Which factors influence the reliability of eyewitness testimony?

• A. Stress, lighting, distance, duration, memory decay, bias, and suggestive influences.
• B. Only memory decay matters.
• C. Eyewitness reliability is constant and not affected by context.
• D. Weather conditions only.

Answer: (A)

Eyewitness reliability depends on how well a person encodes what they see, stores that information, and later retrieves it. A range of factors can alter that process. Stress at the moment can shift attention and memory encoding—often sharpening focus on a central threat but blurring details elsewhere, which can reduce overall accuracy. Lighting and visibility matter because if details aren’t clearly seen, they’re harder to recall later. The distance from the event and how long the witness is exposed to the scene influence how much detail is captured in memory. Over time, memories fade or become distorted, a natural decay that reduces reliability. Personal biases, expectations, and prior knowledge can color interpretation of what was seen, leading to errors. Also, suggestions or leading questions from others can contaminate memory, introducing details that weren’t actually observed or altering confidence in false details. Because memory is reconstructive and influenced by context, reliability is not fixed and depends on these interacting factors.

Other options are too narrow or incorrect: focusing only on memory decay ignores the many perceptual and contextual influences; claiming reliability is constant misstates how memory works; and singling out weather conditions omits the central perceptual and cognitive factors that truly shape accuracy.