There are generally considered to be three types of storage in the human brain: sensory memory, short-term memory, and long-term memory.
1. Sensory memory: Sensory memory is the initial stage of memory processing, where the brain briefly stores sensory information from the environment (e.g., visual, auditory, or tactile) for a very short period of time, typically less than a second. Sensory memory allows us to perceive the world around us as continuous and coherent, despite the fact that our sensory systems process information in discrete chunks.
2. Short-term memory: Short-term memory, also known as working memory, is the next stage of memory processing, where the brain temporarily stores information that is being actively processed or manipulated. Short-term memory has limited capacity and can hold information for a few seconds to a minute, unless it is rehearsed or transferred to long-term memory.
3. Long-term memory: Long-term memory is the final stage of memory processing, where the brain stores information that can be retrieved and used over a much longer period of time, from minutes to a lifetime. Long-term memory is generally considered to be divided into two main subtypes: declarative memory, which is responsible for storing factual information, such as names, dates, and events, and procedural memory, which is responsible for storing skills and habits, such as riding a bike or typing on a keyboard.
Each of these types of memory storage serves a different function in the brain and can be affected by different factors, such as age, injury, or disease.