What is the described effect of listening to Mozart on babies?

• A. A large, lasting IQ increase
• B. A small, short-term arousal effect
• C. No effect at all
• D. An increase in vocabulary

Answer: (B)

The effect being tested is that listening to Mozart gives babies a small, short-term arousal boost rather than a lasting cognitive change. Research shows any advantage from listening to Mozart tends to be brief and linked to increased alertness or mood, not a permanent increase in intelligence. It does not support lasting IQ gains or vocabulary improvements. So the best description is a small, short-term arousal effect: a quick, temporary lift in readiness or attention that fades after the music stops.