What is a method to deal with large numbers of observed variables that are thought to reflect a smaller number of underlying variables?

___ alters the output of ___

A) The presynaptic neuron; the postsynaptic neuron B) An autoreceptor; the presynaptic neuron C) An autoreceptor; postsynaptic neuron D) An autoreceptor; the sodium-potassium pump

Older adults who suffer from anxiety

A) often experience symptoms of depression first. B) typically attribute their symptoms solely to medical conditions or medication reactions. C) use more psychological terms to describe their symptoms compared with younger adults. D) focus more on their physical symptoms than their psychological distress.