Open-Access EEG data of Conditional Discrimination:

Article title: Conditional Discrimination of Electroencephalogram Alpha Amplitudes in Humans
Journal: Journal of the Experimental Analysis of Behavior
Authors: Toshikazu Kuroda (Corresponding author) & Motoaki Kawanabe

[Abstract]
Conditional discrimination of high and low alpha amplitudes of electroencephalogram by humans was demonstrated in the 1950s. Despite several attempts, the original finding was only replicated once, but discrimination accuracy in the replication was only slightly above chance level and confounds may have contributed to it. Potential confounds included a systematic difference in time to exceed thresholds for high and low amplitudes (i.e., temporal cue), unequal numbers of high- and low-amplitude trials, and short trial durations that allowed for correct choices in a preceding trial to serve as a cue for the next trial due to gradual shifts in alpha amplitude. In the current study, we modified the procedure for eliminating these confounds: Participants observed a bar motion corresponding to changes in alpha amplitude for a constant duration. The direction of the bar motion (up and down) was positively or negatively correlated with the amplitude depending on the trial, and the participant’s task was to discriminate the two types of trials. Three of five evaluable participants (60%) showed alpha discrimination without the above confounds and this success rate was similar to the original study. Thus, alpha discrimination appears to be a replicable phenomenon.

[Usage of Agreement]
We invite investigators to apply for access to these data. Before applying your request, please read the privacy statement. The EEG data is allowed to use for noncommercial purpose only. You are asked to email with the subject line “Request for atr-EfP-2025 Dataset Usage Permission” to () by email attached a form of Data Usage Agreement (WORD form) after filling your information and requirements.

History of update

• [2026-07-03] Release EEG data.