Final answer:
Taste of food and relief from a headache are both considered primary reinforcers because they satisfy biological needs and provide pleasure, inherently reinforcing behaviors linked to these experiences.
Step-by-step explanation:
The taste of food and relief from a headache are both examples of primary reinforcers. Primary reinforcers are innate and not learned; they include necessities and pleasures like water, food, sleep, shelter, and pain relief. When experiencing pleasure from tasty food or relief from a headache, these are inherently reinforcing because they satisfy basic biological needs or provide pleasure, and organisms have a natural drive towards these experiences. In contrast, secondary reinforcers are conditioned and learned, such as money or a toy for a child.