Answer:
In this research, environmental stimulation would be considered the independent variable.
Explanation:
In research, the independent variable is the characteristic that tends to be controlled or modifyed to study its effect on another variable (that is known as the dependent variable). In the case presented, the researcher wants to study the effect of environmental stimulation on the prain development; the dependent variable is the brain development of young infants and the independent variable is the environmental stimulation, that is believed to have an effect on the brain development (dependent variable).
If he were to conduct an experiment, he would control or change the environmental stimulation (independent variable) in order to observe the changes in the brain development (dependent variable).
A candle flame
burning sugar
rusting iron
This is true, that a negative message is sent, because eye contact confirms to the other person that you are recognizing them speaking and are listening to what they are saying. It is always good to make eye contact when someone is speaking to not only show your respect but to communicate to them that they have your full attention.