Vygotsky's social account of psychology is comprehensible when viewed in relation to his political views and his early work experience. A brief discussion of this context is therefore in order before explaining the details of his psychological stand- point.
1 Central cyanosis and its causes are all associated with peripheral cyanosis. 2  Decreased pumping of blood by the heart or reduced cardiac output. 3  This is seen in heart failure or circulatory shock. 4  Diseases of circulation like thrombosis or embolism. 5  Constriction of blood vessels of the limbs, fingers and toes.
(1)Department of Neurology, Marshfield Clinic, Wis., USA. jacobsod@mfldclin.edu. BACKGROUND: A lesion affecting the optic radiations may produce a quadrantanopia based on the topographical arrangement of the geniculocalcarine tract. OBJECTIVE: To determine the localizing associations of a quadrantic visual field defect. DESIGN: Retrospective study of case records of 41 patients with inferior quadrantanopia and 30 patients with superior quadrantanopia caused by disorders affecting the posterior visual pathway.