Using objects such as mirrors or video recordings as they practice can show speakers what they look and sound like to the audience.

The researchers analyzed video recordings of 53 child-parent pairs during everyday activities at home and found children who play with puzzles between 26 and 46 months of age have better spatial skills when assessed at 54 months of age.

To authorize others to make sound recordings and video recordings for commercial purposes, and to receive remuneration therefor.