What is the primary difference between the findings of laboratory studies and real-life field studies regarding anxiety and EWT?

Laboratory studies often show that anxiety decreases accuracy (due to weapon focus), while field studies of real-life crimes often show that high stress leads to more accurate and vivid recall. This discrepancy is usually attributed to the higher ecological validity and genuine physiological arousal present in real-life situations.

How does the 'Weapon Focus Effect' differ from general anxiety in its impact on memory?

General anxiety refers to an overall state of arousal, while the Weapon Focus Effect is a specific narrowing of attention toward a threat. While general anxiety might improve alertness, Weapon Focus specifically impairs the ability to remember peripheral details like the perpetrator's face because attention is physically fixated on the weapon.

When comparing the 'surprise' hypothesis to the 'anxiety' hypothesis in weapon focus, what is the key distinction?

The anxiety hypothesis suggests that fear causes the narrowing of attention, whereas the surprise hypothesis suggests that we focus on weapons because they are unexpected or unusual in the context. Research showing that unusual but non-threatening objects also reduce accuracy supports the surprise hypothesis.

What is a common misconception about the relationship between stress and memory accuracy?

A common mistake is assuming that stress always makes memory worse. In reality, the relationship is an inverted-U; moderate stress can actually enhance memory by increasing alertness and focus, and only extreme stress leads to significant impairment.

Why is it an error to rely solely on the Yerkes-Dodson Law to explain EWT accuracy?

The Yerkes-Dodson Law is often criticized for being too simplistic because it focuses only on physiological arousal. It ignores cognitive factors, such as how a witness interprets the situation, their individual personality, and their emotional state, all of which influence memory.

What error occurs when researchers generalize laboratory findings on anxiety to real-world court cases?

This is an error of ecological validity. Participants in a lab know they are safe and are not experiencing a true 'fight-or-flight' response, meaning their cognitive processing may be fundamentally different from a real victim's processing during a crime.

Define the 'Inverted-U Hypothesis' in the context of EWT.

It is the theory that EWT accuracy increases with arousal up to an optimal point, after which further increases in anxiety lead to a decline in performance. It is based on the Yerkes-Dodson Law.

What is the 'Weapon Focus Effect'?

It is a phenomenon where a witness's attention is captured by a weapon, leading to reduced memory for other details of the crime scene and the perpetrator's appearance.

What physiological mechanism is thought to enhance memory during high-anxiety real-life events?

The release of adrenaline and the activation of the 'fight-or-flight' response. This increases alertness and can lead to more effective encoding of the event as the brain prioritizes survival-related information.

How does the 'fight-or-flight' response theoretically affect eyewitness recall?

It creates a state of high physiological arousal that can either narrow attention to a specific threat (reducing peripheral accuracy) or increase overall alertness (improving central accuracy), depending on the intensity and nature of the situation.

Factors Affecting the Accuracy of Eyewitness Testimony: Anxiety | AQA A-Level Psychology

Factors Affecting the Accuracy of Eyewitness Testimony: Anxiety

Summary

The relationship between anxiety and the accuracy of eyewitness testimony (EWT) is complex and non-linear. While high levels of stress can impair memory through mechanisms like the weapon focus effect, moderate levels of arousal may actually enhance recall by triggering physiological alertness. This dual impact is often explained by the Yerkes-Dodson Law, which suggests an optimal level of arousal for peak cognitive performance.

1. Definition & Core Concepts

Anxiety in the context of eyewitness testimony refers to a state of emotional and physical arousal characterized by feelings of tension, worried thoughts, and physiological changes like increased heart rate.
Eyewitness Testimony (EWT) is the legal term for an account given by people of an event they have witnessed, which is often used in court to identify perpetrators or reconstruct crime scenes.
The impact of anxiety is debated because it can act as both a distractor (reducing accuracy) and an enhancer (increasing alertness and memory consolidation).

2. The Negative Impact: Weapon Focus Effect

The Weapon Focus Effect occurs when the presence of a weapon (like a knife or gun) draws the witness's attention away from other details, such as the perpetrator's face or clothing.
This phenomenon is driven by the fight-or-flight response, where the brain prioritizes the immediate threat (the weapon) over peripheral information.
Research suggests that when anxiety is high due to a perceived threat, the cognitive resources available for encoding the wider environment are significantly reduced, leading to lower identification accuracy.

3. The Positive Impact: Physiological Alertness

Conversely, anxiety can have a positive effect on memory through the release of adrenaline, which triggers a state of high alertness and improved sensory processing.
In real-life high-stress situations, witnesses often show remarkably accurate and long-lasting recall, suggesting that the emotional intensity of an event can help 'cement' the memory.
This evolutionary perspective argues that it is beneficial for an organism to remember dangerous situations vividly to avoid similar threats in the future.

4. The Inverted-U Hypothesis (Yerkes-Dodson Law)

The Yerkes-Dodson Law diagram showing an inverted-U relationship between arousal and memory accuracy.

5. Key Distinctions: Lab vs. Field Research

6. Exam Strategy & Tips