AP PSYCHOLOGY

Detailed explanation-1: -Neurogenesis is the process by which new neurons are formed in the brain. Neurogenesis is crucial when an embryo is developing, but also continues in certain brain regions after birth and throughout our lifespan.

Detailed explanation-2: -New neurons are either generated via symmetric or asymmetric divisions of non-radial glia-like progenitor cells (NR cells) or through direct neurogenesis from radial glia-like cells (R cells).

Detailed explanation-3: -Adult neurogenesis can be divided into four phases: a precursor cell phase, an early survival phase, a postmitotic maturation phase, and a late survival phase.

Detailed explanation-4: -The process of neurogenesis is most active during embryonic development and continues after birth for a year or 2 in humans.

Detailed explanation-5: -Neurogenesis is the formation of neurons de novo-the hallmark of a developing brain. In an adult animal brain, neurogenesis is said to occur in the lateral subventricular zone (SVZ) and the DG of the hippocampus (Figure 1).