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Developing a biofeedback augmented-reality mobile game using photoplethysmography
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Resumo(s)
The human nervous system is responsible for coordinating the entire organism’s actions and
sensory information. It can be divided into the CNS and the PNS. The PNS can be further divided
into the SMS and the ANS.
The sympathetic and parasympathetic divisions of the ANS are opposed to each other: the
sympathetic division is responsible for fight or flight responses while the parasympathetic
division is activated when the body is relaxed.
Stress is defined as an organism’s response to an outside stimulus defined as a stressor. Stressors
can be environmental changes or the presence of threats, either real or perceived as such.
Stressful situations provoke an increase in heart rate, which is a measure of how many times the
heart contracts in a time period (usually it is presented in beats per minute).
Heart rate variability is another marker that can be used to determine a person’s stress levels. High
HRV is associated with calm decision making while low HRV is associated with snap decisions
and emergency responses.
Biofeedback is either the process through which a person can learn to control unconscious
activities or the process of making devices react to the user’s physiological processes.
Photoplethysmography is a non-invasive technique through which changes in the circulating
blood volume are detected using reflected light. PPG allows the monitorization of heart rate.
This project combines PPG and biofeedback computer programming to create an augmented
reality mobile horror game that reacts to the player’s HR and HRV.
The final game was tested on five subjects that played the game twice and gave their opinions on
the user experience. Statistical tests were also conducted to ascertain if the game provoked notable
differences in HR and HRV.
Results show that the game’s user experience was positive, but it failed, in most cases, in altering
the player’s mean HR and HRV in a statistically significant way.
Nevertheless, the game did react to momentary changes in HR and HRV, accomplishing what it
set out to do initially.
Descrição
Tese de mestrado integrado, Engenharia Biomédica e Biofísica (Engenharia Clínica e Instrumentação Médica), 2022, Universidade de Lisboa, Faculdade de Ciências
Palavras-chave
Ritmo cardíaco Variabilidade do ritmo cardíaco Biofeedback Realidade aumentada Jogo móvel Teses de mestrado - 2023