Brain Encoding for Memory

Study Summary

This two-part study will use transcranial magnetic stimulation, or TMS (see below), to explore how the brain forms memories. People remember only some of the events they experience every day, such as faces they perceive, words they read, speech they hear and interpret, and so forth. The events remembered are those that have been saved or formed in the brain. Part 1 of this study involves testing materials for Part 2, the TMS experiment. Part 2 uses TMS to examine what parts of the brain are involved in forming memories. Information gained from this study may be used in developing methods of enhancing memory in both healthy people and in patients with memory impairments. Healthy right-handed volunteers between 18 and 35 years of age may be eligible for this study. Candidates may be screened with a medical interview and physical examination and a brief test of short- and long-term visual and verbal memory. Eligible volunteers may participate in Part 1 or Part 2 of the study, as follows: Part 1 - Preparation of Words and Picture Materials Participants look at several words or shapes that appear in random order on a computer screen and try to remember them as well as possible for a memory test that will be given 20 minutes later. Each image appears on the screen for 3/4 of a second, with 1-1/4-second intervals between them. For the test, words and shapes are again shown on the computer screen at the same timing and intervals. When the items appear, the subject presses one of three buttons as quickly as possible, determining if he or she has recognized the items with a high or low level of confidence. The entire procedure lasts up to 1 hour, with breaks in between. The purpose of this experiment is to find appropriate words and pictures to use as stimuli in the TMS study described below. Part 2 - TMS Experiment For TMS, the subject sits in a comfortable chair. An insulated wire coil is placed on the scalp, and brief electrical currents are passed through the coil, c

Interventions

• DEVICE Magstim Rapid Magnetic Stimulator