Core distinction and conditions
Memory questions often become clearer when you specify the target rather than beginning with a label. Encoding concerns how information is processed into memory; retrieval concerns accessing it later. Failure to report something does not prove that it was never encoded or that its representation has been erased. In interference tasks, different learning competes with access to the target. Earlier information interfering with a newer target is proactive interference. Newer information interfering with an older target is retroactive interference. The age of the competing information is interpreted relative to the requested target, not relative to the calendar alone.
Worked example: name the requested rule
A campus laboratory changes its file-naming convention. A researcher learns the new convention successfully but, when asked to use it, repeatedly types the old pattern. The target is the newer rule and the competitor is older learning, so the interference is proactive. Now reverse the request: an archivist needs the original convention, but the newer rule intrudes after extensive practice. That is retroactive interference. The visible error may look similar in both cases, yet the direction changes because the target changes. Neither description alone establishes permanent loss of the other convention.
Compare retention measurements
Seeing a definition repeatedly can make its wording feel familiar. A better test of usable access asks for its meaning with the definition hidden, preferably after a delay and with a new prompt. Retrieval practice with corrective feedback and distributed study are useful strategies to investigate, but their effects are not guaranteed for every task. Immediate list recall also illustrates why task conditions matter: early and late items may have advantages for different reasons. A distracting delay can reduce a recent-item advantage without requiring the early-item advantage to vanish. The pattern is evidence about the task, not a complete map of every memory process.
Transfer check: change the target
An illustrator learns a new keyboard shortcut and later cannot report the old shortcut because the new one comes to mind. Is this proactive or retroactive interference? It is retroactive, because newer learning disrupts the older target. If the old shortcut instead interrupted use of the new one, the label would switch. As a separate check, design a measure of retained concept knowledge that avoids merely asking whether the page looks familiar: use a delayed, definition-hidden explanation in a fresh context. You should be able to state both the classification and the condition that would change it.
Try it, then explain it.
Complete a short set without looking at the example. After each answer, explain which evidence or rule supports your decision and why the alternatives do not fit.
Sources & authorship
Original OpenExam explanations and examples. References support the concepts; they are not the source of copied questions. Independent educator review is pending.
OpenStax Psychology 2e, section 8-3OpenStax Psychology 2e, section 8-4Glanzer and Cunitz (1966), Two Storage Mechanisms in Free Recall