1.2.5. Temperature-Depth Cross-Modality

Some studies have researched color-concept or color-emotion association. For example, some previous research examined existing beliefs, either subconscious or conscious, about color through color-emotion association by means of an adjective list [13]. Their test consisted of a list of 30 adjectives, randomly ordered, so the users could associate any of the adjectives with any of the colors that were given to them.

While some temperature-concept association research exists, there has not been similar adjective list approaches for inferring the emotional and conceptual responses of the users towards temperature. The existing research focuses on cases such as exploring heat as an expression medium when focusing on interpersonal communication [14] or mapping temperature to the dimensional models of emotion by ratings along valence and arousal dimensions, based in Russell's circumflex model [15].

However, even with these few pieces of research and approaches about temperature and the conceptual and emotional association that arises from it, there are some results that give a hint about the fact that cold temperatures and warm temperatures are interpreted subjectively as a feeling of remoteness or nearness, respectively. In [16], tests for figuring out subjective interpretations of thermal stimuli in three di fferent scenarios (social media activity, colleague's presence, and the extent of use of digital content) were performed. The results showed both that there was a strong degree of agreemen<sup>t</sup> among participants about what temperature conveyed and that warm temperatures conveyed the presence of a colleague while cool temperatures conveyed absence.

In this work we continue researching in that direction by performing some tests to find out whether users find any correlation between temperature and depth (near–far). These tests, which were performed before the temperature-depth mapping design, are shown in the following section. The results were the basis for the final temperature-depth mapping algorithm.

### **2. Materials and Methods**
