| 1. |
- Eriksson, Joakim, et al.
(författare)
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Simulation of Physical Disabilities in Computer Designs of Environments
- 1993
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Ingår i: Proceedings of the European Conference on the Advancement of Rehabilitation Technology. ; , s. 3-40
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Konferensbidrag (refereegranskat)abstract
- This paper presents some methods of improving the simulation of human movements. Since we are developing a tool for the planning of environments for physically disabled persons, it is important to consider the future user’s abilities in particular. Methods such as the use of human models, acquiring joint ranges and motions (from MacReflex and DataGlove systems), editing postures and motions, setting up libraries of postures and motions and the use of Virtual Reality systems is discussed.
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| 2. |
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| 3. |
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| 4. |
- Eriksson, Magnus, 1956-
(författare)
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Den pågående utopin : Om Björn Ranelid
- 1990
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Ingår i: Samtida. - Stockholm : Alba. - 9174581171 ; , s. 124-141
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 5. |
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| 6. |
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| 7. |
- Eriksson, Magnus, 1956-
(författare)
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The Formation of an Artistic Identity : The Young Artur Lundkvist
- 1994
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Ingår i: Scandinavian Studies. - : University of Illinois Press. - 0036-5637 .- 2163-8195. ; 66:3, s. 382-399
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Discusses the nature of the literary influence that shaped the artistic identity of Swedish poet Artur Lundkvist. Influence of foreign authors on Lundkvist's literary style; Lundkvist's criticism of the continuing dependence of his contemporaries on forms established by previous generations; Assimilation of the diction and lyric patterns from foreign poets.
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| 8. |
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| 9. |
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| 10. |
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| 11. |
- Eriksson, Magnus, 1956-
(författare)
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Über Björn Ranelid
- 1994
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Ingår i: <em>Präsentationen</em>. - Morsbach : Norden. - 3927153419 ; , s. 95-131
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 12. |
- Königsson, Lars-König, 1933-, et al.
(författare)
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Människa, Ekonomi och Miljö i Gamla Uppsala
- 1993
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Ingår i: Arkeologi och miljögeologi i Gamla Uppsala. - Uppsala : Societas archaelogica Upsaliensis. - 9150609734 ; , s. 79-86, s. 79-86
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 13. |
- Niklasson, Magnus, et al.
(författare)
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Effects of GABAB activation and inhibition on vestibulo-ocular and optokinetic responses in the pigmented rat
- 1994
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Ingår i: Brain Research. - : Elsevier. - 0006-8993 .- 1872-6240. ; 649:1-2, s. 151-158
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Tidskriftsartikel (refereegranskat)abstract
- The effects of the GABAB agonist baclofen and the GABAB antagonist CGP 35348, given separately or simultaneously, on the central vestibular system of pigmented rats have been evaluated. Drugs were administered either intramuscularly or intracerebroventricularly. Eye movements were recorded during vestibular, optokinetic and combined visual-vestibular stimulation. Activation of the GABAB receptors by baclofen caused a dose related disturbance of the system, manifested by (1) a decrease of the optokinetic gain, (2) a reduced ability to suppress nystagmus during conflicting vestibular and visual input, and (3) a disability to maintain the eccentric eye position upon a spontaneous saccade. All these effects could be inhibited in a dose-dependent fashion by CGP 35348, suggesting that the findings are specifically related to the GABAB receptor. Given separately, the antagonist did not affect the mentioned parameters. During horizontal acceleratory/deceleratory stimulation in darkness baclofen caused a biphasic pattern in the dose-response curves. Small amounts of baclofen caused an increase of the gain and of the duration of poststimulatory nystagmus, while high doses had a depressive action on the same parameters. The stimulating effect of baclofen could be inhibited or even reversed by CGP 35348, which has a depressive effect per se, similar to the effects of baclofen given in the upper range of doses.
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| 14. |
- Niklasson, Magnus, et al.
