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Table 1 Percentages of right- and left-handers with speech localised predominantly in the left, right hemisphere, or bilaterally, according to different studies and techniques

From: Electroconvulsive therapy and determination of cerebral dominance

Study Right-handers Left-handers
  Left Bilateral Right Left Bilateral Right
Milner, 1975* 96 0 4 70 15 15
Rossi & Rosadini, 1967* 99 1 0 40 10 50
Pratt & Warrington, 1972# 99 0 1 - - -
Warrington & Pratt, 1973# - - - 70 7 23
Geffen et al., 1978# 92 0 8 67 0 33
Geffen & Traub, 1979 84 9 7 61 15 24
Springer et al. 1999& 94 6 0 - - -
Pujol et al. 1999& 96 4 0 76 14 10
Szaflarski et al. 2002& - - - 78 14 8
Hund-Georgiadis et al. 2002& 94 0 6 47 12 41
Knecht et al. 2000 - - 4 - - 27
  1. * intracarotid sodium amytal test
  2. # ECT
  3. dichotic listening test
  4. &fMRI
  5. fTCD