Grandpa has us all worried and, frankly, scared. He has suddenly become suspicious of everyone and has some wild ideas about needing to protect himself from his loving family. His doctor has ruled out drugs and brain disease and suggests a psychological diagnosis:

The type of basic intelligence that makes learning quick and thorough is referred to as ______ intelligence

fluid crystallized practical creative

If a researcher wanted to know how loudly a person must speak in order to be heard above the noise of two other simultaneous conversations, the researcher would likely measure the ________

a. difference threshold b. marginal intensity c. relative magnitude d. absolute threshold