H567/02 Section A - Memory: comparing the pair
Loftus and Palmer examined how questions can distort reports of an event; Grant and colleagues examined how environmental context can support retrieval. Comparing their evidence shows what changed in the study of memory and where claims about different people and cultures remain limited.
A shared cognitive method
Both studies infer internal memory processes from answers given under controlled conditions. Loftus and Palmer manipulated a collision verb and measured speed estimates or later glass reports. Grant manipulated study and test sound contexts and measured correct answers about an article. The shared cognitive principle is that remembering depends on processing conditions, rather than simply replaying a complete recording.
Both used laboratory experiments and independent groups for their main manipulated conditions. Giving different groups different verbs avoided exposing one participant to every leading question; giving different groups different context combinations avoided repeatedly learning the same article. Both therefore reduce certain order and demand effects, while remaining vulnerable to individual differences between groups. Grant explicitly reported random allocation within experimenters; Loftus and Palmer's primary report does not specify random allocation.
Both produced quantitative data and used inferential analysis to assess patterns. Standardised materials permit replication and controlled comparison. A number is not automatically a valid measure: estimated speed includes judgement skill, while a correct-answer score may reflect comprehension as well as retrieval.
Different questions about memory
The pair investigates different ways in which an event and its later retrieval are connected. These aligned differences explain why Grant broadens rather than repeats the classic study.
| Feature | Loftus and Palmer | Grant et al. |
|---|---|---|
| Main influence | Verbal information supplied after witnessing | Sound context present during learning and testing |
| Memory material | Traffic accident films | Meaningful psychoimmunology article |
| Main measurements | Estimated mph; yes/no reports of absent glass | Short-answer scores out of 10; multiple-choice scores out of 16 |
| Central pattern | Stronger wording increased speed estimates and false glass reports | Matching study/test contexts improved both test formats |
| Delay | Immediate speed questions; glass tested one week later | About two minutes between reading and testing |
| Samples | 45 and 150 students in separate experiments | 40 acquaintances aged 17–56; 39 analysed |
A direct comparison must state the relationship: “Loftus and Palmer studied post-event verbal influence, whereas Grant studied reinstatement of environmental sound.” Two separate descriptions without that connection do not explain a difference.
The original Loftus and Palmer Experiment 1 table gives “smashed” 40.8 and “contacted” 31.8 mph; Experiment 2 gives 16/50 false glass reports after “smashed” and 7/50 after “hit”. Grant's matching short-answer means were 6.7 and 6.2, compared with mismatching means of 4.6 and 5.4. These support different claims and cannot be placed on one numerical scale to decide which effect is “stronger”.
Both have restricted tasks, but Grant's academic article and tests resemble studying more closely than filmed accidents resemble involvement in a real crash. This is a qualified comparison of ecological relevance, not proof that Grant has high validity for every examination.
What Grant adds to memory understanding
The contemporary study adds evidence about successful retrieval rather than only misleading recall. Loftus and Palmer show that information introduced after an event can alter a report; their glass findings are consistent with reconstruction. Grant shows that environmental information linked to learning can later help access accurate information when reinstated.
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