I found this paper A Radically New Theory of how the Brain Represents and Computes with Probabilities (by Rod Rinkus, Neurithmic Systems & Brandeis University). The terminology the author uses isn’t exactly the same used in the HTM community. However, from what I understood, this theory is similar to the HTM theory (e.g. the usage of the SDRs and the binary nature of neuron spikes).
Furthermore, in the “acknowledgement” section the author writes
I’d like to thank the people who have encouraged me to pursue this theory over the years, including
Dan Bullock, Jeff Hawkins, John Lisman, Josh Alspector, Tom McKenna, Andrew Browning, and Dan
For now, I do not plan to read this paper, and so I will not try to compare this theory to the HTM theory, but, if someone is interested, I think it would be useful and interesting task to do so, at least the salient differences or key points of the “Sparsey” network.