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  • Taste  (3)
  • 73.20.Dx  (2)
  • Parabrachial nucleus  (2)
  • 1
    Digitale Medien
    Digitale Medien
    Responses of solitary tract nucleus neurons to taste and mechanical stimulations of the oral cavity in decerebrate rats (1985)
    Springer
    Experimental brain research 60 (1985), S. 235-242 
    Details
    ISSN: 1432-1106
    Schlagwort(e): Decerebration ; Rats ; Solitary tract nucleus ; Taste ; Mechanoreception ; Receptive fields
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Physiological characteristics of 45 taste and 15 mechanoreceptive units were examined in the solitary tract nucleus (NTS) of rats decerebrated at the pre-or midcollicular level, and compared with previous findings in the intact rat. The rostro-caudal extent of the area, where taste and mechanoreceptive neurons were recorded, was almost the same in the decerebrate rat as that in intact rat. The spontaneous discharge rate was significantly lower in the decerebrate rat than in the intact rat. The taste profile of the NTS units in decerebrate rats was quite different from that in intact rats; significant decreases in correlation coefficients were found between certain pairs of taste stimuli and spontaneous discharge rate, e.g. NaCl-quinine, sucrose-quinine. A large number of taste (18 of 31) and mechanoreceptive (12 of 15) units examined had receptive fields (RFs) on the palate, and four taste and two mechanoreceptive units on the circumvallate area. This contrasts with the findings in the intact rat. Some taste (n = 1) and mechanoreceptive units (n = 2) had large RFs. Taste units with different RF locations showed different taste profiles. Acute i.v. injection of amobarbital sodium affected only the response magnitude of taste units, suggesting that most of the differences between intact and decerebrate rats might be caused by decerebration. The present findings indicate that neural structures above the pre- or midcollicular level have tonic inhibitory or facilitatory effects on the response properties of NTS taste units.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00235918
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  • 2
    Digitale Medien
    Digitale Medien
    Receptive field properties of the parabrachio-thalamic taste and mechanoreceptive neurons in rats (1987)
    Springer
    Experimental brain research 68 (1987), S. 458-465 
    Details
    ISSN: 1432-1106
    Schlagwort(e): Parabrachio-thalamic relay neurons ; Parabrachial nucleus ; Taste ; Mechanoreception ; Receptive field ; Oral cavity ; Rat
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Receptive fields (RFs) of 36 taste (the 22 parabrachio-thalamic relay (P-T) and 14 non-P-T) and 23 mechanoreceptive neurons (7 P-T and 16 non P-T) were located in the oral cavity of rats. All of the taste and most of the mechanoreceptive units examined had an RF on the ipsilateral side of the tongue or palate, but some mechanoreceptive P-T and non-P-T units had RFs bilaterally. When the RFs of taste neurons were examined with the most effective of the four basic taste (the best stimulus) and non-best stimuli, no difference was noticed in the location of RFs between the P-T and non-P-T neurons. Though most of the P-T neurons (7/11) and all of the non-P-T neurons (6/6) had an RF for non-best stimuli at a region similar to that for the best stimulus, some P-T neurons (4/11) had an RFs for non-best stimulus outside the RF for the best stimulus and/or on the region separate from the RF for the best stimulus. The P-T neurons, responding vigorously to non-optimal stimuli as well as to the best stimulus, had an RF outside the RF for the best stimulus. RFs for mechanical stimulation were also examined in some taste and mechanoreceptive neurons. The mechanoreceptive P-T units rarely had an RF exclusively on the palate. Some mechanoreceptive units had an RF on the region where no taste RF has been found, e.g. the intermolar eminence and the folium of the hard palate.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00249790
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  • 3
    Digitale Medien
    Digitale Medien
    Response properties of the parabrachio-thalamic taste and mechanoreceptive neurons in rats (1987)
    Springer
    Experimental brain research 68 (1987), S. 449-457 
    Details
    ISSN: 1432-1106
    Schlagwort(e): Parabrachial nucleus ; Parabrachiothalamic relay neurons ; Taste ; Mechanoreception ; Rats
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary A total of 66 taste and 33 mechanoreceptive neurons were isolated from the parabrachial nucleus (PB) of rats. Among them, 39 taste and 8 mechanoreceptive neurons were identified as parabrachio-thalamic relay (P-T) neurons on the basis of antidromic activation from either or both sides of the thalamic taste areas (TTAs). On average, the P-T taste neurons produced larger response magnitudes than the non-P-T taste neurons, and whereas about half the P-T taste neurons were NaCl-best, only a small number of the non-P-T taste neurons were NaCl-best. Both the P-T and non-P-T taste neurons showed a similar breadth of responsiveness to four basic taste stimuli. The response magnitudes of the P-T taste neurons to all taste stimuli were ca. 3 times larger than those of the solitario-parabrachial relay (SP) neurons (afferents to the PB); in particular, the response magnitudes of the NaCl-best P-T neurons were 4–5 times larger than those of the NaCl-best SP neurons. The response magnitudes and breadth of taste responsiveness of the P-T taste neurons were reciprocally correlated with the antidromic latencies from either side of the TTAs. A histological examination revealed that the P-T taste neurons in the ventral part of the PB had a shorter antidromic latency from the ipsilateral TTA than those in the dorsal part of the nucleus. Mechanoreceptive neurons were excited by stroking the tissue in the oral cavity or perioral tissue, or by pinching them with non-serrated forceps. The mechanoreceptive P-T neurons were also activated from either or both sides of the TTAs. No particular relation was noticed between the antidromic latency of the mechanoreceptive P-T neurons and their response properties or locations in the nucleus.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00249789
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  • 4
    Digitale Medien
    Digitale Medien
    Sliding of the wigner solid from the coupled plasmon-ripplon surface deformation (1995)
    Springer
    Journal of low temperature physics 101 (1995), S. 433-438 
    Details
    ISSN: 1573-7357
    Schlagwort(e): 73.20.Dx ; 67.40.Hf ; 73.50.Fq
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The Wigner solid (WS) on a liquid4He surface is accompanied with the periodic surface deformation, i.e. the ripplons whose wavevectors equal the reciprocal WS lattice vectors. This unique situation plays a crucial role in the dynamics of the WS. We have performed an extensive measurement of the ac Corbino conductivity σxx. The WS conductivity shows extremely nonlinear behavior, and it jumps abruptly at a certain input voltage. The threshold input voltage Vth varies as VthαB−0.8f−1ns 1.5E⊥, where B, f, ns, and E⊥ are magnetic field, frequency, electron density and pressing electric field, respectively. We have interpreted the σxx jump as the collective sliding of the electrons out of the surface deformation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00753333
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  • 5
    Digitale Medien
    Digitale Medien
    Surface study of liquid3He using surface state electrons (1995)
    Springer
    Journal of low temperature physics 101 (1995), S. 439-444 
    Details
    ISSN: 1573-7357
    Schlagwort(e): 73.20.Dx ; 67.55.-s
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We have measured the mobility of surface state electrons (SSE) on liquid3He, μ3, aiming to study the elementary surface excitations of the Fermi liquid. A gradual increase of μ3 below 300 mK is attributed to the scattering of electrons by ripplons. Ripplons do exist in3He down to 100 mK. We observe an abrupt decrease of μ3, due to the transition to the Wigner solid (WS). The dependences of the WS conductivity and mobility on temperature and magnetic field differ from the SSE behavior on liquid4He.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00753334
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