Daltometer for determining the reaction time to light stimuli. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Beginner radio amateur
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The device was developed by Yegor Belov and Aleksey Khindikainen. It is designed to determine the reaction time of a person to light stimuli of various colors. The time spent from the moment the stimulus signal appears to the response decision is called the human reaction. The smaller it is, the better the response.
Each person reacts to different light stimuli in different ways. In the normal state, this time is stable. At the slightest deviation in the psyche, the reaction changes. Therefore, the device can be useful in selecting people for extreme working conditions, selecting athletes before competitions, and determining the degree of schoolchildren's fatigue from mental or physical labor.
The device (Fig. 14) includes a time relay on transistors VT1, VT2, a key on a trinistor VS1, multi-colored indicator lamps HL1 - HL3 (for a voltage of 3,5 V and a current of 0,15 A) with a SA1 color switch, a current stabilizer on transistor VT3, bridge reaction rate meter on transistor VT4 and pointer indicator PA1 (full deflection current of the arrow 100 μA).
As soon as the subject presses the "Start" button SB1, holding it, the charging of the capacitor C1 through the resistors R1, R2 will begin. After some time, determined by the position of the variable resistor R1, the capacitor will charge so much that the trinistor opens, through which one of the lamps and the current stabilizer will be connected to the common wire. Simultaneously with the ignition of the lamp, capacitor C2 will begin to charge. The subject's task is to release the SB1 button as quickly as possible and press the SB3 "Res." button to see the result. In this case, the capacitor C1 is quickly discharged through the contacts of the buttons SB1 and SB2. The indicator hand will record the reaction time. After that, you can press the SB2 "Reset" button and bring the device to its original state. Capacitor C2 will be discharged through diode VD1, button contacts and lamp filament.
Before starting measurements, you must press the SB3 button and set the indicator arrow to zero with a variable resistor R7. If desired, by selecting the resistor R5, you can set the desired charging rate of the capacitor C2, which means the accuracy of measuring the reaction time.
The details of the device are mounted in a small case (Fig. 15), to which a control panel with buttons SB1 - SB3 is connected through a connector.
Author: L.Ponomarev, Tula
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