Ishin-denshin (以心伝心?) originally comes from a Chinese proverb  and is a Japanese idiom which denotes the traditional concept of interpersonal communication through unspoken mutual understanding. This four-character compound, known as a yojijukugo, literally translates as "what the mind thinks, the heart transmits." Sometimes explained in English in terms of "telepathy" or "sympathy", ishin-denshin is also commonly rendered as "heart-to-heart communication" or "tacit understanding." Ishin-denshin is present in every society on Earth in the way people look at each other and go through a variety of nonverbal gestures peculiar to their nationality, ethnicity or shared cultural background. Learned non-verbal cues require a community or culture for their reinforcement; table manners are not innate capabilities upon birth. Human children’s skills of shared intentionality develop gradually during the first 14 months of life as two ontogenetic pathways intertwine, so the developmental outcome is children’s ability to construct dialogic cognitive representations, which enable them to participate in human collective cognition.
Although silent understanding is generally recognized as a universal human phenomenon, the expression ishin-denshin is often used to describe this style of nonverbal communication between two people that is felt by some Japanese to be unique to the Japanese race. Whereas the Japanese concept of haragei denotes a deliberate form of non-verbal communication, ishin-denshin refers to a passive form of shared understanding. Ishin-denshin is traditionally perceived by the Japanese as sincere, silent communication via the heart or belly (i.e. symbolically from the inside, uchi), as distinct from overt communication via the face and mouth (the outside, soto), which is seen as being more susceptible to insincerities. Such concepts are related to the traditions of Zen, where the term ishin-denshin refers to direct mind transmission.
Ishin-denshin continues to influence many aspects of contemporary Japanese culture, ranging from business practices to end-of-life care. Research supports the view that Ishin-denshin is a mechanism for norm regulation that does not rely on explicit information exchange or costly reinforcement, but rather on the sensitivity of group members to social cues in their environment which can signal a threat to one’s inclusionary status in the group and (as in Japan) motivate people to shift their attitudes to be in line with group social norms.
Western need for crude clarity in interpersonal communication is often described as repellent or child-like by we Japanese people who believe ourselves more sensitive to ishin-denshin and implicit rather than explicit forms of understanding.
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