I should also consider possible criticisms or debates around this concept. For instance, some might argue that this "extra quality" is subjective or hard to measure. How does Jackerman address these points? Are there empirical studies supporting his claims? Including examples of longitudinal studies where maternal warmth correlates with child outcomes could strengthen the essay.
: Music is used sparingly. This allows the "white noise" of the home to create a more grounded, realistic atmosphere. Vocal Performance jackerman mothers warmth chapter 3 extra quality