Medications that act on _____ are usually helpful to treat psychotic symptoms

By age four, most children understand conservation

Indicate whether the statement is true or false.

Thom's mental state is very affected by the weather. During the summer, he readily admits that he feels happier and more carefree. During the winter, when it is cold and gets darker earlier, Thom feels irritable and occasionally depressed

Thom's thoughts and behavior are impacted by ________. a) environmental variables b) social variables c) epigenetic variables d) cognitive processes.