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. 2021 Aug 20;9:e11882. doi: 10.7717/peerj.11882

Table 1. Inclusion criteria.

Inclusion criteria
General (All Groups)

  1. Being over 18;

  2. Ability to read and understand spoken or written English;

  3. Absence of dermatological condition on the upper limbs (that might disrupt peripheral sensations);

  4. Normal or corrected to normal vision;

  5. No known psychiatric disorder1
Pain-Free Control Group

  1. Pain free with normal sensation in the arms and hands;

  2. No current or past history of neurological issues (e.g. traumatic brain injuries, stroke, nerve injuries) or other medical conditions;
CRPS Group

  1. Diagnosis of upper limb CRPS2;

  2. No unresolved neurological or orthopaedic injury;

  3. Pain elsewhere.
Non-CRPS Group

  1. Non-CRPS type persistent (lasting > 3 months) upper limb pain;

  2. No unresolved neurological or orthopaedic injury;

  3. Pain elsewhere.

Notes:

1

Except for Depression or Anxiety disorders, due to the large incidence of these conditions within the population living with persistent pain (e.g. Vowles et al., 2020).

2

According to recommended criteria for research (Bruehl et al., 1999).