SU1666063A1 - Apparatus for study of physiological reactions - Google Patents

Abstract

A device for studying physiological reactions relates to medical technology and can be used in experimental psychology. The aim of the invention is to improve the accuracy of diagnosis of the physiological state of the object by simultaneously measuring the temporal parameters of the reaction of the organism. The device contains a current generator 1, electrodes 2, amplifier 3, subtraction unit 4, stimulus unit, memory unit 5, threshold element 6, reaction time measurement unit 7, RS trigger 8, element 9, meter 10 of the patent period. 1 il.

Description

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The invention relates to medical technology, in particular to devices for recording the galvanic skin response (GSR) according to Feret, and can be used in medical and experimental psychology.

The purpose of the invention is to improve the accuracy of diagnosing the physiological state of an object by simultaneously measuring the temporal parameters of an organism’s response,

The drawing shows the functional diagram of the device.

The device for detecting a galvanic skin response contains a current generator 1, the first and second outputs of which are connected respectively to the first and second electrodes 2 and the first and second inputs of amplifier 3, the output of which is connected to the first input of subtraction unit 4, an irritation unit (not shown) and a memory unit 5, the output of which is connected to the second input of the subtraction unit 4.

The device also contains a series-connected threshold element 6, a reaction time measurement unit 7, also connected in series RS-trigger 8, element 9 I, meter 10 of the latent period. The second input of element 9 I is connected to the output of the threshold element b and the R input of the RS flip-flop 8, the second output of which is connected to the first input of the memory unit 5, the second input of which is connected to the first input of the subtraction unit 4, the output of which is connected to the input of the threshold element 6, the stimulus block is connected to the S input of the RS flip-flop 8.

The device works as follows.

The electrodes 2 superimposed on the human skin are connected to the output of the current generator 1 and to the input of the amplifier 3, at the output of which a voltage appears that is proportional to the skin resistance URX. From the output of the amplifier 3, the voltage is applied to the input of the subtraction unit 4 (made, for example, according to the differential amplifier circuit) and to the information input of the memory unit 5, made, for example, according to the series-connected switch and storage capacitor. When the switch is open, the output voltage is applied to the storage capacitor and to the second input of the subtractor 4. Due to the fact that the same voltage is applied to both inputs of the subtraction unit 4, the voltage at its output is zero. At the time the external stimulus is applied, the trigger 8 (via the S input) is set to one. The key of the memory block 5 is closed and from this moment the voltage on the inputs of the subtraction unit 4 is supplied from the output of amplifier 3 and from the storage capacitor, the voltage of which was equal to the voltage at the output of amplifier 3 until the external stimulus was applied. At the output of the subtraction unit 4, a voltage appears equal to the voltage difference on

0 is output of amplifier 3 and at the output of memory block 5. From the output of subtraction unit 4, a voltage proportional to the resistance difference Rx-Ro is fed to a recorder (not shown) and to the input of the threshold element

5. The low voltage level from the second output of the RS flip-flop 8 (after irritation) and the low level from the output of the threshold element 6 arrive at the input of the element 9 AND, which is triggered and turns on the meter 10 of the latent period, which starts counting the duration of the latent period body reactions. At the time of comparing the voltage from the output of the subtraction unit 4 with the preset

5, the Unop value (usually Unop is set equal to the amount of noise at the output of amplifier 3 and its temperature drift) threshold element 6 transitions to the second steady state and a high potential at its output 0, which stops the meter of the latent period 10 and switches on the duration measuring unit 7 reaction, which starts counting the duration of the reaction time

5 external irritant. As the body's response dies out, the voltage at the output of subtraction unit 4 decreases and when it becomes less Unop, threshold element 6 is reset, turns off block 7 and sets trigger 8 to reset. When another stimulus is applied, the measurement process is repeated.

The device allows to more accurately determine the amount of skin resistance change (Rx-Ro) due to the fact that the resistance value RO corresponding to the state of rest is determined directly at the time of the experiment, i.e. at

0 moment of exposure to irritant. Due to the fact that using the trigger captures the moment of exposure to the irritant, it is possible to measure the latent period and the duration of the reaction time of the body.

5 to an external stimulus, which can be used to more accurately judge the state of the vegetative nervous system and indirectly about the functional relationships in the cerebral cortex, i.e. about the physiological and psychophysiological state of the organism.

Claims (1)

Claims An apparatus for examining physiological reactions comprising a current generator, the first and second outputs of which are connected respectively to the first and second electrodes and the first and second inputs of the amplifier, the output of which is connected to the first input of the subtraction unit, the irritation unit and the memory block whose output is connected to the second input of the subtraction unit, characterized in that, in order to improve the accuracy of diagnosis of the physiological state of the object by one five temporal measurement of the temporal parameters of the reaction of the organism, a serially connected threshold element and a reaction duration measurement unit, also connected in series, an RS trigger, element I, a latent period meter, a second input of the AND terminal and the R input are entered into it RS-flip-flop, the second output of which is connected to the first input of the memory unit, the second input of which is connected to the first input of the subtraction unit, the output of which is connected to the input of the threshold element, the stimulus connecting block n to S-input RS-flip-flop.