You can try this right now. Close your eyes and picture yourself stretching your arms up as your spine lengthens along the y-axis. Finally, close your eyes and see yourself smiling in the z-axis. I find in my practice that the less dominant representational systems usually benefit the most from intensification. When the weaker representational systems become stronger, the stronger representational systems become more powerful.
Synaesthesia occurs when the contents of one representational system are mixed in with another.
Remember, the knife cuts both ways. If synaesthesia can invoke emotional pain, then surely synaesthesia can produce its relief. Hypnotherapists traditionally apply synaesthesia through metaphors, direct or indirect suggestion. The three representational meridians are another way to produce synaesthesia. At the very least, the intersection of the three meridian lines in Figure 1.0 explains why other methods bring about synaesthesia.