In a large well planted aquarium a single pair of emperor tetras will often breed without any extra stimulation.

Some use ginseng as well, for extra stimulation.

Forbidding a child to do dangerous things like playing in a construction site or an abandoned building does not eliminate the child's craving for extra stimulation.

These feelings, when combined with the extra stimulation of ice cream, cake, entertainment and party games, can become overwhelming and some children lose control.

His scientific mind, born at a time of staggering progress, had needed no extra stimulation.

The assertion by Dr. Bruer that no "extra" stimulation is necessary during infant development also appears to be a theory.

Under conditions of extra stimulation, the motor behavior of these children rapidly improved.

I may need a little extra stimulation,' he smiled.

The extra stimulation can override the regular rhythm normally controlled by the right atrium and lead to an abnormal number of heartbeats, he said.

Many textured condoms which advertise "mutual pleasure" also are bulb-shaped at the top, to provide extra stimulation to the male.