LATERALIZED DUAL-TASK INTERFERENCE IN LEFT-HANDERS - INITIAL-VALUE DIFFERENCES DO NOT AFFECT THE OUTCOME

The study was conducted to clarify factors involved in dual-task finge r-tapping interference. Left-handers, as assessed by hand-writing pref erence and left-hand baseline tapping advantage, tapped both alone and while solving anagrams. Even though the left-hand baseline tapping ad vantage was experimentally removed on some (adjusted) trials, greater left- than right-hand tapping interference was observed during concurr ent task performance. This result coupled with previous findings for r ight-handed subjects [Kee and Cherry, Neuropsychologia, Vol. 28, pp. 3 13-316, 1990] indicates that lateralized interference effects are not merely due to initial baseline tapping differences as proposed by Will is and Goodwin [Neuropsychologia, Vol. 25, pp. 719-724, 1987].