Hot off the presses:
https://scitechdaily.com/mit-neuroscientists-demonstrate-controlling-attention-with-brain-waves/
>In a new study, the researchers found that people can enhance their attention by controlling their own alpha brain waves based on neurofeedback they receive as they perform a particular task.

https://doi.org/10.1016/j.neuron.2019.11.001
>Subjects learn to control alpha synchrony in left versus right parietal cortex
>Modulation of alpha synchrony causes a spatial bias in visual processing
>Attentional bias persists even after neurofeedback training
>Alpha synchrony plays a causal role in modulating attention and visual processing

>The results support the proposal that alpha synchrony plays a causal role in modulating attention and visual processing, and alpha training could be used for testing hypotheses about synchrony.

Any neuroscientists in here? I'm hardly qualified to understand the methods and jargon in the paper.
What I get from it is:
- by desynchronizing alpha waves between the left and right parietal lobes, the average amplitude of alpha waves in the brain is reduced
- there's some intricate process where the test subjects train themselves using an MEG and some feedback from software; the subject magically "figures out" how to do it based on the feedback alone

Is there a way to at least try to train this on the cheap, without paying a local clinic thousands for therapy for a potentially dubious outcome?