## Materials and Methods
### Preparation of Sensor  
The sensors were fabricated using a modified methodology presented in [32]. A base suspension with 1% \(w/w\) cellulose was prepared by dispersing cellulose pulp in deionized water using a high shear rate mixer Micra D9 (Micra,uggingen, Germany) for 30 min. The dispersion was then sonicated using an ultrasonic mixer (Sonics VCX-750, Newtown,CT, USA) for 30 min at an oscillation amplitude of 65%. A measured volume of the CP suspension (20 mL) was mixed with a previously synthesized AgNWs dispersion at a concentration of 0.043 g\({}_{\text{AgNWs}}\)/mL, sonicated for 3 min, and then separated from the host liquid using a vacuum filtration set on a 47 mm diameter hydrophilic PTFE filter with a pore diameter of 0.45 \(\upmu\)m (Merck Millipore, Burlington, MA, USA). After the initial dehydration, the whole material was dried in a laboratory dryer at 80 \({}^{\circ}\)C for 24 h. The material obtained was then compressed under a load of approximately 10,000 kg at room temperature. This procedure unifies and strengthens the structure of the manufactured raw hybrid paper and significantly improves the sensor's electrical conductivity. Subsequently, strips of copper sheets were glued to the sensor using a silver-based electrically conductive adhesive, and a 0.1 mm insulated copper wire connected to banana plugs was soldered. The stability and reliability of these connections are critical to the accuracy and reproducibility of the test results. To avoid the potential effects of moisture on the measurement results and to increase the mechanical strength, the sensor was coated with PDMS resin with a crosslinking agent added beforehand. The entire assembly was cured at 65 \({}^{\circ}\)C for 24 h. Covering the sensor with resin is particularly important when working in contact with the human body or monitoring respiratory activity. The insulation prevents the influence of sweat or high moisture content in exhaled air on the test item's readings and functioning. Other authors have shown that temperature changes can also affect the results obtained with sensors of a similar design [32]. However, given the relatively small range of variations in human body temperature, this effect can be neglected, especially when high-precision readings are not required. The sensors used in this study had a silver nanowire content of (#1) 0.325 g\({}_{\text{AgNWs}}\)/g\({}_{\text{CP}}\), (#2) 0.182 g\({}_{\text{AgNWs}}\)/g\({}_{\text{CP}}\), (#3) 0.092 g\({}_{\text{AgNWs}}\)/g\({}_{\text{CP}}\), and (#4) 0.645 g\({}_{\text{AgNWs}}\)/g\({}_{\text{CP}}\). For sample #5 containing 0.325 g\({}_{\text{AgNWs}}\)/g\({}_{\text{CP}}\), 0.02 g of carbon nanotubes was added during the slurry formation stage, resulting in a concentration of approximately 0.1 g\({}_{\text{CNTs}}\)/g\({}_{\text{CP}}\). Five samples were prepared according to the procedure described. Each was used twice. Examples are shown in Figure 1. For the tests involving mechanical interactions, such as applying a weight, tapping the surface with a finger and magnetic field interactions, untreated sensors were used, as shown in Figure 1a. The form shown is, however, inconvenient for experiments involving human participation. Therefore, after the appropriate trimming and combining with medical plaster, the sensors, as shown in Figure 1b, were used to study human reflexes (swallowing, speaking words, twisting the neck, bending the finger) and imaging damped vibrations. It is worth mentioning that the shape modification used did not significantly affect the functional properties of the sensors tested. Figure 1c shows the selected sensor in an electric circuit with an LED and DC supply. Figure 2 shows SEM images of the components used in the construction of the sensors and a cross-section of the selected item. Figure 2a illustrates the cellulose pulp sample used in the study with an average diameter of 20-50 \(\upmu\)m. The silver nanowires applied in the study are shown in Figure 2b.