IB Psychology Reconstructive Memory Notes

Loftus and Palmer (1974)

Aim
To investigate whether memory could be influenced by misleading post-event information.

Method
Experiment; independent measures design.

Participants

• Experiment 1: 45 university students divided into 5 groups.
• Experiment 2: 150 students divided into 3 groups.

Procedure

Experiment 1

• Participants watched video clips of car accidents and answered questions.
• The critical question varied in the verb used: "About how fast were the cars going when they [smashed/collided/bumped/hit/contacted] each other?"
• Independent Variable (IV): Emotional intensity of the verb.
• Dependent Variable (DV): Speed estimates.

Experiment 2

• Participants viewed another car accident video.
• Groups were asked the critical question with the verbs "smashed" or "hit," while a control group received no critical question.
• One week later, participants answered whether they saw broken glass (none was present).

Results

• Experiment 1: Mean speed estimates increased with more emotionally intense verbs (e.g., "smashed" = 40.5 mph; "contacted" = 31.8 mph).
• Experiment 2: 32% of the "smashed" group falsely recalled broken glass, compared to 14% in the "hit" group and 12% in the control.

Conclusion

• Misleading information influences both memory and perception.
• Results support the genuine memory change explanation over response bias, as participants recalled nonexistent details (broken glass).

Shaw and Porter (2015)

Aim
To determine if false memories of committing a crime could be implanted in a lab setting.

Method
Interviews conducted over three weeks.

Participants
70 Canadian college students divided into "criminal" and "non-criminal" groups.

Procedure

• Participants were led to believe they had either committed a crime (e.g., theft or assault) or experienced a non-criminal emotional event (e.g., dog attack) during their youth.
• Researchers used visualization exercises and social pressure to encourage memory recall.

Results

• By the third interview, 70% of the "criminal" group developed false memories, recalling fabricated details about the alleged crimes.

Conclusion
False memories can be implanted through suggestive questioning and visualization.

Loftus and Pickrell (1995)

Aim
To investigate whether false childhood memories could be created.

Method
Interviews conducted over one week.

Participants
24 adults.

Procedure

• Family members provided real childhood events and plausible details for a fictional event (getting lost in a mall).
• Participants read about both real and false events and were interviewed about their memories.

Results

• 21% of participants recalled the false event, with some providing vivid details.

Conclusion
Memory is malleable and can incorporate fabricated events as real experiences.