Flashbulb memories are highly vivid memories of learning about a shocking or emotional event. Early studies found that people had accurate memories of the context and their reactions to significant events like the JFK assassination. However, later studies found that flashbulb memories lack consistency and accuracy over time, even if confidence in the memories remains high. While emotional events may be more memorable initially, repeated testing has shown that flashbulb memories are reconstructive and details can change substantially within a few years of the event.