Table 1 Kinematic parameters extracted from SensRing

IAV

Integral of the magnitude of the acceleration vector: it represents a value correlated to the energy expenditure (m/s)

RG, AG

Vpeak

Maximum value of the amplitude of the peak velocity (m/s) calculated from the integration of the magnitude acceleration vector

RG, AG

T_Vpeak

Time of peak velocity: it is the time instant corresponding to the peak velocity (s)

RG, AG

T_decel

Deceleration time: it is the duration of the deceleration phase (s)

RG, AG

Decel%

Deceleration time (%): it represents the percentage of the deceleration phase compared to the total execution time

RG, AG

T_exec

Execution time: it represents the time spent to perform the movement (s)

RG, AG

T_react

Reaction time: it is the time elapsed from the start acoustic input to the beginning of the movement (s)

RG

Index_exc

Amplitude of maximum index finger excursion: it indicates the angular excursion of the index finger during the grasping of the object (deg). It is a measure related to the hand opening but estimated by using the index finger

RG

T_index_exc

Time of maximum index finger excursion: it is the time instant corresponding to the maximum excursion of the index finger during the grasping action (s)

RG

Skew

Skewness: it is a measure of the asymmetry of the distribution. It is calculated from the magnitude of the acceleration vector

RG, AG

Kurt

Kurtosis: it is a measure of the shape of the tail of the distribution. It is calculated from the magnitude of the acceleration vector

RG, AG

rmseJerk

Root mean square of the jerk, that is the rate of change of the acceleration: it represents the smoothness of the movement (m/s³)

RG, AG