Sensory acuity is the ability to notice and track subtle changes in another person's physiology. Calibration is the process of learning what specific physiological cues mean for a specific person. The following are the key modalities to observe:
| Modality | Range |
|---|---|
| Colour of face | Light to dark |
| Skin tonus | Shiny to matt |
| Lips | Thin with no lines to full with lines |
| Eye focus | Focused to defocused |
| Eye pupils | Dilated to not dilated |
| Breathing location | Lower abdomen, mid chest, upper chest |
| Voice tone | High to low |
| Voice tempo | Fast to slow |
| Posture | Shape of spine and neck |
| Gestures | Hand movements, tapping, scratching |
Developing strong sensory acuity allows a practitioner to track a client's state in real time and respond to what is actually happening, rather than what is being said.
See also: What is NLP?