Media type: E-Article Title: A Focal Periods Hypothesis in Sensorimotor Development Contributor: Blank, Marion Published: JSTOR, 1964 Published in: Child Development, 35 (1964) 3, Seite 817 Language: Not determined DOI: 10.2307/1126507 ISSN: 0009-3920 Keywords: Developmental and Educational Psychology ; Education ; Pediatrics, Perinatology and Child Health Origination: Footnote: