Amplitude modulated transcranial alternating current stimulation (AM-TACS) efficacy evaluation via phosphene induction

Abstract

Amplitude modulated transcranial alternating current stimulation (AM-tACS) is a novel method of
electrostimulation which enables the recording of electrophysiological signals during stimulation,
thanks to an easier removable stimulation artefact compared to classical electrostimulation methods.
To gauge the neuromodulatory potential of AM-tACS, we tested its capacity to induce phosphenes as
an indicator of stimulation efficacy. AM-tACS was applied via a two-electrode setup, attached on FpZ
and below the right eye. AM-tACS waveforms comprised of different carrier (50 Hz, 200 Hz, 1000 Hz)
and modulation frequencies (8 Hz, 16 Hz, 28 Hz) were administered with at maximum 2 mA peakto-
peak stimulation strength. TACS conditions in the same frequencies were used as a benchmark
for phosphene induction. AM-tACS conditions using a 50 Hz carrier frequency were able to induce
phosphenes, but with no difference in phosphene thresholds between modulation frequencies.
AM-tACS using a 200 Hz or 1000 Hz carrier frequency did not induce phosphenes. TACS conditions
induced phosphenes in line with previous studies. Stimulation effects of AM-tACS conditions were
independent of amplitude modulation and instead relied solely on the carrier frequency. A possible
explanation may be that AM-tACS needs higher stimulation intensities for its amplitude modulation
to have a neuromodulatory effect.