When Baby Jaleel was born, stimulation in his brain resulted in a massive overabundance of synapses. Neurons that were seldom stimulated began to lose their synapses. This process is known as

Kris and Jen like to go fishing on the weekends. They drive the boat to their favorite spot, drop anchor, toss their lines in the water and wait. They never know how long it will be before they catch a fish,

but they spend the time listening to music, nibbling on snacks and wine, and sharing great conversation. The reward of catching a fish is uncertain, but they don't worry about it! This is an example of a __________ schedule of partial reinforcement. a. variable ratio b. fixed interval c. variable interval d. fixed ratio

Which principle generally guides notions of physical attractiveness?

a. Ethnocentrism and culture influence our perceptions of attractiveness. b. Having attractive friends positively influences your own perceived attractiveness. c. Appropriate hip-to-waist ratio is important to many people. d. All of these principles affect notions of physical attractiveness.