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Description: Below you can see and download the preprocessed (band-pass filtered 0.1–200 Hz and notch-filtered at 50 Hz), epoched (around both stimulus and response) EEG data of the project in ".mat" format readable in Matlab. "chan_locations" provide channel labels. "EEG_signals" provide the data samples for the 64 channels aligned to the stimulus onset time (row=1) and response time (row=2) for session 1 (column =1) and session 2 (column =2) for the 240 stimuli presented to the participant. The sampling frequency is 1000 Hz and the simulus-aligned data show the samples from -500 to 1499 ms after the stimulus onset time and response-aligned data show the samples from -1499 before to 500 ms after the response time. * There is only one session of data for subject #13. "Exp_data" provides all the information about the screen, stimuli and the participants' responses for the two sessions (columns). "ResponseData" within "Exp_data" provides information about each presented stimulus and response for every trial. Rows of "ResponseData.Values" are the participant's reaction time, correct/incorrect responses (1/0), the button pressed (in ASCII format), the level of simulus coherence (0.22,0.30,0.45,0.55) and stimulus category (unfamiliar=1; famous=2; self=3; personally familiar=4). Please contact us if you have any questions at: hkarimi265@gmail.com ghodrati.masoud@gmail.com Please cite as: Hamid Karimi-Rouzbahani, Farzad Ramezani, Alexandra Woolgar, Anina Rich, Masoud Ghodrati, "Perceptual difficulty modulates the direction of information flow in familiar face recognition", NeuroImage, Volume 233, 2021, 117896.