Lesson Summary Students investigate how practice effects response time.  They repeat the part 1 investigations after several sessions of practice. Teacher Background Response time is the length of time it takes for a person to respond to a stimulus.  Practice increases muscle strength and reinforces neural pathways.  Many factors can influence response time.  Sickness, poor conditioning, fatigue, and drugs can slow response time. Set-up/Management Tips Have response sheet ready for assessment at the end of activity. Literacy Support Books Available Through VAST Mediagraphies: (see Literacy Links) Science Stories Smart Training Scientific Vocabulary The following words are key vocabulary words that will be introduced in this lesson and reinforced throughout the unit: No new vocabulary.