Inclusion Criteria:  Neurogenic dysphagia  Ischaemic and haemorrhagic strokes Infra- as well as supra-tentorial Polyradiculitis Parkinson's disease Multiple sclerosis Dementia Traumatic brain injury Post Covid-19 pat. patients over the age of 18.  Exclusion Criteria:  Contraindication to nasogastric tube, Unstable cardiac or respiratory condition that does not allow the insertion of the Nasogastric tube Pacemakers Implanted defibrillators (ICD) Pregnant Breastfeeding women  (Caution: interfering signals may be visible in ECGs, & EEGs with continuous recording).