Recognition of changes in the psychophysiological state using the characteristics of the keyboard typing

Abstract

The search for methods to monitor the psychophysiological state without altering the condition or requiring expensive equipment remains highly relevant. This study aimed to investigate whether changes in keyboard dynamics can reflect psychological states. Two paradigms described in the literature—"fixed text" and "free text"—were used to register keyboard dynamics [Vizer et al., 2009]. Psychological testing included the assessment of emotional states, while electrocardiogram (ECG) and galvanic skin response (GSR) data were also recorded. Keyboard dynamics were evaluated before and after the induction of emotional stress. The results indicated that under stress, there were longer pauses between keystrokes, as well as an increased number of errors and corrections in the text. A relationship was found between the average duration of intervals, the number of pauses, typing speed, and anxiety levels. These findings suggest that changes in individual keyboard dynamics depend on the initial state of the subjects and their psychological characteristics. Therefore, to effectively recognize stress, it is necessary to construct individual models based on these parameters. Recording keystroke dynamics could be used for the long-term monitoring of the psychophysiological state of individuals whose work involves daily use of a computer, such as during long-term isolation experiments and scientific expeditions.