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324 Computational Intelligence Algorithms
FIGURE 21.1 Muscles of the cervical spine.
21.3 SENSORIMOTOR SYSTEM AND PROPRIOCEPTION
Dr. Vladimir Janda, during the 1950s and 1960s, advocated that sensory and motor systems cannot be taken as two different, separately working systems; instead, he integrated them in his approach to manage chronic pain syndromes[20] (see
Figure 21.2). Janda and VaVrova (1996) developed rehabilitation of the lower
extremities as well as the spine [21]. It was recommended that there are three loca­tions in the body where enormous amounts of proprioceptors are present, which are mainly the foot, sacroiliac joint (SI), and the cervical spine. The aim was to increase proprioception of these sites to facilitate a smooth, well-coordinated movement pattern.
Proprioception was rst devised by Dr. Charles Sherrington (1906). It was dened as a sense of position, posture, and movement. Freeman and Wyke (1966) did further research and declared that proprioceptive receptors were found in the nerve endings of the joints of cats, and if these receptors were disconnected from the CNS, cats were incapable of walking correctly [22]. To describe proprioception includes afferent information arising from joint mechanoreceptors that are respon­sible for postural control, joint stability, and other conscious sensations. Thus, it includes subsystems: joint position sense (posture of segment), kinaesthesia (which can be active or passive), and resistance to movement as described by Sherrington [23, 24]. Contrary to this, Somatosensory System is a broader term that encircles
FIGURE 21.2 The sensorimotor system.
325 Targeting Upper-Limb Sensory Gaps
mechanoreceptors, thermoreceptors, and nociceptors [24]. Proprioceptors are present in muscle, tendon, ligament, and capsule, while other mechanoreceptors are also found in deep skin and fascia [25]. Those located in the musculotendinous junction are known as Golgi tendon organs (GTOs), whereas muscle spindles are found in muscle tissue. The main function of GTOs is to cue for active muscle ten­sion, i.e., during the state of contraction, and not during an inactive or passive state [26]. Any goal-directed movement requires feedback through mechanoreceptors and feed-forward control, i.e., anticipating change [24].
21.4 ALTERED PROPRIOCEPTION IN MUSCULOSKELETAL DISORDERS
Altered proprioception can be related to various clinical ndings like pain, mus­cle fatigue, and effusion [27]. Cervical spine disorders can lead to the develop- ment of impaired proprioception, as stated [28].
21.5 ALTERED PROPRIOCEPTION AND ITS CONSEQUENCES
Consequences such as changes in motor control strategies were observed. For instance, decreased activation of deep cervical exors was observed dur­ing upper-limb tasks [29]. Painful musculoskeletal disorders alter load sharing among muscles and result in various neuromuscular adaptations and decreased repositioning acuity in performing movement tasks [10, 30]. These dysfunctions
326 Computational Intelligence Algorithms
result in clinical symptoms of disrupted coordination and smoothness of move­ment [28].
21.6 UPPER-LIMB PROPRIOCEPTION IN CHRONIC NECK PAIN
Cervical muscles of the spine have abundant proprioceptive receptors, which have an association with central and peripheral reexes, including the vestibular system, postural control, and visual systems [31]. Additionally, the suboccipital muscles par­ticularly own a high density of muscle spindles [27, 32]. The upper-cervical spine from C1 to C3 has direct connections to the vestibular nuclear complex and the supe­rior colliculus, for synchronization between the head and neck movement with vision [33, 34]. It was seen in a handful of studies that position sense in arm movement, i.e., repositioning acuity, is reduced. Reduced repositioning acuity of the elbow in people with whiplash-associated disorder (WAD) and of the shoulder in CNP and WAD has been observed [10, 35]. Röijezon et al. (2009) hypothesized that CNP has decreased neck-shoulder proprioception due to reduced precision in fast pointing movements [36]. Moreover, CNP was found to have more jerky movements of the cervical spine with decreased smoothness of the movement, leading to poor motor control [28]. The head position has a major impact on the organization of sensory information for upper-limb proprioception [35, 36]. Furthermore, it was postulated that any change in the position of the head and neck with vision occlusion affects sensory informa­tion and elbow joint position sense in neck pain patients with WAD [35]. Thus, they demonstrated that the position of the head determines the position of upper-limb seg­ments as CNS constantly matches the position of the head and neck with the upper limb; consequently, head movements and altered proprioception result in reduced accuracy of upper-arm movements [11]. It is suggested that the acuity tasks of point- ing, especially endpoint acuity, were variably affected in CNP patients compared to healthier controls [10]. From a functional point of view, affected proprioception and goal-directed movements reduce the ability of an individual to carry out activities like carrying, reaching for objects, and lifting. If there is a small increase in endpoint variability, it will affect precision and timing, which will eventually compromise the performance of an individual whether in playing sports or any musical instrument [10]. Possible mechanisms as postulated by Yilmaz et al. (2024) are quite tentative. They include reduced acuity of signals from the muscle spindle system and injuries of the peripheral nervous system somewhere along the sensory pathways, although they argue that it is not a major factor, as there are no symptoms of paresthesia or sensory loss in their patient population [10]. Visual disturbances and oculomotor decits have been found to affect those with chronic neck pain. A strong association between self-rated neck function and endpoint acuity was found. [37].
