Primary visual receiving area refers to the Occipital cortex where visual signals that originate in the eye first reach the Cortex.

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Primary visual system is defined as the phylogenetically more recent visual system which functions poorly in newborns. Processing of visual information is done by the fovea, permitting careful analysis of stimulus properties. Primary visual system is in contrast with Secondary visual system.

Primary-process thought is defined as a child-like thinking by which the Id attempts to satisfy the instinctual drives.

Primary-stage syphilis refers to the first few weeks of a syphilis infection during which the Chancre is present. Chancre is a painless, ulcerlike lesion with a hard, raised edge that is a symptom of syphilis.

Primate is the order of mammals that includes humans, chimpanzees, gorillas, and others

Primates refer to monkeys, apes, and humans

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Prime may be defined as the prior experience that may not facilitate (prime) behavior Prime also refers to a node that activates a connected node. This activation is known as the "Priming effect"

Prime adaptive ego qualities refer to mental states that form a basic orientation toward the interpretation of life experiences. New ego qualities emerge in the positive resolution of each psychosocial crisis.