FIGURE 8-32 Time-Dependent Effects Damage to the rat’s frontal cortex on the day of birth leads to cortical neurons with simple dendritic fields and sparse growth of spines in the adult (left). In contrast, damage to the frontal cortex at 10 days of age leads to cortical neurons with expanded dendritic fields and denser spines than normal in adults (right).

Information from B. Kolb and R. Gibb (1993). Possible anatomical basis of recovery of function after neonatal frontal lesions in rats. Behavioral Neuroscience, 107, p. 808.