercise, but not in the non-exercise conditions, MPTP-Cage and MPTP-Wheel, for both spontaneous motor activity and l-dopa-induced activity. MPTP-induced loss of DA was also attenuated by exercise.
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17.
  • Archer, Trevor, 1949, et al. (författare)
  • Drug abuse neurotoxicity: alcohol and nicotine as developmental stressors
  • 2013
  • Ingår i: Handbook of Neurotoxicity. - : Springer. - 9781461458357 ; , s. 2003-2023
  • Bokkapitel (refereegranskat)abstract
    • Drugs of abuse have the property of inducing adverse health complications, not least neurotoxicity under conditions where both the environmental conditions and activity states associated with their intake may strongly enhance drug toxicity, thereby causing life-threatening health complications and tragedy for relations and caregivers. While both chronic alcohol and/or nicotine abuse induce a variety of neuropathological effects, including damage to the brain, the extent of damage and disruption observed in the developing brain and CNS is a considerable affliction for the affected individuals. On the basis of laboratory and clinical studies, the potential of chemicals, including therapeutic and abused agents, to induce neurotoxic effects has been assessed, with considerations of abuse drugs neurotoxicity encompassing several factors that may accelerate and complicate prevailing conditions; the type and influence of environmental conditions, the presence of daily habits such as coffee breaks/smoking breaks, nutritional status, and neuroimmune system mobilization. Abuse neurotoxicity at several stages of early development, alcohol neurotoxicity, nicotine neurotoxicity, and combinations of alcohol-nicotine neurotoxicity present a threatening scenario of two compounds, benefitting from legality and availability that nevertheless have such potential for destruction over multiple domains, particularly in the undeveloped brain.
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18.
  • Archer, Trevor, 1949, et al. (författare)
  • Effect of age upon leadership attributes from recruitment instrument: a selective development trajectory
  • 2015
  • Ingår i: Clinical and Experimental Psychology. - 2471-2701. ; 1:1
  • Tidskriftsartikel (refereegranskat)abstract
    • This exploratory report presents the contents of a large data-base consisting of psychometric measurement of personality-related attributes of individuals who underwent the recruitment process by completing the JobMatchTalent instrument that was developed from principles of occupational psychology. On the basis of individuals’, who applied for corporate or governmental leadership positions, responses, the correlations between applicants’ age and personal attributes was obtained. Correlational and regression analyses were used to explore differences between younger and older potential executive participants. These indicated that younger leadership applicants enjoyed an advantage with regard to: ”Focus-on-details”, ”Focus-on-order”, ”Own motivation”, ”Concentration”, ”Will-power”, ”Winner-instinct”, ”Visions-for-the-future”, whereas older leadership applicants enjoyed an advantage with regard to: ”Sphere-of-influence”, ”Tolerant attitude” and ”Trust-in-others”. The levels of stress-sensitivity, strategic focus, energy and communication, as expressed by younger and older recruitment applicants seeking executive positions, were comparable. At higher age levels, the leadership candidates expressed less focus on the tasks and less orientation towards their own ambitions but were rather more concerned with developing their staff, building relations and ‘team-spirit’
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19.
  • Archer, Trevor, 1949 (författare)
  • Effects of Exogenous Agents on Brain Development: Stress, Abuse and Therapeutic Compounds.
  • 2010
  • Ingår i: CNS neuroscience & therapeutics. - : Wiley. - 1755-5949 .- 1755-5930.
  • Tidskriftsartikel (refereegranskat)abstract
    • SUMMARY The range of exogenous agents likely to affect, generally detrimentally, the normal development of the brain and central nervous system defies estimation although the amount of accumulated evidence is enormous. The present review is limited to certain types of chemotherapeutic and "use-and-abuse" compounds and environmental agents, exemplified by anesthetic, antiepileptic, sleep-inducing and anxiolytic compounds, nicotine and alcohol, and stress as well as agents of infection; each of these agents have been investigated quite extensively and have been shown to contribute to the etiopathogenesis of serious neuropsychiatric disorders. To greater or lesser extent, all of the exogenous agents discussed in the present treatise have been investigated for their influence upon neurodevelopmental processes during the period of the brain growth spurt and during other phases uptill adulthood, thereby maintaining the notion of critical phases for the outcome of treatment whether prenatal, postnatal, or adolescent. Several of these agents have contributed to the developmental disruptions underlying structural and functional brain abnormalities that are observed in the symptom and biomarker profiles of the schizophrenia spectrum disorders and the fetal alcohol spectrum disorders. In each case, the effects of the exogenous agents upon the status of the affected brain, within defined parameters and conditions, is generally permanent and irreversible.
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20.
  • Archer, Trevor, 1949, et al. (författare)
  • Effects of physical exercise on depressive symptoms and biomarkers in depression
  • 2014
  • Ingår i: CNS & Neurological Disorders. - Bussum : Bentham Science Publishers. - 1871-5273 .- 1996-3181. ; 13:10, s. 1640-1653
  • Tidskriftsartikel (refereegranskat)abstract
    • Regular physical exercise/activity has been shown repeatedly to promote positive benefits in cognitive, emotional and motor domains concomitant with reductions in distress and negative affect. It exerts a preventative role in anxiety and depressive states and facilitates psychological well-being in both adolescents and adults. Not least, several meta-analyses attest to improvements brought about by exercise. In the present treatise, the beneficial effects of exercise upon cognitive, executive function and working memory, emotional, self-esteem and depressed mood, motivational, anhedonia and psychomotor retardation, and somatic/physical, sleep disturbances and chronic aches and pains, categories of depression are discussed. Concurrently, the amelioration of several biomarkers associated with depressive states: hypothalamic-pituitary-adrenal (HPA) axis homeostasis, anti-neurodegenerative effects, monoamine metabolism regulation and neuroimmune functioning. The notion that physical exercise may function as "scaffolding" that buttresses available network circuits, anti-inflammatory defences and neuroreparative processes, e.g. brain-derived neurotrophic factor (BDNF), holds a certain appeal. © 2014 Bentham Science Publishers.
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