Effects of (tDCS) Combined With Virtual Reality Versus CPT on Brain, Cognitive, and GMS in Children With DS.

Inclusion Criteria: * Children aged 6-12 years diagnosed with Down syndrome by a pediatrician. * Compromised gross motor performance in standing, walking, running, or jumping domains of the Gross Motor Function Measure (GMFM). * Stable medical and neurological status. * Parental/guardian informed consent and cooperation. * Documented balance difficulties. * Ability to follow simple instructions in Urdu or locally spoken language. * Regular accessibility to the intervention site. Exclusion Criteria: * Neurological conditions other than Down syndrome. * Red flag conditions such as tumors, fractures, metabolic diseases, or dislocations. * Visual, cardiopulmonary, or severe musculoskeletal impairments requiring surgical management. * Recent surgery in the past 12 months. * Seizure history or sensitivity to electrical stimulation. * Presence of metal implants or hearing aids. * Tactile or sensory processing issues that prevent participation in therapy.