(författare)
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Effects of toluene, styrene, trichloroethylene, and trichloroethane on the vestibulo- and opto-oculo motor system in rats
- 1993
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Ingår i: Neurotoxicology and Teratology. - 0892-0362 .- 1872-9738. ; 15:5, s. 327-334
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Tidskriftsartikel (refereegranskat)abstract
- The acute effects of inhalation of four solvents on the central vestibular system of rats were analyzed by recording eye movements upon different stimuli. The dose-response relationship was investigated. Optokinetic stimulation was obtained by placing the animals in front of a surrounding visual pattern, moving at different velocities. The slow-phase eye velocity (SPV) of nystagmus was calculated and divided by the stimulus velocity, giving the gain. All the solvents caused a decrease of the gain. Vestibular stimulation was performed on a turntable by an angular acceleration/deceleration in darkness. The SPV and the duration of the post-stimulatory nystagmus were calculated. The shape of the SPV dose-response curves differed among the four solvents. Toluene, styrene, and trichloroethylene prolonged the duration of nystagmus while trichloroethane did not. A conflicting vestibular and optokinetic stimulation was performed by an angular acceleration/deceleration with a surrounding visual pattern moving with the turntable. All solvents decreased the ability to cancel nystagmus, elicited by vestibular stimulation in conflict with a visual input. Quick movements of the eyes, saccades, were elicited by tactile stimulation. Toluene, styrene, and trichloroethylene changed the generation of the saccades while trichloroethane did not. Most of the findings indicate a common site of action in the central vestibular system, viz., the cerebellar-vestibular circuit. However, within this domain, there are evident differences in the effects among the solvents. This finding, together with previous results obtained in other experimental models of the central nervous system (CNS), suggest that different solvents should be considered as individual compounds. While the current results are consistent with the notion that solvents affect cerebellar-vestibular function, they also demonstrate differences on selected components of this system which may be of concern.
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| 15. |
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| 16. |
- Niklasson, Magnus, et al.
(författare)
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The influence of visual and somatosensory input on the vestibulo-oculomotor reflex of pigmented rats
- 1991
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Ingår i: Journal of Vestibular Research-Equilibrium & Orientation. - 0957-4271 .- 1878-6464. ; 1:3, s. 251-262
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Tidskriftsartikel (refereegranskat)abstract
- Eye movements were recorded in the pigmented rat during vestibular, optokinetic and combined visual-vestibular stimulation. The dominant time constant in pigmented rats, tested during angular vestibular stimulation in darkness, is about two times longer than the cupular time constant. The gain and the duration of nystagmus, achieved by angular vestibular stimulation, can be enhanced by visual impulses. This is most evident during an optokinetic temporonasal stimulation, but is also seen with a nasotemporal stimulation. A mere optokinetic monocular stimulation without a synchronous vestibular excitation causes nystagmus only when the stimuli has a temporonasal direction. The duration of nystagmus, achieved by angular vestibular stimulation, is prolonged by disturbances of the neck proprioceptive system. This is more evident during a simultaneous visual input than in darkness. The ability to cancel nystagmus during conflicting vestibular and optokinetic impulses is well developed in the pigmented rat.
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| 17. |
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| 18. |
- Salhi, Nessima, et al.
(författare)
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Structural and spectroscopic properties of a set of donor-acceptor molecules with and without spacers : Part 2. Piperonyl and julolidyl groups as donors
- 1992
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Ingår i: Journal of Molecular Structure. - 0166-1280. ; 262, s. 273-285
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Tidskriftsartikel (refereegranskat)abstract
- A series of donor-acceptor polyenes exhibiting potential switching properties are studied using semiempirical techniques. Heats of formation, ionization potentials, dipole moments and molecular geometries for the ground states are obtained from MNDO and AM1 calculations, whereas the properties of the excited states are provided by the spectroscopic model zindo. The differences in the description of the ground state properties are, except for torsional angles, minor between MNDO and AM1, and it is found that AM1 systematically predicts more planar structures. For some of the molecules PM3 calculations were performed, leading to geometry descriptions very similar to those obtained with AM1. The HOMOs and LUMOs are delocalized in the systems where no spacer is present, and localized on the donor part and on the acceptor part, respectively, in the systems where an insulating spacer is included. In the former systems, no significant charge transfer effects are observed when exciting from the ground states. In the latter systems, the HOMO to LUMO transitions result in a significant charge transfer effect, although with very low probabilities.
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| 19. |
- Tham, Richard, et al.
(författare)
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The effect of toluene on the vestibulo- and opto-oculomotor system in rats, pretreated with GABAergic drugs
- 1990
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Ingår i: Neurotoxicology and Teratology. - : Elsevier. - 0892-0362 .- 1872-9738. ; 12:4, s. 307-311
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Tidskriftsartikel (refereegranskat)abstract
- Toluene, an aromatic solvent, prolongs the duration of nystagmus induced by a rotatory acceleration or by an optokinetic stimulation in the pigmented rat. Baclofen, an agonist of GABAB receptors, and 4,5,6,7-tetrahydroisoxazolo[5,4-c]-pyridin-3-ol (THIP), an agonist of GABAA receptors are able to block this toluene effect on the vestibular system. On the contrary diazepam, which by itself causes an evident reduction of the duration of acceleratory nystagmus, is not able to block the toluene effect. The results indicate that the toluene effect is related to GABA transmission and that the solvent interacts by a rather receptor specific mechanism of action.
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