Presenting the tone without the shock can diminish this conditioned fear; this process is called extinction. Since Pavlov's original conditioning studies, a key question has been whether this ...

but environmentalists continue to fear extinction of the rare plant. Tiehm's buckwheat, a small flowering perennial, is only found in a 10-acre area of Esmeralda County — land that is also home ...

We often look at sharks with fear, but it’s equally important to ... that have allowed them to survive through various extinction events. Here are a few: ...