The four main types of memories are: sensory memory, short-term memory, working memory, and long-term memory. Sensory memory allows you to retain information in brief bursts, lasting from fractions of a second to a couple of minutes. Short-term memory is more extended than sensory memory yet not as permanent, lasting around 15 to 30 seconds. Working memory is utilized actively as you go about performing cognitive tasks, holding information in active memory briefly while it is used, and capable of retaining this amount of information for a short time. Long-term memory captures information that persists over time, often ranging from minutes to a lifetime. Explicit memory includes episodic (relating to events in one's life) and semantic (relating to facts) memories. This memory requires active thought to recall information, such as the name of a high school classmate or the meaning of "neuroplasticity". Procedural memory is related to skills and how to do tasks, such as riding a自行车 or typing on a keyboard. Implicit memory is learned inadvertently, affecting behavior without conscious thought and including priming and conditioning techniques.