Theta-burst stimulation (a form of transcranial magnetic stimulation) targeting the right frontal pole.

Participants will receive 5 session per day of TBS for 6 days (30 sessions total). Six treatment days have to occur within a 2 week period. Each session will be comprised of 1800 pulses, using a MagVenture MagPro X100.

The Compulsive Acquisition Scale (CAS) is an 18-item questionnaire that measures the extent to which individuals acquire and feel compelled to acquire possessions.

The total score (sum of 18 items) ranges from 0 to 126. Total score higher than 48 shows significant difficulty with acquiring.

The Saving Inventory-Revised scale (SI-R) is a 23-item questionnaire with 3 factor-analytically defined sub-scales for difficulty discarding, excessive clutter, and compulsive acquisition.

The total score (sum of 23 items) ranges from 0 to 92. Total score higher than 41 shows significant difficulty with clutter.

For the acquisition subscale, items 2 (reverse score), 9, 11, 14, 16, 18 and 21 are summed together. The subscale ranges from 0 to 28 and score greater than 13 indicates difficulty with excessive acquisition.

For the difficulty discarding subscale, items 4(reverse score), 6, 7, 13, 17, 19, 23 are summed together. The subscale ranges from 0 to 28 and score greater than 13 indicates difficulty with discarding.

For the clutter subscale, items 1, 3, 5, 8, 10, 12, 15, 20, 22 are summed together. The subscale ranges from 0 to 36 and score greater than 15 indicates difficulty with accumulated clutter.