The middle has a harder time
The serial position effect is the tendency to remember the beginning and end of a list better than its middle. Where something appears can matter as well as what it says.
Imagine hearing a shopping list. Apples come first, lemons last, and somewhere between them are the carrots you forget to buy. It is a familiar way to picture the pattern, rather than a rule for every shopping trip.
Two ends, two names
The primacy effect is better recall of early items. The recency effect is better recall of recent ones. Both names describe which part gets an advantage.
On a graph, this often makes a U shape: stronger recall at either end, weaker recall in between. The American Psychological Association calls this a serial position curve.
It is a pattern, not a verdict
“Usually remembered best” does not mean “always remembered”. Forgetting one item in the middle does not prove the effect caused it, or tell you whether your memory is good or bad.
Nor does remembering the last answer in a quiz mean you will still know it tomorrow. Trying to recall it later asks a different question.
Give the middle another look
When checking a list, you could give its middle a second glance. That is a practical precaution, not a promise of perfect recall.
There is another way to make a list feel less crowded: chunking turns familiar pieces into groups. The carrots may still appreciate being written down.