Natalia is washing her hands and adjusts the faucet handle until the water feels just slightly hotter than it did before. natalia's adjustment until she feels a difference is an example of

The scenario above depicts an example of difference threshold. This happens when an individual is likely to experience a noticeable change in which the difference is only at its minimum and the person has the capability of detecting it at fifty percent every time it happens. 

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intimacy, passion and commitment are the components of a interpersonal relationship emphasized in the triangular theory of love by robert sternberg.

the triangular theory of love says love can be comprehend as this componest form the vertices of a triangle.  

intimacy relates to feelings such as of closeness and connection;

passion relates the drives that brings people together, as physical attraction.

commitment relates to the being in a long-term relationship.