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Results: 5

1.
Figure 3

Figure 3. Motor Physiological Measurements.. From: Electronically Switchable Sham Transcranial Magnetic Stimulation (TMS) System.

Subject motor thresholds are plotted for Standard and Reversed TMS through the Fig8 or Circ coil. Sham stimulation did not elicit muscle potentials even at maximum settings, thus threshold is beyond 100% stimulator output and not plotted.

Fumiko Hoeft, et al. PLoS ONE. 2008;3(4):e1923.
2.
Figure 1

Figure 1. Modeled Electric fields of Standard and Sham TMS with Fig8 (A) and Circ (B) coils.. From: Electronically Switchable Sham Transcranial Magnetic Stimulation (TMS) System.

Electric field for x (top panel) and y (middle panel) axes and strength (bottom panel) are plotted as both color and height on the 3-d images and sas color on the 2-d images. Black circles indicate approximate locations of peaks when commercially available coils are used (Fig8: within annulus, Circ: between the two circles).

Fumiko Hoeft, et al. PLoS ONE. 2008;3(4):e1923.
3.
Figure 4

Figure 4. Perceptual Discrimination.. From: Electronically Switchable Sham Transcranial Magnetic Stimulation (TMS) System.

Ability of five naive subjects (Sj1–Sj5; white bars) and two non-naïve investigators (Iv1, Iv2; red bars) to discriminate between stimulus conditions, expressed in terms of d' statistic (higher d' = greater discriminability). Discriminability between Real (Standard or Reversed) vs. Sham TMS through the Fig8 coil with stimulator at 70 and 90% of maximum stimulator output, and through the Circ coil at 50%. Also, discriminability between Standard and Reversed in the Circ coil with stimulator at 90%.

Fumiko Hoeft, et al. PLoS ONE. 2008;3(4):e1923.
4.
Figure 5

Figure 5. Loudness and Pain Sensation and Sound Levels.. From: Electronically Switchable Sham Transcranial Magnetic Stimulation (TMS) System.

Subjective ratings for loudness (A) and for pain (B) from three naïve subjects for the three stimulus types. Stimulator was set at 90%. Ratings for stimuli from commercially available coils are included as reference. (C) Maximum sound pressure levels of the same stimuli. Error bars represent standard error of the mean. Comparisons with significant difference are marked with asterisks.

Fumiko Hoeft, et al. PLoS ONE. 2008;3(4):e1923.
5.
Figure 2

Figure 2. Electromagnetic force (EMF) measurements of Standard, Reversed and Sham TMS with Fig8 and Circ coils.. From: Electronically Switchable Sham Transcranial Magnetic Stimulation (TMS) System.

(A) Effects of 1st pulse on 2nd pulse. Two consecutive pulses were delivered at 10 ms interstimulus interval (ISI) at 50% maximum output and EMF was measured. All EMF values are normalized to the 1st pulse. (B) Effects of distance, intensity and position. B-1. EMF measured at varying distances between custom Fig8 or Circ coils and search coil. Values are normalized to those of Standard TMS at 10 mm. B-2. EMF measured at varying TMS intensity with custom Fig8 and Circ coils. Values are normalized to those of Standard TMS at 50% maximal output. For clarity, all plots show data for Reversed pulses as inverted and collapsed with data for Standard pulses, as they showed no significant differences beside their polarities.

Fumiko Hoeft, et al. PLoS ONE. 2008;3(4):e1923.

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