Impact of attachment, temperament and parenting on human development

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3534157/

Sensitive and responsive care from parents is vital for the optimal growth and development of each child. Children who are rarely spoken to, who are left to cry themselves out, who have little opportunity to explore their environment, or who experience frequent anger or boredom cannot fully develop their potential and stable personalities, despite their normal genetic endowment.