von Tanja Martens-Mantai
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| [1.] Tmm/Fragment 015 01 - Diskussion Zuletzt bearbeitet: 2014-04-28 15:49:22 Schumann | Fragment, Gesichtet, Granz 2009, SMWFragment, Schutzlevel sysop, Tmm, Verschleierung |
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| Untersuchte Arbeit: Seite: 15, Zeilen: 1-18 |
Quelle: Granz 2009 Seite(n): 16, 17, Zeilen: 16: 20ff - 17: 1ff |
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| Cortical SD-like events were evaluated with respect to their amplitude, duration and velocity rates. SD duration was defined as the interval between the time of half-maximal voltage shift during onset and recovery of the negative DC potential deflection.
Long-term potentiation Single pulses of electrical stimulation were applied through a bipolar platinum electrode attached to the white matter perpendicular to the recording electrode in the entorhinal cortex. Evoked field excitatory postsynaptic potentials (fEPSP) were recorded in the third layer of the entorhinal cortex. The fEPSP was elicited by adjusting the intensity of stimulation to ~50% of that at which population spikes after fEPSP began to appear. The amplitude of fEPSP 1 ms after the onset was measured for data analysis. In longterm potentiation (LTP) experiments, the cortex was sequentially stimulated once every minute. Ten trains of four pulses (pulse duration 0.1 msec; interpulse interval 50 msec; intensity 5 V) were repeated at intervals of 10 msec. LTP was operationally defined as the mean change in fEPSP amplitude in response to five stimuli given 30 min after tetanic stimulation compared with the mean response to five test pulses applied immediately before the stimulation. Thus % potentiation = [(posttetanus amplitude of fEPSP/baseline amplitude of fEPSP) 1] 100. Tetanic stimulation was applied 60 min after application of drug. |
Cortical SD-like events were evaluated with respect to their amplitude, duration and velocity rates. SD duration was defined as the interval between the time of half-maximal voltage shift during onset and recovery of the negative DC potential deflection.
3. Long-term potentiation Single pulses of electrical stimulation were applied through a bipolar platinum electrode attached to the white matter perpendicular to the recording electrodes. Evoked field excitatory postsynaptic potentials (fEPSP) were recorded in the third layer of neocortical slices. The fEPSP was elicited by adjusting the intensity of stimulation to ~50% of that at which population spikes after fEPSP began [page 17] to appear. The amplitude of fEPSP 1 ms after the onset was measured for data analysis. In long-term potentiation (LTP) experiments, the cortex was sequentially stimulated once every minute. Ten trains of four pulses (pulse duration 0.1 msec; interpulse interval 50 msec; intensity 5 V) were repeated at intervals of 10 msec. LTP was operationally defined as the mean change in fEPSP amplitude in response to five stimuli given 30 min after tetanic stimulation compared with the mean response to five test pulses applied immediately before the stimulation. Thus % potentiation = [(posttetanus amplitude of fEPSP/baseline amplitude of fEPSP) 1] 100. Tetanic stimulation was applied 60 min after application of drug. |
The source is not mentioned. |
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Letzte Bearbeitung dieser Seite: durch Benutzer:Schumann, Zeitstempel: 20140428155844