Age-related changes in the allocation of spatially directed focal attention
Aleksandra Mańkowska1, Kenneth M Heilman2,3, John B Williamson3,4
1Division of Clinical Psychology and Neuropsychology, Institute of Psychology, Department of the Social Sciences, University of Gdańsk , Gdansk, Poland.
Objectives:
Leftward deviation on a horizontal line bisection test (pseudoneglect) might be induced by right hemispheric dominance for mediating spatial or global attention, or a hemispheric asymmetry in the ability to spatially disengage attention. With aging, this leftward bias is reduced, likely due to the aging-related deterioration of right hemisphere mediated functions (right hemi-aging) or hemispheric asymmetry reduction in old adults (HAROLD).
Methods:
Forty-seven healthy adults divided into younger and older groups performed a modified Posner spatial-attentional task.
Results:
Overall, younger individuals responded faster to left than right-sided imperative stimuli. In contrast, older participants did not reveal a right-left asymmetry to imperative stimuli. The younger group also revealed a strong inverse relationship between the reaction time to right valid cues and the leftward attentional bias while performing the line bisection task (pseudoneglect).
Conclusions:
Our results provide support for both the right hemisphere spatial-attentional dominance hypothesis of pseudoneglect and the right hemi-aging hypotheses.
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