What Is Memory?
Memory is the process of learning, storing, and recalling information.
It allows us to remember experiences, learn new skills, and recognise people, places, and facts.
Three Memory Processes
1. Encoding
Encoding is the process of changing information into a form the brain can store.
Example:
Reading a new person's name and paying attention so you can remember it.
2. Storage
Storage is keeping information in the brain over time.
Some memories last only a few seconds, while others may last for many years.
3. Retrieval
Retrieval means bringing stored information back into your conscious mind.
Example:
Remembering the answer to a quiz question.
Three Stages of Memory
Sensory Memory
Holds information from our senses.
Lasts only a fraction of a second to a few seconds.
Helps us briefly process what we see, hear, smell, taste, and feel.
Short-Term (Working) Memory
Holds a small amount of information temporarily.
Usually lasts about 15–30 seconds without rehearsal.
Holds around 4–7 chunks of information.
Example:
Remembering a phone number long enough to dial it.
Long-Term Memory
Stores information for days, years, or even a lifetime.
Has a very large capacity.
Includes memories of facts, events, and skills.
Types of Long-Term Memory
Implicit (Procedural) Memory
Memory for skills and habits that happen automatically.
Examples:
Riding a bicycle
Swimming
Typing on a keyboard
Tying shoelaces
Explicit (Declarative) Memory
Memory that you can consciously remember and describe.
It has two main types.
Episodic Memory
Memory for personal experiences.
Examples:
Your first day at school
A birthday party
A family holiday
Semantic Memory
Memory for facts and general knowledge.
Examples:
Paris is the capital of France.
Water freezes at 0°C.
A triangle has three sides.
Important Brain Areas
| Brain Area | Main Function |
|---|---|
| Hippocampus | Forms and consolidates new long-term memories. |
| Amygdala | Processes emotional memories. |
| Cerebellum | Helps with movement and procedural learning. |
| Basal Ganglia | Supports habits and procedural memory. |
| Prefrontal Cortex | Working memory, attention, planning, and retrieval. |
Types of Amnesia
Retrograde Amnesia
Difficulty remembering events that happened before a brain injury.
Anterograde Amnesia
Difficulty forming new long-term memories after a brain injury.
Memory Errors
Memory is not like a video recording.
Sometimes we remember things incorrectly.
Misinformation Effect
New information changes what we remember.
Source Misattribution
Remembering information but confusing where it came from.
Transience
Memories naturally become weaker over time.
Blocking
Knowing the information but being temporarily unable to remember it.
Example:
"It's on the tip of my tongue!"
Eyewitness Testimony
Eyewitness memories can sometimes be inaccurate.
People may:
Forget details
Be influenced by leading questions
Become confident about memories that are actually incorrect
For this reason, eyewitness testimony should be considered carefully.
Ways to Improve Memory
Chunking
Group information into meaningful units.
Example:
Remembering 149217761945 as:
1492 – 1776 – 1945
Elaborative Rehearsal
Connect new information to something you already know.
Mnemonics
Use rhymes, acronyms, or visual images.
Example:
"My Very Educated Mother Just Served Us Noodles"
to remember the order of the planets.
Spaced Practice
Study over several shorter sessions instead of one long session.
This helps strengthen long-term memory.
Key Points to Remember
Memory has three processes: encoding, storage, and retrieval.
Information moves through sensory, short-term, and long-term memory.
Long-term memory includes procedural and declarative memory.
Declarative memory includes episodic and semantic memory.
Different brain areas have different roles in memory.
Memory can sometimes be inaccurate or influenced by outside information.
Chunking, rehearsal, mnemonics, and spaced practice all improve learning and memory.
