Some wonder if people with synesthesia are just being metaphorical, as many people use metaphors that cross sensory modalities. a "loud shirt" doesn't actually produce a sound, a "warm color" doesn't actually evoke a change in temperature, and "bitter cold" doesn't actually produce a taste. what does cytowic friend say that suggests this isn't the case

Synesthesia is a neurological condition that an individual experience which allows her or him to perceive stimuli using a sense that is normally not associated with the stimuli. For example, people with chromesthesia, a type of synesthesia, can hear sounds when a color comes up – for example, hearing a trumpet when they see a red apple. There are various other types of synesthesia, such as seeing alphabets and at the same time seeing colors associated to them or hearing words and feeling a skin sensation with each different words said.  

Since these experiences are unique to the individual who has the condition, Cytowic’s friend should come up with a demonstration so that Cytowic can experience the same thing he does.

if interdependence implies a two-way dependence, and if each partner is equally dependent on the other for success, then there is an equal commitment to the making the partnership successful. the advantage is sustainability of the relationship, the disadvantage is that decisions are "democratic" and therefore may take longer to reach and more likely to be a compromise (which is not always the best solution). as the interdependence moves away from equality, the decisions become more influenced by the more independent partner. in the extreme the relationship becomes more dictatorial and more like "master-slave". generally the relationship has less commitment in both directions and is more likely to be temporary.

if one generalizes (and one shouldn't), equity partnerships, which is probably what is implied by interdependence, can be slow to progress or change but durable. the extreme alternative, independent-dependent partnerships tend to be efficient but more fragile.

hope this but you will have to site your own evidence. : )

the boundarys like convergent divergent and transform it causes subduction