TY  - JOUR
PY  - 2005//
TI  - Is "left" always where the thumb is right?: stimulus-response compatibilities as a function of posture and location of the responding hand
JO  - Cognitive and behavioral neurology
A1  - Leuthard, Jurg
A1  - Bächtold, Daniel
A1  - Brugger, P.
SP  - 173
EP  - 178
VL  - 18
IS  - 3
N2  - OBJECTIVE: To determine hand-centered coordinate systems for left-right discriminations in representational space, including scenes imagined behind one's head ("backspace"). METHOD: Thirty-two healthy men responded with the index or ring finger of their right (dominant) hand to numbers presented in the center of a screen. These indicated hours on the right or left half of a clock face. A decision "earlier or later than six o'clock?" was required. There were 4 response conditions: (1) pronated and (2) supinated hand in frontspace and (3) pronated and (4) supinated hand in backspace. RESULTS: "Left" and "right" were reliably and differentially associated with the 2 different fingers for all conditions except the pronated hand in backspace (conflict between body-centered and hand-centered reference frames). When backspace trials were analyzed as a function of individual strategies of the localization of the imaginary clockface (ie, around the stimulus number in frontspace versus around the response hand in backspace), it was found that the 2 strategies were associated with opposite right/left assignments. CONCLUSIONS: Together, these results indicate relatively universal left/right assignments to the fingers of a hand held in canonical postures and interindividually variable (but intraindividually consistent) assignments for less canonical postures. The task appears suitable for the quantification of representational neglect, especially in backspace.<p />  <p>Language: en</p>
LA  - en
SN  - 1543-3633
UR  - http://dx.doi.org/
ID  - ref1
ER  -