Question

a father purchased a new singing toy for his baby daughter. when a button was pressed on the toy, a song began to play, and the baby smiled. what sensory process caused the baby’s behavior?
a. sensory receptors in the baby’s eyes sent a signal directly to her facial muscles, causing her to smile.
b. sensory receptors in the baby’s ears sent a signal directly to her facial muscles, causing her to smile.
c. sensory receptors in the baby’s ears sent a signal to her brain, which then sent a signal to her facial muscles, causing her to smile.

Explanation:

The toy produces a song (sound), so sensory receptors in the ears detect it. Sensory signals go to the brain first, which processes the input and sends a signal to facial muscles to smile—this is the standard sensory-motor pathway.

Answer:

C. Sensory receptors in the baby's ears sent a signal to her brain, which then sent a signal to her facial muscles, causing her to smile.