**4.3 Experimental results of experiment 3**

## *4.3.1 Results of the ability to follow the emitting sound*

In the third experiment, we recorded the success or failure of following the sequences of the emitting sound and time required to follow the sound from the start and end points. The following three experimental factors were considered in this experiment: the type of sound source (voice and swept-sound), type of loudspeaker (capacitor-flat and dynamic ones), and complexity of the sequence that was defined from one to five by the number of turning points.

The mean values of the time required to follow a sequence and the success rate for each factor are shown in the **Figures 10–12**. A three-way ANOVA within-subject was used to estimate how the means of the success rates and the required times changed according to the levels of three factors as mentioned above. No significant differences were observed in the success rates for all main factors and their interaction. In the result with respect to the required time, there was no significant difference in the type of sound source (*p* = 0.457), but there was a significant difference in the type of

**Figure 10.**

*Mean values of the time required to follow a sequence and the success rate for sound sources.*

#### **Figure 11.**

*Mean values of the time required to follow a sequence and the success rate for loudspeaker types.*

#### **Figure 12.**

*Five-level Bonferroni's multiple comparison of the complexity of the emitting patterns.*

loudspeaker (*p* = 0.0415) and the complexity of the emitting pattern (*p* = 0.0013). **Figure 12** shows that, a five-level Bonferroni's multiple comparison of the complexity of the emitting pattern showed a significant difference.