21.7 IMPLICATIONS IN REHABILITATION
The main objective of this analysis is to provide an update on the rehabilita­tion of CNP patients and to extend the knowledge of clinicians to develop a new treatment regimen of scapular stabilizers and upper-limb proprioception
327 Targeting Upper-Limb Sensory Gaps
training as an adjunct in the current exercise methods. Active joint repositioning technique for enhancing upper-limb proprioception is based on motor learning. Motor learning is dened as relative or permanent changes in behavior that are enhanced by the practice of movements [38]. The two main effects of motor learning are retention and transfer. Retention is when the changes last for a longer time due to neuroplastic changes in the CNS, and the transfer effect is when the transfer of this training is seen in other similar tasks or daily activity task requirements [38]. To enhance the training, the factors responsible are that we must ensure that exercise is not too easy or too difcult for the patient and should be adjusted accordingly to the patient’s skills (challenge point frame­work). Secondly, it should include repetitive solving skills rather than repeating it only once [38, 39].
Each patient will encounter three phases of motor skills acquisition: the cognitive
phase, the associative phase, and the autonomous phase (see Figure 21.3).
Cognitive phase: It involves making the patient understand what to do. This
phase has inconsistent but large gains.
Associative phase: When the patient determines the strategy to perform the
task. Here the gains are more gradual.
Autonomous phase: When less conscious is needed to perform the task and is
simultaneously performed with other tasks [39, 40].
Looking at these aspects, we can determine whether motor learning improves after proprioceptive training. Ostry et al. (2010) postulated that teaching an individ­ual to reach with a directional force will result in systematic change in the perception
FIGURE 21.3 Phases of motor skill acquisition.
328 Computational Intelligence Algorithms
of hand position in space, and the perceptual change persisted for 24 hours even when the duration of training is as short as ten minutes [41]. Thus, learning to pro­duce accurate movements is both sensory and motor [42]. Wong et al. (2012) experi­mentally concluded that motor learning is improved by proprioceptive training [43]. The observed motor learning improvement results from changes in motor cortical regions and subcortical regions. The other areas involved are the cerebellar cortex and dorsal premotor cortex [42].
21.8 CONCLUSION
There is a scarcity of research on the aforementioned concept, i.e., upper-limb pro­prioceptive training in CNP patients. Although the work of Cagnie et al. (2014) and Cools et al. (2013) signies the scapulothoracic muscle’s role in neck pain patients, literature still lacks any evidence-based study for upper-limb proprioceptive train­ing to the best of our knowledge and skills [8, 9]. The prognosis of CNP is poor as indicated that 50−85% of patients who experience CNP report neck pain in the next ve years [44]. Thus, it depicts that most of this patient population does not recover absolutely. A ne-tuned sensorimotor system is essential for various tasks that require precision. When the proprioception is the decit, the vision outweighs performing movements [45]. Another method to improve accuracy in goal-directed movements is the co-contraction of antagonistic muscles or stiffening of the muscles to improve endpoint movement variability. Their hypothesis is based on neuromotor noise theory, which describes that prolonged and repetitive movements will result in increased muscle co-contraction [46]. This leads to greater stress on the head and neck and makes it more vulnerable to strains. Consequently, this co-contraction of the muscles reduces the error of the movement but results in wear and tear of small bers [47].
Other than these large bodies of previous works, recent research is more focused on the kinetic chain. Abichandani and Parkar (2015) postulated that there is a repositioning error in the shoulder, elbow, and wrist joints in CNP patients as compared to healthier controls [48]. Zabihhosseinian et al. (2015) concluded in their study that altered or disrupted upper-limb proprioception due to neck muscle fatigue has negative implications in workplace settings as well as in sports and recreation by increasing the chances of upper-limb injuries [11]. Lastly, a recent study conrmed that in CNP patients with neck fatigue, wrist joint position sense is affected [49].
