Conversation limits the functional field of view.

Area of Science:

• Human-Computer Interaction
• Cognitive Psychology
• Transportation Safety

Background:

• In-car phone use is prevalent and associated with increased crash risk.
• Potential mechanisms for this increased risk include cognitive distraction and visual impairments.
• Understanding these mechanisms is crucial for developing effective safety interventions.

Purpose of the Study:

• To investigate whether hands-free in-car phone conversations reduce the functional field of view (FFOV).
• To explore FFOV reduction as a potential mechanism linking phone use to increased crash risk.

Main Methods:

• Two between-subjects experiments were conducted with college undergraduates.
• Participants performed a task measuring FFOV in isolation and during a hands-free conversational task.
• FFOV was quantitatively assessed under both conditions.

Main Results:

• The addition of the conversational task resulted in significant reductions in FFOV.
• These reductions were consistently observed across both experiments.
• The magnitude of FFOV reduction was substantial.

Conclusions:

• Hands-free in-car phone conversations demonstrably reduce drivers' functional field of view.
• This visual field reduction may be a critical factor contributing to the elevated crash risk associated with phone use.
• Findings support the need for strategies to mitigate visual distraction in drivers.