## 3 Results
### Optimal Imaging Stimulant Results

Table 1: _Cont._

Figure 3: Scatter plots showing optimized video stimulus values for speed, distance, and size from left to right. indicates that distances between 1300 and 1500 px yield the highest effectiveness, beyond which a plateau or slight decline emerges. Similarly, the right plot reveals that increasing the circle size up to around 70-90 substantially elevates the effectiveness score. These findings highlight a sweet spot for each parameter, pointing to a balance between insufficient stimulus intensity and potential oversaturation. Clinically, tuning speed, distance, and circle size within these ranges could enhance EMDR outcomes by aligning stimuli with the observed optimal intervals. Taken together, these three plots reveal distinct sweet spots for speed, distance, and circle size. By tuning these parameters within their respective optimal ranges, clinicians or researchers could potentially enhance therapy outcomes in EMDR or other visual stimulus-based interventions. These configurations suggest that specific stimulus parameters can optimize eye movement and cognitive processing during EMDR treatment. ### EEG Measurement

A field test was conducted with 56 EMDR participants, 16 of whom met the criteria for depression according to the CES-D questionnaire. EMDR video stimuli were generated based on the highest (PES 1) and lowest (PES 50) values among the top 50 PES predictions. Two video clips were prepared for each participant: one with a 1.8 Hz speed, 1440 px distance, and 70 px size, and the other with a 1.3 Hz speed, 1150 px distance, and 35 px size, each lasting 60 s for a total of 120 s. All participants were treated by the principal investigator and research assistants under the same environmental conditions and IRB standards to ensure experimental safety and strict evaluation methods. In our viewing angle calculations, 19.05 cm was the stimulus's diameter, whereas 60 cm was the distance between the observer and stimulus. The viewing angles for the videos were calculated using the arctangent function. For case 1, with a 1.8 Hz speed, the viewing angle was approximately 35.22\({}^{\circ}\), and for case 2, with a 1.3 Hz speed, it was approximately 28.84\({}^{\circ}\). \[\theta_{1}=2\times\arctan\biggl{(}\frac{19.05}{60}\biggr{)}\approx 35.22^{\circ} \tag{6}\]

\[\theta_{2}=2\times\arctan\biggl{(}\frac{15.215}{60}\biggr{)}\approx 28.84^{\circ} \tag{7}\]

Table 2 summarizes the field of view and round-trip counts for each case. The EMDR video stimulus was produced using Adobe After Effects (v.23) and saved as an h.264 mp4 file. EEG measurements of frontal beta wave activity were conducted in eye-open (EO) and eye-close (EC) conditions. The results, presented in Table 3, show the frontal lobe beta wave activity over 120 s trials, with participants alternating between EO and EC blocks. Relative intensity values of the right frontal lobe beta waves were recorded in percentage terms, comparing PES 1 and PES 50. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{2}{*}{**No.**} & \multicolumn{3}{c}{**Production Standards**} & \multicolumn{1}{c}{**Field of View**} & \multicolumn{1}{c}{**Total Round Trips**} \\ \cline{2-6}  & **Speed** & **Distance** & **Size** & **Angle** & **(Based on 120 s)** \\ \hline
1 & 1.8 Hz & 1440 px & 70 px & 35.22 & 216 (555 ms) \\ \hline
2 & 1.3 Hz & 1150 px & 35 px & 28.84 & 156 (769 ms) \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Field of view and total number of round trips for each case.