Sounds promising
But when do I get my maths co-processor?
Scientists affiliated with the University of Massachusetts Amherst have developed an artificial neuron that can communicate efficiently with biological neurons, a research advance expected to accelerate the development of bioelectronic devices and interfaces. Neurons are nerve cells that transmit and receive electrical signals …
Hmmmm ... I'd say, either, 1) you're not generating enough sweat for the Geobacter sulfurreducens to produce the juice needed to power the coprocessor -- watching more of stimulating web content should help there; or, 2) the pilin-gene bacterial nanowire electronic nose may be shutting down the artificial neuron memristor that connects the coproc to your brains (out of an abundance of caution; viz potential social interactions) -- in which case you need to take a couple showers, and then rebuild your sweatiness levels back up with stimulating stuff.
It's biological tech ... it's messy (and sometimes stinks too!)! ;)
Maybe your brain is a Human Brain SX where the math co-processor is disabled. You simply need to place the co-processor (actually a Human Brain DX with a different label) in the empty skull beside your pre-installed Human Brain SX. This will actually disable your Human Brain SX and take over all operations.
If your manufacturer didn't fit the empty skull, the upgrade is impossible.