Why tACS?

Learn about transcranial Alternating Current Stimulation

What is tACS?

tACS sinewave

tACS is a fancier type of brain stimulation.

With tACS, the electrical current increases and decreases like a wave function. Compare this to tDCS which has a contsant current level.

tACS researchers use specific frequencies of tACS stimulation to influence known brainwaves e.g. Alpha waves, Gamma waves

0.5 - 3 Hz
Delta Waves

Delta waves are very slow. Most typically seem during sleep.

δ-tACS

4 - 8 Hz
Theta Waves

Theta waves occur during early sleep stages.

θ-tACS

8 - 12 Hz
Alpha Waves

α-tACS

12 - 30 Hz
Beta Waves

β-tACS

30+ Hz
Gamma Waves

New interest in studying higher Gamma Wave activity.

γ-tACS

Below Delta is the Infra-Low range at 0 – 0.5Hz, also known as Slow-Cortical Potentials. 

tACS Studies by Frequency

0.75
Hz
so-tDCS

Slow oscillating unipolar tACS for memory consollidation.

6
Hz
Effects of Transcranial Alternating Current Stimulation on Cognitive Functions in Healthy Young and Older Adults

The few research studies that have investigated tACS-induced effects on higher-order cognitive performance in healthy young adults to date suggest a performance-enhancing effect of theta-tACS or gamma-tACS over frontal and parietal areas.

[link]

Theta
Effects of Theta Transcranial Alternating Current Stimulation Over the Frontal Cortex on Reversal Learning.

Theta oscillations in the electroencephalogram (EEG) are associated with learning and behavioral adaptation. Results provide behavioral and electrophysiological evidence for influencing reversal learning with exogenous oscillatory electric field potentials applied to the frontal cortex.

[link]

10
Hz
α
IAF
Orchestrating neuronal networks: sustained after-effects of transcranial alternating current stimulation depend upon brain states

The interest in transcranial alternating current stimulation (tACS) has significantly increased in the past decade. It has potential to modulate brain oscillations in a frequency specific manner, offering the possibility to demonstrate a causal nature of oscillation behavior relationships.

[link]

40
Hz
Lucid Dreaming
γ
The effect of γ-tACS on working memory performance in healthy controls.

Our findings indicated the presence of a selective improvement in performance on the 3-back task following γ-tACS compared with tDCS and sham stimulation. [link]

936
Hz
3rd Eye Pineal Gland

Open your 3rd eye [link]

tACS Stimulator

The Foc.us V3 can stimulate at all of these frequencies

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