Sensitive periods are those time periods during which certain _____ are especially important for course of 'normal' development.

Sensitive periods are specific times during development when an organism is particularly receptive to certain environmental stimuli. 

Key Points

• Environmental factors refer to external influences and experiences that impact development.
• These can include social interactions, sensory experiences, educational opportunities, and cultural contexts.
• During sensitive periods, environmental factors can have a profound effect on development.
• For example, a child exposed to rich and varied language experiences during the sensitive period for language development is more likely to achieve fluent language skills.

Hence, we can conclude that Sensitive periods are those time periods during which certain environmental factors are especially important for the course of 'normal' development.