Measuring the reaction time of test subjects to random-timed stimuli is a standard clinical procedure in many settings. Modern instrumentation makes this a simple task—far more sophisticated than the “carnival” units of the 1950s (Fig. 1)—and can produce highly accurate time-data for further analysis. But setting up the test arrangement takes time while its “institutional” look can affect user comfort and thus skew results.
1. This carnival reaction-time tester was the forerunner of more sophisticated electronic units. (Image credit: Worthpoint)
Now, a team at the Nation Institutes of Health (NIH) is investigating use of standard smartphones to perform the same tests. The idea is to send a text message to the test subject’s own phone and time how long it takes for them to respond, using the phone as the timer. A simple app downloaded to the phone will measure the responses and report the raw data for additional analysis (Fig. 2).
2. The smartphone-based reaction-time app provides raw data that can then be analyzed and graphed in various formats, including the basic histogram. (Image credit: Semantic Scholar)
According to the project leader, people are amazingly speedy when it comes to responding to text message alerts. They can’t resist picking up the phone immediately to check. In fact, he noted that there are documented cases of individuals who were comatose yet woke up upon hearing their phone ping. In some cases, the patients even picked up their phone to answer the text message as they “snapped” out of their comatose state. An NIH spokesperson mused, not entirely in jest, “Who knows, it might even become an Olympic event in a few years?”
Use of the system based on smartphones may eliminate the need for hobbyist DIY reaction-time test circuits, such as the one built with the classic 555 timer and a few small-scale digital ICs (Fig. 3).
3. A basic reaction-time circuit with a readout of 10 LEDs is analogous to the carnival version and doesn’t even require a microcontroller. (Image credit: Electroschematics)
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