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Table 2 Number of subjects categorized by type and location of tactile sensations across different sonication conditions

From: Simultaneous acoustic stimulation of human primary and secondary somatosensory cortices using transcranial focused ultrasound

Types of sensations Sonication conditions
SIFUS SIIFUS SI/SIIFUS
(a)    
Tingling 7/9 78% 7/9 78% 6/9 67%
Heaviness/pressure 2/9 22% 2/9 22% 1/9 11%
Numbness 3/9 33% 4/9 44% 4/9 44%
Feeling of weak 4/9 44% 5/9 56% 6/9 67%
electrical current flow       
Warmth 2/9 22% 2/9 22% 1/9 11%
Coolness 0/9 0% 1/9 11% 0/9 0%
Vibrotactile 1/9 11% 0/9 0% 2/9 22%
Brushing 1/9 11% 0/9 0% 0/9 0%
Locations of sensations Sonication conditions
SIFUS SIIFUS SI/SIIFUS
(b)    
Hand/finger(s) 7/9 78% 8/9 89% 7/9 78%
Wrist 1/9 11% 3/9 33% 2/9 22%
Forearm 3/9 33% 3/9 33% 3/9 33%
Elbow 2/9 22% 2/9 22% 5/9 56%
Arm 1/9 11% 1/9 11% 1/9 11%
Leg 3/9 33% 0/9 0% 0/9 0%
  1. The number of subjects categorized (a) according to the types of reported sensation descriptors and (b) the locations of sensations across three sonication conditions (SIFUS, SIIFUS, and SI/SIIFUS) out of 9 responsive subjects (‘h1’–‘h9’). Detailed information of the elicited sensations from each subject can be found in Additional file 1: Tables S1–S3