  Surface electrical potential and observational growth recordings were made of
a protoplasmic tube of the slime mould Physarum polycephalum in response to a
multitude of stimuli with regards to sensory fusion or multisensory
integration. Each stimulus was tested alone and in combination in order to
evaluate for the first time the effect that multiple stimuli have on the
frequency of streaming oscillation. White light caused a decrease in frequency
whilst increasing the temperature and applying a food source in the form of oat
flakes both increased the frequency. Simultaneously stimulating P. polycephalum
with light and oat flake produced no net change in frequency, while combined
light and heat stimuli showed an increase in frequency smaller than that
observed for heat alone. When the two positive stimuli, oat flakes and heat,
were combined, there was a net increase in frequency similar to the cumulative
increases caused by the individual stimuli. Boolean logic gates were derived
from the measured frequency change.
