# Behavioral data - N = 77 - subject 4 incomplete data: only 270 trials - but subject 4 didn't pass criterion 1 anyway - subject 17 only has 104 epochs (didn't complete task) - 51 passed criterion 1 (90% grip success) - 42 passed criterion 2 (non-extreme choices: 10% and 90%) # Design matrix - subject 17 doesn't have behavioral data, so cannot produce design matrix file ## Preregistered exclusion criteria Participant exclusions, artifact removal, and data organization for statistical tests occurred in the following ordered steps: 1. Participant data will be excluded based on the success rates of effort production (i.e., squeezing the hand-dynamometer that reaches a given effort level for a given period of time). If participants fail to produce the required effort successfully on more than 10% of the trials, their data will be excluded from analyses entirely. High success rates of effort production in the task is important; to measure RewP amplitude, both reward and no-reward feedback need to occur approximately with similar frequency (because expectation of feedback occurrence modulates RewP amplitude). 2. If a participant selects the baseline choice or the effort offer on more than 90% or less than 10% of the trials, we plan to exclude data from these participants entirely from all analyses. 3. The entire dataset of a participant will be removed based on EEG artifact rejection criteria (which includes excessive motor artifacts). If more than 30% of the trials contain artifacts overall across conditions, data of this participant will be excluded entirely from the analyses. As noted in the Participants and Power section, if the number of eligible participants fall below 65 (as per our power analysis) because of this exclusion criterion, we will additionally collect more data. 4. For RewP amplitude, the minimum number of trials for average will be 15 in both the reward and no-reward feedback conditions for each effort and reward level. For FMT power, the minimum number of trials for average will be 15 for each effort and reward level. If these criteria are not met, participants’ RewP and FMT data will be excluded. # Registered power simulations ![[simulations.jpg|800]]