There is a need to understand these interconnections and their impact on the population of CNP. This will help clinicians identify the cause of the symptoms and treat patients with long-term goals to prevent reoccurrences. Integration of these systems should be the focus of all treatment regimens rather than treating the condition in isolation. The entire purpose of presenting this literature is to bring forward an insight into recent advances in the physiological basis of our treatment approaches. Regimens that are more focused on movement control and that integrate vision and proprioception of the neck and upper extremities should be a part or adjunct to the rehabilitation of CNP.
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Index

Note: Bold page numbers refer to tables and Italic page numbers refer to gures.
A
Acoustic analysis, 148 Adaptive convolution neural network, 161, 162,
Alzheimer’s disease (AD), 3, 174, 175, 176, 177,
Alzheimer’s Disease Neuroimaging Initiative
Amyotrophic lateral sclerosis, 8 Articial intelligence (AI), 45, 46, 48, 49, 81,
Articial neural network, 206, 207, 243, 244,
Attention mechanism, 39, 167 AUC-ROC, 208, 209, 210 Auditing, 46 Autism spectrum disorder, 5, 12, 109, 113, 2 61 Autoencoder, 227, 229, 243 Auto nom y,
163, 164, 16 6, 167
182 , 183, 184 , 188, 219, 224, 228, 229, 290, 291, 292, 293
(ADNI), 127, 128, 137, 175, 228,
292, 293
195, 196, 254, 311, 313, 317
246, 249, 250
, 248
42, 46, 47, 48, 54, 55, 56, 60, 61
B
Batch normalization, 189 Beta-amyloid plaques, 7 Bioavailability, 90, 92, 97, 98, 103 Biomedical signal analysis, 311 Blood, 91 Brain anatomy, 9 Brain computer interface (BCI), 101 Brain hemorrhage, 239 Brain MRI, 291 Brain targeting, 97, 99, 102 Brain tumor, 9, 81, 87, 92, 98, 99, 112, 125, 136,
Breath hold techniques, 74
137, 161, 162, 163, 164, 165, 166, 167, 169, 171, 172 , 173
C
Central Nervous System (CNS), 90, 91, 93, 95,
Cerebral palsy, 7 Cerebrospinal uid, 10 Cerebrovascular diseases, 5 Chronic stress, 13 CI algorithms, 59, 60
98, 102, 103
Classication accuracy, 127, 128, 149, 163, 169,
175, 17 7, 179, 18 4
Clinical psychiatry, 56 Computational complexity, 294 Computational intelligence, 54, 55 Computational neurology, 18, 19, 20, 26 Confusion matrix, 157, 18 4, 185, 186 , 276, 278,
279, 280, 281, 283, 284
Convolutional neural network, 72, 81, 101, 126,
133, 148 , 162, 163 , 175, 176, 197, 220,
224, 242, 244, 271, 290, 291, 313
Cyclegan, 131
, 185, 186, 188
D
Data augmentation, 124, 133, 139, 140, 141, 14 4,
Data privacy, 45, 47, 49, 51, 61, 126, 232, 293, 295 Decision tree, 114, 14 8, 150, 153, 156, 157, 158,
Deep belief network (DBN), 247, 291 Deep learning (DL), 10, 39, 71, 72, 101, 109, 111,
Deep neural network (DNN), 36, 37, 166, 177,
Deep residual network, 174 , 188 Dementia, 8, 7, 10, 13, 56, 76, 77, 101, 113, 174 ,
Dendrimers, 97 Detection, 81, 82, 86, 87, 90, 101, 110, 114, 115,
Diabetes, 7, 8, 13, 91, 210 Diffusion tensor imaging, 9, 34, 207, 242, 244, 291 Digital therapeutics, 315 Disorder, 90, 93, 94, 96, 98, 100, 101, 109, 111,
Diseases, 3, 5, 6, 8, 9, 10, 12, 13, 18, 21, 22, 25, 26,
168, 176 , 182, 183, 244, 248, 271,
272, 293
159, 195, 197, 199, 206, 210, 221, 224,
225, 226, 243, 260, 271, 292, 311, 314
114, 124, 126, 162, 175, 195, 199, 227,
229, 239, 272, 290, 291, 295, 311, 31 2,
313, 316
227, 243, 246, 316
177, 182, 18 5, 186, 219
122, 125, 126, 128, 133, 136, 139, 140,
141, 143, 144, 148, 150, 159, 162, 163,
164, 16 9, 174, 175, 176, 18 2, 195, 196,
200, 206, 207, 211, 213, 219
112 , 113, 138, 139, 141, 14 2, 143, 14 4,
148 , 161, 193, 200
253, 254, 2 61, 270
29, 45, 54, 56, 59, 76, 77, 82, 83, 84, 85,
87, 90, 91, 92, 94, 95, 98, 100, 101, 102
, 220, 290, 291
, 204, 231, 239, 242,
333