Map of Ponnani on Each sense has its own receptors, responds to characteristic stimuli, and has its own pathways to a specific part of the brain. sensitive period a stage in development when an organism can most advantageously acquire necessary skills or characteristics. For example, in humans the 1st year of life is considered significant for the development of a secure attachment bond. It is important to note, however, that lack of appropriate growth-dependent experiences during a sensitive period does not permanently and irreversibly impact development, as it would during a critical period, but rather makes the acquisition process outside the period more difficult. sensitivity n. 1. the capacity to detect and discriminate. Map of Ponnani 2016.