Some vocalizations of domestic cats, such as purring, are well-known to be produced in situations of positive valence, such as mother kitten interactions, contacts with familiar partner, or during tactile stimulation with inanimate objects as when rolling and rubbing.
12.
The term " Berlusconismo " arose in the 1980s, characterized by a strongly positive valence, as a synonym for " entrepreneurial optimism ", that is, as an entrepreneurial spirit which does not get upset from difficulties, and trusts that problems can be solved.
13.
In general, for a given chemical element ( as sulfur ) Abegg s rule states that the sum of the absolute value of its negative valence ( such as " 2 for sulfur in " H 2 S " ) and its positive valence of maximum value ( as + 6 for sulfur in " H 2 SO 4 " ) is often equal to 8.
