Preyer-Tracy hypothesis of autogeneous motility

The idea that movements of the embryo begin before it is capable of responding to external stimulation as there are as yet no connections between motor and sensory neurons.  Thus, the first movements of the embryo result solely from the autonomous discharge of motoneurons.  The hypothesis gave rise to the notion of fixed action patterns …

Preventive interventions

Programs targeted toward at-risk individuals or populations to prevent the development of social adjustment problems, injuries and illnesses, as well as disabilities and disorders more generally.  Sometimes referred to as primary intervention (intervening before a problem has arisen) in contrast to secondary intervention (intervening while a problem is developing), and tertiary intervention (intervening after a …

Preterm infant

One delivered or born before 37 weeks of pregnancy have elapsed since the last normal menstrual period.  There are various ways of classifying and comparing preterm infants.  One is based on the absence or presence of age-related risk factors, giving rise to distinctions between low-risk versus high-risk preterm infants, and another is derived from the degree …

Prehension

Simply put, the act of reaching for and grasping an object.  For detailed innovative overview of the development and evolution of prehension, see https://mitpress.mit.edu/books/prehension See Action, Catching, Fine motor abilities, Functional reaching, Grasp response, Object-directed behaviors, Pincer grasp (or grip), Palmar grasp, Pre-reaching