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COMPUTER ANALYSIS OF SINGLE-UNIT DISCHARGES IN THE VESTIBULAR NERVE OF THE FROG
Pages 137-144

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From page 137...
... Their applicability to the study of vestibular units during spontaneous and provoked activity is discussed. A computer window technique that analyzes the frequency, the shortest interval, the longest interval, and standard deviation is described.
From page 138...
... An Ampex analog magnetic tape recorded the activity of the unit under consideration, a fiducial mark that determined the beginning of a sequence, a time mark in real time, the frog's electrocardiogram, and the values expressed on the accelerometers. The computer processing was divided into three steps: digitation of analog data, which for EXPERIMENTAL ARRANGEMENT IN VESTIBULAR LABORATORY [M TILTHS AND ROTATIK TAKE - CLIPPED 1 -- EMITTER FOLLOIER AMPLIFIER ^ EVEHT MARKER r ACttLEMIETERS i Ft ^ 1 AUDIO •*
From page 139...
... > E 60 40 i ao wo TO iwo mo eco ir» woo ii IE M in son cs ix in TO o 20 0 EVENT MARKER • a at K m vi M i u n i H o n ii UPPER LIMITS OF SPIKE INTERVALS, msec FIGURE 2. -- Interval histograms of spontaneous activity of a frog vestibular unit using four different bounds.
From page 140...
... The second procedure to be considered here involves the use of an arbitrary time window and observation of the behavior of the spike intervals during these time limits. As the angular acceleratory forces that were used in our experiments lasted for about 2 seconds, 2-second windows were selected to study neuronal activity.
From page 141...
... The values for each window, maximum interval, mean interval, standard deviation, and minimum interval, are plotted for each time period. The plot for spontaneous activity obtained in this manner shows how these four values remain within a limited range, and fluctuation of maximum and minimum intervals occurs proportionately without disorderly dispersion or conversion.
From page 142...
... EVENT MARKER VESTIBULAR UNIT EKG Z AXIS Y AXIS TIME CODE -- -- EVENT MARKER VESTIBULAR UNIT EKG Z AXIS Y AXIS TIME CODE FIGURE 9. -- Response of a vestibular nerve unit to linear acceleration.
From page 143...
... The shifts that we found in the values for the maximum interval, minimum interval, and standard deviation suggest that peripheral and/or central biasing mechanisms must exist, of which the dynamic range of the spontaneous discharge is an expression. This mechanism must involve a regulatory system that inhibits or releases the first-order neuron from its influence according to a pattern of information.
From page 144...
... Did you try to correlate the shortest spike intervals measured in a single unit during constant stimuli of various magnitude with the stimulus intensity; that is, did you try to get a stimulus-response relationship? Huertas: Do you mean did I correlate the stimulus with the minimum interval only?


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