Akinesia: inability or difficulty to initiate movement. https://en.wikipedia.org/w/index.php?title=Hypokinesia&redirect=no Encyclopedia of Movement Disorders 2010 p.158e

Bradykinesia: slowness of movement (decreased velocity). https://en.wikipedia.org/w/index.php?title=Hypokinesia&redirect=no Encyclopedia of Movement Disorders 2010 p.158e Physical Management in Neurological Rehabilitation 2004 p.52e Dyskinesias – Advances in Research and Treatment 2012 p.153e Movement Disorders: Genetics and Models 2014 p.233e Neural Plasticity and Disorders of the Nervous System 2006 p.246e

Hypokinesia: refers to decreased amplitude of movement. Encyclopedia of Movement Disorders 2010 p.158e Physical Management in Neurological Rehabilitation 2004 p.52e Dyskinesias – Advances in Research and Treatment 2012 p.153e Movement Disorders: Genetics and Models 2014 p.233e Neural Plasticity and Disorders of the Nervous System 2006 p.246e

Dyskinesia: this term is not consistently used by authors. Seems like an umbrella term. The term is seen used when there is – i) presence of involuntary movement, ii) excessive movement, iii) difficulty in performing voluntary movement. It feels like the term is used in a lot of situation where the movement do not fit neatly into another category. Psychiatry Update: American Psychiatric Association 1985 p.160e Pharmacology in Rehabilitation 2015 p.675e Physical Management in Neurological Rehabilitation 2004 p.52e Neurology: Clinical Cases Uncovered 2011e http://www.medilexicon.com/medicaldictionary.php?t=27279 Pocket Guide and Toolkit to Dejong’s Neurologic Examination 2007 p.224e Levodopa-Induced Dyskinesia in Parkinson’s Disease 2014 p.4e Drug-Induced Movement Disorders 2004 p.259e Encyclopedia of Movement Disorders 2010 p.433e

Paresis: muscle weakness due to damage of either upper motor neurons or lower motor neurons. The Brain, the Nervous System, and Their Diseases 2014 p.805e

Paralysis: complete loss of motor function due to damage of either upper motor neurons or lower motor neurons. The Brain, the Nervous System, and Their Diseases 2014 p.805e