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Comparison of Complex Motor Stereotypies (CMS) vs. Tics
| Feature | Complex Motor Stereotypies (CMS) | Tics |
|---|---|---|
| Age of Onset | Early childhood (before age 3) | Typically 5–7 years old |
| Movement Type | Rhythmic, repetitive, coordinated | Sudden, brief, non-rhythmic |
| Common Examples | Hand flapping, finger wiggling, body rocking | Eye blinking, throat clearing, head jerking |
| Triggers | Excitement, stress, boredom | Often random, can be worsened by stress or fatigue |
| Voluntary Suppression | Yes, but difficult for long periods | Yes, but with increasing discomfort (premonitory urge) |
| Premonitory Sensation | Absent | Present (urge to perform the tic) |
| Progression Over Time | Typically stable, may decrease with age | Can change in type, frequency, or severity |
| Association with Other Disorders | Often in neurotypical children, but also seen in ASD, ADHD | Frequently linked to Tourette syndrome, OCD, ADHD |
| Treatment Needed? | Usually not required unless disruptive | Often improves with time; therapy or meds if severe |
CMS tends to be early-onset, rhythmic, and stimulus-driven, while tics are sudden, brief, and linked to an internal urge. 🚀
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