A numeric scale from 0 to 10 measuring the emotional distress from the target image in the present moment. 0 — complete calm, 10 — unbearable distress. SUD is checked after each BLS set in the desensitization phase: a drop shows that reprocessing is moving. The aim is to bring SUD down to 0–1 before moving to PC installation. If SUD does not drop for 3+ sets in a row, consider a cognitive interweave.
Step-by-step guide
- Have the client recall the target image and the NC
- "How much does this disturb you right now? From 0 to 10"
- Record the initial SUD (usually 7–10 in the first reprocessing)
- After each BLS set: "What is the SUD now?"
- Continue until SUD = 0–1
- If SUD does not drop for 3+ sets — apply a cognitive interweave
When to use
- The Assessment phase (Phase 3) — initial measurement
- The Desensitization phase (Phase 4) — after each BLS set
Key phrases
Recall the image. Hold it in mind. How much does this disturb you right now? From 0 to 10, where 0 is no disturbance at all, 10 is the maximum.
Follow-up questions
After this set — what is the SUD now?
What is happening with the sensation?
Alternative phrasings
Do not think it through logically — just feel and say the number
Warnings
- ⚠️ If the SUD does not drop after 3+ sets — do not continue mechanically; look for a block
- ⚠️ SUD = 1–2 instead of 0 is often ecologically normal, especially in grief or with realistic threats
Source: Shapiro, 2001, 2018
Materials are informational and educational and summarize publicly available scientific sources. They are not medical or psychological advice, are not intended for self-diagnosis or self-treatment, and do not replace consultation with a qualified professional.