AP Psychology – Forgetting and Memory Errors (Ebbinghaus, Interference, Amnesia)

AP Psychology – Forgetting and Memory Errors (Ebbinghaus, Interference, Amnesia)

AP Psychology Study Guide: Forgetting and Memory Errors

(Ebbinghaus, Interference, Amnesia)

What This Is

Forgetting isn’t just "losing" memories—it’s a complex process influenced by time, interference, and brain damage. This topic explains why we forget (e.g., decay, interference) and how memory fails (e.g., amnesia, false memories). On the AP exam, you’ll need to distinguish between types of forgetting, apply theories (like Ebbinghaus’s forgetting curve), and analyze real-world cases (e.g., H.M.’s amnesia). Example: After learning a new phone number, you might forget your old one due to retroactive interference—new info blocks old info.

Key Terms & Concepts

• Forgetting: The inability to retrieve previously stored information. Can be due to decay, interference, or retrieval failure.
• Hermann Ebbinghaus: German psychologist who studied memory using nonsense syllables (e.g., "DAX"). Discovered the forgetting curve (rapid initial forgetting, then levels off).
• Forgetting Curve: Graph showing how memory retention declines over time without rehearsal. Formula: R = e^(-t/S), where R = retention, t = time, S = strength of memory.
• Encoding Failure: Information never entered long-term memory (e.g., not paying attention to where you parked).
• Storage Decay: Memories fade over time if unused (Ebbinghaus’s curve). Example: Forgetting a language you learned in middle school.
• Retrieval Failure: Inability to access stored memories (e.g., "tip-of-the-tongue" phenomenon).
• Proactive Interference: Old info disrupts recall of new info. Example: Calling your new partner by your ex’s name.
• Retroactive Interference: New info disrupts recall of old info. Example: Forgetting last year’s locker combo after learning this year’s.
• Amnesia: Memory loss due to brain injury, disease, or trauma. Two types:
• Anterograde Amnesia: Inability to form new memories (e.g., H.M., who couldn’t remember meeting new people).
• Retrograde Amnesia: Inability to retrieve old memories (e.g., forgetting your past after a head injury).
• Source Amnesia: Forgetting where you learned something (e.g., misremembering a dream as real life).
• Misinformation Effect: Incorporating false details into memories after exposure to misleading info (e.g., Loftus’s car crash study—"smashed" vs. "hit").
• False Memories: Recollections of events that never happened (e.g., believing you were lost in a mall as a child after being told a story).

Step-by-Step: Analyzing Forgetting Scenarios

Use this process to answer FRQs or multiple-choice questions about forgetting:

1. Identify the type of forgetting:
2. Is it decay (time-based), interference (old vs. new info), or amnesia (brain damage)?

3. Example: If someone forgets their childhood after a car accident-retrograde amnesia.

4. Check for interference:

5. Ask: "Is old info blocking new info (proactive) or vice versa (retroactive)?"

6. Example: Struggling to learn Spanish because French keeps popping up-proactive interference.

7. Apply Ebbinghaus’s curve:

8. If the question mentions time, recall that forgetting is rapid at first, then slows.

9. Example: Cramming for a test-most info lost within hours.

10. Consider memory errors:

11. Could misinformation or source amnesia be distorting the memory?

12. Example: A witness "remembering" a suspect’s face after seeing a mugshot-misinformation effect.

13. Rule out encoding failure:

14. If the info was never stored, it’s not forgetting—it’s encoding failure.
15. Example: Forgetting a name right after being introduced-didn’t pay attention.

Common Mistakes

• Mistake: Confusing proactive and retroactive interference.

• Correction: Proactive = old blocks new (e.g., old password blocks new one). Retroactive = new blocks old (e.g., new lyrics block old song lyrics).

• Mistake: Assuming all forgetting is due to decay.

• Correction: Interference and retrieval failure are often bigger culprits. Why? Ebbinghaus’s curve shows decay slows over time, but interference can cause sudden forgetting.

• Mistake: Thinking amnesia always means forgetting everything.

• Correction: Amnesia is usually selective (e.g., H.M. remembered his childhood but couldn’t form new memories).

• Mistake: Ignoring the misinformation effect in eyewitness testimony.

• Correction: Leading questions (e.g., "How fast were the cars smashing?") can distort memories. Why? Memory is reconstructive, not like a video recording.

• Mistake: Forgetting that retrieval failure is temporary.

• Correction: "Tip-of-the-tongue" moments show info is stored but inaccessible—it’s not gone.

AP Exam Insights

1. FRQs often ask you to:
2. Compare proactive vs. retroactive interference (e.g., "Explain how studying for two tests in one night could cause forgetting").
3. Apply Ebbinghaus’s curve to real-world scenarios (e.g., "Why do students forget most of what they cram the night before a test?").

4. Analyze amnesia cases (e.g., "H.M. could learn new skills but not new facts—what does this reveal about memory systems?").

5. Multiple-choice traps:

6. Decay vs. interference: Decay is time-based; interference is competition between memories.
7. Anterograde vs. retrograde amnesia: Anterograde = can’t form new; retrograde = can’t retrieve old.

8. False memories: The exam loves Loftus’s work—know that memories can be implanted (e.g., "lost in a mall" study).

9. Key distinction: Encoding failure (never stored) vs. retrieval failure (stored but can’t access).

Quick Check Questions

1. Multiple Choice: After learning her new locker combination, Maria can’t remember last year’s. This is an example of: a) Proactive interference b) Retroactive interference c) Source amnesia d) Anterograde amnesia Answer: b) Retroactive interference (new info blocks old info).

2. Short FRQ: Explain how Ebbinghaus’s forgetting curve applies to studying for an AP exam. How could a student use this knowledge to improve retention? Answer: Ebbinghaus’s curve shows rapid initial forgetting, so students should space out study sessions (spacing effect) and rehearse material to slow decay.

3. Multiple Choice: Which of the following is the best example of source amnesia? a) Forgetting where you parked your car b) Misremembering a childhood event after hearing a family story c) Struggling to recall a name after a head injury d) Forgetting a phone number after learning a new one Answer: b) Misremembering a childhood event (forgetting the source of the memory).

Last-Minute Cram Sheet

1. Ebbinghaus: Forgetting curve (rapid loss-levels off); nonsense syllables.
2. Proactive interference: Old blocks new (e.g., old password).
3. Retroactive interference: New blocks old (e.g., new phone number).
4. Anterograde amnesia: Can’t form new memories (H.M.).
5. Retrograde amnesia: Can’t retrieve old memories (soap opera amnesia).
6. Misinformation effect: Loftus’s car crash study ("smashed" vs. "hit").
7. Source amnesia: Forgetting where you learned something.
8. Encoding failure: Never stored (e.g., not paying attention).
9. Retrieval failure: Stored but can’t access (e.g., tip-of-the-tongue).
10. False memories: Can be implanted (e.g., "lost in a mall" study).