Many human-environmental models were proposed by researchers of environmental psychology and surrounding fields, in order to deepen the understanding. Proposal of those models often defines and differentiate similar conditions and/or expand the usage of the former proposed model. For example, Kuno et al proposed two-dimensional thermal sensation model that introduced surrounding environmental index axis and thermal physiological index model, which differentiated “hot” to “warm” and “comfort” to “pleasant”. Likely, model of two turning points introduced by Hirate et al differentiated the type of decision, namely one turning point and two turning points. One turning point is where decision only changes once, like good / bad. Two turning points was where decision changes twice, like bad / good / bad, which indicates the adequate range. In addition, this model was developed from model proposed by Thustone, which adapted the model to experiments done by pairwise comparison method. Hirate et al not only introduced the model with two turning points as an expansion of the model, but also developed the model to explaining the experimental results of semantic differential method.
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