Article Figures & Data
Figures
- Figure 1.
Somatosensory stimuli administered during ischemic compression nerve block. A, Gentle brushing was administered with at a rate of 3 cm/s using a soft goat hair watercolor brush. B, Deep pressure was administered using a commercially available hand massager. C, Vibration sensation was tested using a custom vibration device at 200 Hz. D, Perception of warmth was tested using a Medoc thermode.
- Figure 2.
Somatosensory stimuli administered during nerve compression block. A, Gentle brushing was administered with at a rate of 3 cm/s using a soft goat hair watercolor brush. B, Deep pressure was administered using a commercially available hand massager. C, Vibration sensation was tested using a custom vibration device at 200 Hz. D, Perception of cold and warmth were tested using a QST.Lab T09 thermode.
- Figure 3.
Effect of afferent A-fiber block on intensity and pleasantness of gentle brushing. The intensity and pleasantness of slow gentle brushing on the hand or arm was rated after ischemic or compression nerve block, on sufficient loss of A-fiber associated sensation. Participants who met all preestablished criteria for nerve fiber separation and maintained the criteria after affective testing are labeled “full responders”; participants whose warmth perception rose >1°C or who did not maintain all criteria directly after the brushing task are labeled “partial responders.” For pleasantness ratings, negative numbers indicate unpleasantness.
- Figure 4.
Effect of afferent A-fiber block on intensity and pleasantness of deep pressure. The intensity and pleasantness of deep pressure was rated after ischemic or compression nerve block, on sufficient loss of A-fiber associated sensation. Participants who met all preestablished criteria for nerve fiber separation and maintained the criteria after affective testing are labeled “full responders”; participants whose warmth perception rose >1°C or who did not maintain all criteria directly after the brushing task are labeled “partial responders.” For pleasantness ratings, negative numbers indicate unpleasantness.
Tables
Data structure Type of test Power/Effect size a Non-normal Linear mixed effects model Cohen’s d = 0.55 b Non-normal Linear mixed effects model Cohen’s d = 0.91 c Non-normal Linear mixed effects model Cohen’s d = 1.6 d Non-normal Linear mixed effects model Cohen’s d = 1.7 e Non-normal Linear mixed effects model Cohen’s d = 1.35 f Non-normal Linear mixed effects model Cohen’s d = 1.92 g Non-normal Linear mixed effects model Cohen’s d = 1.33 h Non-normal Linear mixed effects model Cohen’s d = 1.92 i Non-normal Pearson’s correlation
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