## 3 Results and Discussion  
### Experimental Results  
Table 1 summarizes the data that were collected during the experiment. Twenty participants (P1-P26) took part in the experiment, of which thirteen were women and seven were men (Table 1). Since some participants had trouble logging in to their Mindstretch account, a second Mindstretch account was made for those participants. Therefore, the participants' names in Table 1 go up to P26. The average age of the participants was \(24\pm 7\) years. From one participant (P3), no data were collected, so only nineteen participants were considered in the analysis. Another participant (P23) only labelled one emotion, so the data of this participant were not suitable for classification. So finally, the results of eighteen participants were analysed. \begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Participant** & **Gender** & **Age** & **Number of Labelled Events** & **Number of Emotions** \\ \hline P1 & F & 25 & 17 & 7 \\ P2 & F & 22 & 86 & 13 \\ P3 & F & 22 & 0 & 0 \\ P4 & M & 23 & 17 & 6 \\ P5 & M & 51 & 99 & 10 \\ P6 & F & 22 & 76 & 9 \\ P7 & F & 22 & 21 & 4 \\ P8 & F & 22 & 100 & 11 \\ P10 & F & 22 & 42 & 8 \\ P11 & F & 18 & 583 & 11 \\ P13 & F & 26 & 60 & 14 \\ P15 & F & 26 & 9 & 5 \\ P16 & F & 23 & 13 & 5 \\ P17 & F & 22 & 9 & 5 \\ P18 & M & 24 & 7 & 6 \\ P22 & M & 23 & 23 & 7 \\ P23 & M & 21 & 2 & 1 \\ P24 & F & 22 & 19 & 4 \\ P25 & M & 24 & 75 & 9 \\ P26 & M & 22 & 61 & 10 \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Summary of the collected data. Twenty participants (P1–P26) took part in the experiment. For each participant, the gender and age are given in columns two and three, respectively. The number of labels added by each participant is given in the fourth column. The last column shows how many different emotions were labelled by each participant. Table 2 summarizes the number of times that each emotion was labelled by every participant participant. Figure 5 illustrates the labelled data of participant P13. Every individual plot represents the labelled events of one specific emotion over time and each colour represents a different labelled event of that specific emotion. The dotted lines in the graphs, right before and after the markers, with each time the same duration as the emotion itself, represent the mental HR response just before and after the emotion occurred and give information about the rise and fade out of the emotion. The total length of each graph corresponds with the step input of the models. The \(y\)-axis stands for the pre-processed mental HR component in beats per minute (bpm) and the \(x\)-axis gives the time in seconds (s). When the mental HR responses of the same emotion for different events are compared to each other, such as for example the 'anger' events of participant P13, it is clear that the mental HR dynamics are highly variable in relation to the emotions at an individual level. This might indicate that contextual information about the circumstances in which an individual is experiencing the emotion is a key aspect, and that the mental HR response to a certain emotion of a specific individual can change over time. Thus, trying to assess the emotional aspect of the mental HR response in real-life conditions seems more challenging than in laboratory-controlled conditions. The context in which emotions take place, for example, whether the person is alone or with friends, or whether the person was expecting it or not, might play a larger role than expected from previous controlled lab conditions. Moreover, some habits of a person, such as drinking, smoking and drug intake might be important factors to take into account when monitoring emotions. When the mental HR responses of participant P2 are considered (Figure 6), there are some remarkable differences with participant P13. The responses of'sadness' for example, were decreasing curves for participant P13, while they were increasing for participant P2.