Participants in this group will be between the ages of 7 and 18 years old and have a diagnosis of cerebral palsy. Amadeo will be used to train the more-affected hand of participants in this group. The training will last approximately 1 hour per day for 14 successive days. Participants will be asked to first do active finger and passive finger moving, then receive haptic vibration, and finally play interactive games.

Participants in this group will be between the ages of 7 and 18 years old and have a diagnosis of cerebral palsy.

Participants in this group will be between the ages of 7 and 18 years old and have no history of neurological disorder or brain injury. Amadeo will be used to train the non-dominant hand of participants in this group. The training will last approximately 1 hour per day for 14 successive days. Participants will be asked to first do active finger and passive finger moving, then receive haptic vibration, and finally play interactive games.

Participants in this group will be between the ages of 7 and 18 years old and have no history of neurological disorder or brain injury.

Amadeo® is an FDA Class I Exempt hand/finger robot that has the capacity to precisely measure hand/finger functions.

To use Amadeo, a participant will be seated in a chair. The height of the robot arm support will be adjusted to achieve a comfortable position for the participant. One of the participant's arms will be will be placed on the robot arm support. Magnetic finger tips will then be attached to fingers and thumb. After this, fingers and thumb will be connected to the robot finger sliders. To use Amadeo, the movement range and maximal force of each finger will be configured according to the finger's capability. The following four types of function assessments will be performed with Amadeo: Force, range of motion, tone, and spasticity. Each session will last approximately one hour.

A high-density EEG net placed on participant's heads will be connected to the EEG recording device that measures the electrical potential generated by the participant's brain and recorded on the participant's scalp. After the net is placed on the head, extra leads are placed on the body for measuring electro-cardiography (ECG), electro-oculography (EOG), and electro-myography (EMG).

Three tasks will be performed with simultaneous HD-EEG recording in each assessment session on the robot: one is active and passive movements of fingers with the robot; another is robotic vibration of fingers; the third is interactive game playing with the robot. The entire HD-EEG session will last up to 1.5 hours, and the participants will be given multiple breaks throughout the session.

Somatosensory and motor evoked responses will be collected and quantified in the form of signal amplitude, power frequency, and localization.

TMS is a noninvasive procedure that uses magnetic fields to stimulate nerve cells in the brain in order to map the motor cortex. During the TMS session, the participant will lay down comfortably in a specially designed armchair. The operator will initially place a band around the participant's head that is used for coregistering the participant's anatomy with respect to the location of the TMS coil.

MRI produces three-dimensional detailed anatomical image of the human brain. The imaging protocol will consist of structural MRI (T1), diffusion MRI (dMRI), and resting-state functional MRI (rs-fMRI) sequences. Scans will be performed on a 3T Siemens Tim Trio (Siemens Healthcare, USA). The entire data collection session will last ~30 min.

This assesses manual dexterity by measuring the time a child needs to transfer 25 cylindrical metal pegs in to 25 holes. The measurement is transfer time in seconds.