Memory helps us learn, remember, and use information.
Memory has three main steps:
1. Encoding
Encoding is taking in new information.
Your brain changes information into a form it can store.
Paying attention helps encoding.
Example: Listening carefully in class.
2. Storage
Storage means keeping information in your memory.
Information may stay for a short time or a long time.
3. Retrieval
Retrieval means bringing stored information back into your mind.
Clues and reminders can make remembering easier.
Example: A familiar smell reminds you of your grandmother's house.
The Three Stages of Memory
Sensory Memory
Holds information from your senses.
Lasts only about 3 to 4 seconds.
Helps your brain decide what is important.
Example: Seeing a flash of lightning or hearing a loud bang.
Short-Term (Working) Memory
Holds information you are using right now.
Usually stores about 7 pieces of information (plus or minus 2).
Lasts about 20 seconds unless you repeat or use the information.
Example: Remembering a phone number long enough to dial it.
Long-Term Memory
Stores information for days, months, or even a lifetime.
It has a very large storage capacity.
Important memories are often stored here.
Example: Remembering your first day at school.
Types of Long-Term Memory
Procedural Memory (Implicit Memory)
Helps you remember how to do things.
You do not have to think about each step.
It controls skills and habits.
Examples
Riding a bicycle
Driving a car
Tying your shoes
Typing on a keyboard
Declarative Memory (Explicit Memory)
Stores information you can think about and explain.
Includes facts and personal experiences.
There are two types.
Semantic Memory
Stores facts and general knowledge.
Examples
T
The
capital of France is Paris.
Knowing that water freezes at 0°C (32°F).
Episodic Memory
Stores personal experiences.
Includes memories of places and events.
Examples
Your seventh birthday.
Your first day at college.
A family holiday.
Parts of the Brain and Memory
Hippocampus
Helps make new long-term memories.
Very important for learning facts and experiences.
Prefrontal Cortex
Helps with thinking, planning, attention, and working memory.
Amygdala
Processes emotions.
Helps emotional events become easier to remember.
Amnesia
Anterograde Amnesia
A person cannot make new long-term memories after a brain injury or illness.
Older memories are often still remembered.
Example: A person remembers childhood but cannot remember what happened yesterday.
Retrograde Amnesia
A person loses memories from before a brain injury.
New memories may still be formed after recovery.
Example: A person cannot remember their wedding but can remember new events.
Memory Is Not Perfect
Each time we remember something, the memory can change.
Memories can be affected by:
emotions,
suggestions from other people,
new information,
the passage of time.
This is called memory reconstruction.
Eyewitness Memory
Eyewitness memories are not always accurate.
People may remember things incorrectly because of:
leading questions,
misleading information,
focusing on a weapon instead of other details,
stress during the event.
This is why eyewitness evidence should be treated carefully.
Common Memory Errors
People may experience:
Transience – memories fade over time.
Absent-mindedness – forgetting because you were not paying attention.
Blocking – knowing something but not being able to remember it at that moment.
Misattribution – remembering information but linking it to the wrong source.
Suggestibility – other people's ideas change your memory.
Bias – beliefs and feelings influence memories.
Persistence – unwanted memories keep coming back.
Ways to Improve Memory
You can improve memory by:
Paying close attention.
Understanding information instead of just repeating it.
Grouping information into smaller chunks (chunking).
Using pictures and mental images.
Linking new information to stories or things you already know.
Practising active recall by testing yourself.
Reviewing information regularly using spaced repetition.
Getting enough sleep, eating a healthy diet, and exercising.
Key Points
Encoding = Taking in information.
Storage = Keeping information.
Retrieval = Remembering information.
Sensory memory lasts only a few seconds.
Working memory holds information you are using now.
Long-term memory stores information for a long time.
Procedural memory stores skills like riding a bike.
Semantic memory stores facts.
Episodic memory stores personal experiences.
The hippocampus helps create new long-term memories.
The amygdala links memories with emotions.
Memory can change over time and is not always completely accurate.
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