Arciniegas and Anderson mentioned that the decrease in suicide attempts in people with PD may be related to the effects of bradykinesia, akinesia, bradyphrenia
, and apathy.
Severe movement abnormalities and psychomotor deficits can sometimes be observed in patients with HAD, most notably in the form of bradykinesia (slowed movement), hypomimia, action/ postural tremor and hand agility, as well as bradyphrenia
(slowed information processing).
Bradykinesia and bradyphrenia
revisited: Patterns of subclinical deficit in motor speed and cognitive functioning in head-injured patients with good recovery.
Although they usually do not pose a significant problem for patients because they do not hinder day-to-day activities and responsibilities, subtle impairments such as bradyphrenia
(slowness of thinking) and difficulty with finding the right word can also develop in PD.
Anhedonia, avolition affective blunting, alogia, asocialization, and bradyphrenia
were negative symptom clusters considered to be fundamental defects by early investigators.