Reading upside down and mirror text in groups differing for right minus left hand skill

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Abstract
Undergraduates were assessed for their ability to read normal, inverted and mirror text, and for their hand preference and peg moving time by each hand. The first prediction was that the advantage of the right hand for skill depends on loss of left hand skill, rather than gain in right hand skill. There was strong support for this idea. The second prediction was that there are risks for abilities at both extremes of the continuum of differences in hand skill, but especially at the right. The expected pattern was clearly present for inverted reading. The trends for normal and mirror reading were similar but not significant. The results replicate those for hand skill and reading quotient in normal schoolchildren (Annett & Manning, 1990b). Both studies support the suggestion that reading is one of the skills influenced by a genetic balanced polymorphism with heterozygote advantage, for laterality and ability.

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