## 4 Results  
### Maximum Head Angle Deviation  
The maximum head angle deviation is illustrated across ten days, contrasting the states preceding feedback, concurrent with feedback, and subsequent to feedback in the VF group and three sessions without visual feedback in the control group as it shown in Figure 5.  
Additionally, to provide a better picture for comparison of the two groups, the results are illustrated in Figure 6. The figure provides a comparative visualization of the maximum head angle deviation between the two groups on different days. Similarly, the two groups are illustrated on Figure 7 to compare sessions within groups. An analysis of variance (ANOVA) conducted on the maximum head angle deviation revealed a significant effect of the Day because of the higher values on day 1 compared to the other days (F(9,252) = 11.33, \(p\) < 0.001, \(np^{2}\)= 0.288, Session (F(2,56) = 46.47, \(p\) < 0.001, \(np^{2}\) = 0.624) because of the higher values on session 1 compared to sessions 2 and 3 as well as of the Group because of the lower values in the VF group compared to the control group (F(1,28) = 88.42, \(p\) < 0.001, \(np^{2}\) = 0.759). Moreover, the Day \(\times\) Session \(\times\) Group interaction was significant (F(18,504) = 3.06, \(p\) < 0.001, \(np^{2}\) = 0.098). As shown in Table 3, post hoc analysis revealed a significant difference between the VF and control groups on each day during sessions 2 and 3 as well as on days after the third during session 1 (\(p<0.009\), [PERSON]'s d \(>0.73\); Figure 6). Only on days 1 and 2 was there no difference between groups during session 1 (\(p>0.066\)). It can be confirmed that the visual feedback has a strong effect on decreasing the values and that this effect was consolidated across days. Moreover, the results confirm that in the VF group there was a significant reduction in sessions 2 and 3 compared to session 1 on days 1 to 5 (\(p<0.046\), [PERSON]'s d \(>0.67\)). Instead, on days 6 and after, there was no difference between the three sessions in the VF group (\(p>0.141\)). In the control group, there was no difference between sessions on each day (\(p>0.848\)). \begin{table}
\begin{tabular}{l l l l l l l} \hline
**Day** & \multicolumn{3}{c}{**VF Group**} & \multicolumn{3}{c}{**Control Group**} \\  & **Session 1** & **Session 2** & **Session 3** & **Session 1** & **Session 2** & **Session 3** \\ \hline
1 & \(28.11\pm 2.76\) & \(15.57\pm 3.02\) & \(16.56\pm 3.30\) & \(28.97\pm 3.36\) & \(27.39\pm 2.78\) & \(27.72\pm 3.56\) \\
2 & \(23.57\pm 4.16\) & \(13.30\pm 2.51\) & \(13.79\pm 3.02\) & \(27.86\pm 3.04\) & \(28.54\pm 2.99\) & \(28.20\pm 3.52\) \\
3 & \(21.77\pm 3.60\) & \(10.57\pm 2.07\) & \(12.85\pm 1.68\) & \(28.40\pm 3.12\) & \(28.01\pm 2.74\) & \(28.54\pm 3.04\) \\
4 & \(17.99\pm 4.25\) & \(11.71\pm 3.14\) & \(9.89\pm 2.29\) & \(28.42\pm 2.99\) & \(28.56\pm 2.88\) & \(27.68\pm 2.80\) \\
5 & \(14.41\pm 1.80\) & \(13.20\pm 3.28\) & \(11.38\pm 2.29\) & \(27.69\pm 3.34\) & \(27.90\pm 2.78\) & \(29.27\pm 2.83\) \\
6 & \(15.60\pm 3.04\) & \(11.55\pm 3.19\) & \(11.26\pm 1.74\) & \(28.24\pm 3.21\) & \(27.60\pm 3.14\) & \(28.15\pm 2.82\) \\
7 & \(14.91\pm 3.49\) & \(11.38\pm 3.30\) & \(13.34\pm 2.69\) & \(29.08\pm 2.91\) & \(27.26\pm 2.96\) & \(27.46\pm 3.70\) \\
8 & \(13.73\pm 2.29\) & \(12.64\pm 2.26\) & \(11.12\pm 2.81\) & \(28.60\pm 2.74\) & \(28.66\pm 3.28\) & \(27.44\pm 2.91\) \\ \hline \end{tabular}
\end{table} 
Table 3: Maximum angular deviation of the head. The data for the VF and control groups are presented over a ten-day period. The data are represented in three sessions (Sess. 1, Sess. 2, and Sess. 3). The values are expressed as mean values \(\pm\) standard errors. Figure 5: Maximum angular deviation of the head. The data for the VF and control groups are presented over a ten-day period. The data are represented in three sessions: Sess. 1, Sess. 2, and Sess. 3. The values are expressed as mean values with corresponding standard errors.