Do busy, cluttered scenes make eyewitnesses less reliable?
Witnesses to a crime or crash in a visually cluttered scene remembered peripheral details far worse and were more easily swayed by leading questions, yet usually felt about as confident.
Source
Perceptual Load Affects Eyewitness Accuracy and Susceptibility to Leading Questions
Study at a glance
- Design
- Human experiment — 2 x 2 between-subjects experiments: low vs high perceptual load scene crossed with regular vs leading questionnaire; a staged-theft video (Exps 1A, 1B) and a simulated car crash in a driving simulator (Exp 2)
- N
- Exp 1A: 111 public visitors; Exp 1B: 270 psychology students (most also returned a one-week follow-up); Exp 2: 93 licensed-driver visitors
- Population
- Adult members of the public at a university open night and introductory psychology students in Cork, Ireland
- Outcome
- Recall accuracy for central and peripheral details, line-up identification, memory confidence, and distortion by leading questions
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What they did
Across three experiments, people were randomly assigned to see either a sparse (low load) or cluttered (high load) version of the same event and then answered either neutral or leading questions. In Experiments 1A (111 public visitors) and 1B (270 students) the event was a one-minute video of a woman stealing items from an office while a man glanced in through the window; clutter was added via extra objects in the room. In Experiment 2, 93 drivers or passengers in a driving simulator witnessed a crash on a street that was either plain or full of colourful billboards and pedestrians.
What they found
High load cut memory for the stolen items and especially for peripheral details: in Experiment 1A peripheral objects were recalled by 49.8% of low-load viewers but only 9.4% of high-load viewers, and the man at the window was identified far less often, while memory for central details and the thief did not differ reliably. Leading questions distorted high-load memories more: for example, far more high-load viewers wrongly agreed a stapler was stolen, and leading wording inflated their estimates of time and speed more. High load in the simulator also impaired memory for the sound of braking, a cross-modal effect, while confidence differed by load in only one of the three experiments.
The limits
What it doesn't show
Load was not measured objectively; the authors simply built one 'low' and one 'high' version of each scene, so they cannot say how moderate levels of clutter would affect memory. Several load-by-leading-question interactions in Experiments 1B and 2 did not survive correction for multiple comparisons, and one-week follow-ups had poor response rates in Experiments 1A and 2. An alternative explanation, that clutter changes where attention is focused rather than overloading capacity, was not ruled out, and eye movements were not tracked.
Key terms
- Perceptual load
- The amount of visual information that must be processed in a scene or task; high load uses up limited perceptual capacity.
- Load Theory
- Lavie's theory that when perceptual load is high, spare capacity runs out and less relevant or peripheral information is not processed.
- Leading question
- A question worded to suggest a particular answer or detail, such as implying an object was present.
- Misinformation effect
- The distortion of memory for an event by misleading information encountered afterward.
- Inattentional deafness
- Failing to notice a clearly audible sound while attention is absorbed by a demanding visual task.
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Quiz yourself
Under high perceptual load, which memory was most clearly impaired?
Common questions
Were the cluttered objects simply distractions that people were told to ignore?
No. Participants were told to pay attention to all details because they would be questioned, so poor recall reflects capacity limits rather than deliberately ignoring information.
Why does high load make people more suggestible?
With a thinner memory of the event, witnesses rely more on cues in the question to reconstruct what happened, so misleading wording has more influence.
Can police use this to judge a witness's reliability?
Not yet. Because perceptual load has no objective measure, the authors say it cannot currently be used to rate how reliable a specific witness is.
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