Motor control exercises with three different progressive phases were applied to all patients in this group accompanied by a physiotherapist.

Pressure pain threshold (PPT) assessment will be performed with a device called algometer to evaluate the individuals' pain sensitivity. Initially, 2 trials are performed on the extensor muscles of the forearm to familiarize the participant with the procedure. Afterwards, the person is positioned according to the area to be measured and the measurement points are marked with a pencil. The algometer is placed perpendicular to the skin and a constant pressure is applied. The participant is asked to say "stop" when the feeling of pressure or discomfort turns into a clear sensation of pain. Three measurements are taken at 30 s intervals at each site. The values are averaged and recorded. In this study, right/left C1-C2 and C5-6 articular region, upper part of the Trapezius muscle, Deltoid muscle insertion, lateral epicondyle will be used as measurement points. Measurements will also be made on the Tibialis anterior muscle to assess overall pain sensitivity.

The alexithymia will be assessed by the Toronto Alexithymia Scale (TAS). The scale is a Likert-type self-assessment scale consisting of 20 items and scored between 1-5. Difficulties in recognizing emotions (TAS-1), difficulty in speaking emotions (TAS-2), extroverted thinking (TAS-3) subscales. The individual is asked to select the best option for each item from "Never", "Rarely", "Sometimes", "Often" and "Always". The higher the score, the higher the level of alexithymia.

The Montreal Cognitive Assessment Questionnaire (MoCA) will be used to assess the cognitive function of individuals. MoCA was developed as a rapid screening test for mild cognitive impairment. MoCA assesses various cognitive functions such as attention and concentration, creative functions, memory, language, visual structuring skills, abstract thinking, computation, and orientation. The application of MoCA takes about 10 minutes. The maximum total score of the test is 30. A score of 21 or above is considered normal.

The Pain Catastrophizing Scale will be used to evaluate the individual's pain-related catastrophizing thoughts. In the scale consisting of thirteen questions, each question is scored between 0-4. It is graded as "0" never, "1" mildly, "2" moderately, "3 severely, "4" always. The answers to the thirteen questions are summed to obtain a score.

The Tampa Kinesiophobia Scale (TKS) will be used to assess the kinesiophobia levels of individuals. The TKS is a 17-question Likert scale that examines activity-related injury/reinjury and fear-avoidance parameters. The score on the scale ranges from 17-68, and the higher the score, the higher the level of kinesiophobia.

The Fremantle Neck Awareness Questionnaire will be used to assess how individuals perceive the neck area relative to their body. In the questionnaire, there are 9 questions measuring how individuals perceive their neck relative to their body and how they perceive their body position, and the questions are answered in Likert type as "0" I never feel like this, "4" always or often feel like this.

The Body Awareness Rating Questionnaire will be used to assess the body awareness of individuals. This self-reported questionnaire consists of 4 different factors indicating different aspects of body awareness. The factors assess body awareness in terms of function, feeling/emotion, mood and awareness. Each item is scored on a 7-point Likert-type scale. Scores for each factor range from 6 to 42, with higher scores indicating greater body awareness

The Central Sensitization Scale will be used to assess central sensitization. The Central Sensitization Scale is a valid and reliable scale that identifies whether patients' existing symptoms are associated with central sensitization. It consists of two parts. Part A consists of 25 items, including somatic and emotional symptoms related to central sensitization, while part B inquires about previous diagnoses of central sensitization syndromes or related diseases. The frequency of symptoms is assessed on a four-point Likert scale from 0 (never) to 4 (always). The total score ranges from 0 to 100, with higher scores indicating a high degree of central sensitization.

A Hydraulic Hand Dynamometer will be used to measure hand grip strength. The assessment will be performed using the standard measurement method of the American Association of Hand Therapists. For the assessment, the participant is held in an upright sitting position, feet in contact with the floor, arm next to the body, elbow in 90◦ flexion, forearm and wrist in a neutral position. To assess hand grip strength, the evaluated participant's hand is placed so that it grasps the second measurement range of the dynamometer. Grip strength will be assessed by changing hands between measurements and three measurements will be taken for each hand. An interval of 15 seconds will be used between each measurement. The average of the three measurements will be recorded.