## 2 Related Works  
Biofeedback, in its canonical manifestation, emerges as a therapeutic method underpinned by the sophisticated apparatus of modern electronics, serving as a conduit for the comprehensive measurement and intricate analysis of the multifarious neural, muscular, and autonomic processes inherent to the human corpus [16]. These invaluable insights gleaned from the depths of biofeedback instrumentation are subsequently imparted to the patient and their medical practitioner(s) through the medium of auditory or visual feedback, culminating in a symbiotic dyad of informed collaboration [17; 18; 19]. For patients, the biofeedback apparatus functions as a quasi-sensorial adjunct, affording them the rarefied capacity to perceive and cognize the inner workings of their corporeal vessel [20]. In a notable example, someone using a blood pressure monitor can actually lower their own blood pressure by simply concentrating on the screen [21]. When acquiring skills such as biking, driving, or sports, this unspoken skill of blood pressure control combines mental and physical aspects. It is developed through trial and error, hands-on learning, and dedicated practice [22]. Biofeedback equipment translates physiological signals into audio-visual feedback, aiding in the treatment of various conditions including neurological and muscular issues, tension-related problems, and gastrointestinal disorders [23]. These devices are temporary tools for learning and experimentation, becoming unnecessary when proficiency is attained. Biofeedback is particularly effective in cases where pharmaceutical interventions fall short [24]. A recent paper [25] introduced a biofeedback system using an accelerometer. In a five-hour study with six participants, the authors found that the system significantly reduced time spent in poor posture. The biofeedback system interfaced with a computer and provided real-time feedback on the user's neck angle through a visual display and auditory cues. While initial sessions recorded neck movements without feedback, subsequent sessions with active biofeedback showed improved posture. It is worth noting that continuous use of the biofeedback system was required in order to maintain good posture, and there was no information on lasting effects after the study. In [26], researchers introduced an innovative biofeedback system with a camera on a computer monitor, auditory cues, and a tactile feedback necklace. Participants read on their computers with the option of using auditory or tactile feedback. Results showed improved neck angles with both feedback methods, and there was a significant change in neck angle even without feedback. While this study demonstrated the rapid effectiveness of biofeedback within a single 90-min session, the long-term benefits remain uncertain. In [27], the authors suggested that individuals can learn to improve their head and neck posture through the use of a biofeedback system. The system continuously monitors head and neck alignment, providing real-time feedback through a smartphone app. It uses signals such as sounds, music, vibrations, and flashes to warn users about poor posture. Data collected are securely stored and can be shared with healthcare professionals; however, the device does not quantify the extent of posture improvement, highlighting the need for web services to access comprehensive data. In another study, [28] used neurofeedback to improve neck posture in individuals with forward head syndrome. Participants were split into two groups, one receiving neurofeedback training and the other acting as a control. Both groups underwent a four-week, thrice-weekly program that included unique activities such as pottery and brainwave-controlled archery to enhance concentration. After the training, the neurofeedback group showed significant improvements in neck mobility, as documented through post-training assessments. In [29], a study was conducted in which participants performed a one-hour typing task twice, once with biofeedback and once without.