Field study’s lack control, more prone to extraneous variables E.G post event discussions
Case study’s
Johnson and Scott
Findings: the participants that witnessed the man holding a knife had poor recall due to their high anxiety levels
Procedure: Participants heard an argument whilst waiting in a waiting area, then witnessed a man walking through with either a knife (high anxiety condition) or a pen ( low anxiety condition.
Yuille and Cutshall
Procedure: interviews witnesses of a real life robbery
Findings: those participants who experienced the most stress had the most accurate recall 5 months later