Modulating Spatial Processing During Goal-directed Navigation Using Transcranial Magnetic Stimulation
Rutgers, The State University of New Jersey
Summary
Our specific aim is to examine the effects of TMS on spatial processing during goal-directed navigation. In these experiments the investigators will utilize a scalp-recorded brain oscillation called right posterior theta that is believed to index the sensitivity of the parahippocampal cortex to spatial context. Here the investigators will asked whether this electrophysiological signal can be modulated up or down using TMS while participants engage in virtual navigation tasks, and if so, whether it would affect the spatial encoding of rewards and subsequent choices during task performance.
Description
The design is primarily a randomized control-trial design (3 sessions), testing the effects of 10-Hz rTMS and single-pulse TMS on spatial processing during goal-directed navigation tasks. Subjects will be randomly assigned to an active or sham group. All participants will be asked to complete two TMS sessions within two weeks. For the active TMS group, participants will be scanned using a 3 Tesla MRI system and will receive a structural (T1) and diffusion-weighted imaging (DWI) scan (Session A). For each subsequent TMS session, the TMS coil will be placed 1cm above the scalp over a right parie…
Eligibility
- Age range
- 18–55 years
- Sex
- All
- Healthy volunteers
- Yes
Inclusion Criteria: 1. Be between the ages of 18 and 55 years old. 2. Not received substance abuse treatment within the previous 30 days. 3. Be in stable mental and physical health. 4. If female, test non-pregnant. 5. No evidence of focal or diffuse brain lesion on MRI. 6. Be willing to provide informed consent. 7. Be able to comply with protocol requirements and likely to complete all study procedures. Exclusion Criteria: 1. Contraindication to MRI (e.g., presence of metal in the skull, orbits or intracranial cavity, claustrophobia). 2. Contraindication to rTMS (history of neurological dis…
Interventions
- DeviceActive 10-Hz TMS to the parietal cortex
The active 10-Hz TMS group will receive 10hz TMS stimulation in the first TMS session, and single pulse TMS in the second TMS session. Participants in the active stimulation group will receive 10-Hz TMS to right parietal cortex. The TMS target will be based on subject specific anatomical MRI images (diffusion imaging). TMS will be delivered using a robotic neuronavigation system (Smartmove, ANT). Stimulation intensity will be standardized at 110% of RMT and adjusted to the skull to cortical surface based on e-field calculations (simnibs). Stimulation will be delivered to the right parietal cortex using an active/placebo figure-8 coil, an magventure TMS device.
- DeviceActive single pulse TMS to the parietal cortex
The active single pulse TMS group will receive single pulse TMS stimulation in the first and second TMS session. Participants in the active stimulation group will receive single pulse TMS to right parietal cortex. The TMS target will be based on subject specific anatomical MRI images (diffusion imaging). TMS will be delivered using a robotic neuronavigation system (Smartmove, ANT). Stimulation intensity will be standardized at 110% of RMT and adjusted to the skull to cortical surface based on e-field calculations (simnibs). Stimulation will be delivered to the right parietal cortex using an active/placebo figure-8 coil, an magventure TMS device.
- DeviceSham 10-Hz TMS to the right parietal cortex
The parameters in the active arms will be as above with the internal randomization of the device internally switching to sham in a blinded fashion.
Location
- Rutgers University - NewarkNewark, New Jersey