A lateralized bias in mental imagery: Evidence for representational pseudoneglect

One hundred right-handed healthy individuals were asked to imagine a familiar scene (the Piazza del Duomo, Milan) from two opposite viewpoints and report what they could see. For elements that should be visible from the participants' viewpoint, more elements were reported from the left side of the image than from the right, irrespective of view. These results establish that there is a lateralized bias in reporting the details in mental images--representational pseudoneglect. This bias is in the opposite direction and significantly smaller than the bias seen in individuals with representational neglect following right hemisphere damage. Representational pseudoneglect appears analogous to perceptual pseudoneglect and the two may share an underlying mechanism. The results are interpreted as indicating that pseudo-representational neglect arises as the result of a bias in the allocation of attention to the imagined scene.

[1]  P. Garthwaite,et al.  Investigation of the single case in neuropsychology: confidence limits on the abnormality of test scores and test score differences , 2002, Neuropsychologia.

[2]  P Bartolomeo,et al.  [Presenting a battery for assessing spatial neglect. Norms and effects of age, educational level, sex, hand and laterality]. , 2001, Revue neurologique.

[3]  M. McCourt,et al.  Pseudoneglect: a review and meta-analysis of performance factors in line bisection tasks , 2000, Neuropsychologia.

[4]  M. Kinsbourne.  The cerebral basis of lateral asymmetries in attention. , 1970, Acta psychologica.

[5]  E. Bisiach,et al.  Mental Representation in Unilateral Neglect and Related Disorders: The Twentieth Bartlett Memorial Lecture , 1993, The Quarterly journal of experimental psychology. A, Human experimental psychology.

[6]  Kenneth M. Heilman,et al.  Hemispace and Hemispatial Neglect , 1987 .

[7]  K. Heilman,et al.  Pseudoneglect: Effects of hemispace on a tactile line bisection task , 1980, Neuropsychologia.

[8]  M. McCourt,et al.  Unilateral Visual Cueing and Asymmetric Line Geometry Share a Common Attentional Origin in the Modulation of Pseudoneglect , 2005, Cortex.

[9]  Anne-Catherine Bachoud-Lévi,et al.  Time to imagine space: a chronometric exploration of representational neglect , 2005, Neuropsychologia.

[10]  F. V. Eynde.  The levels of representation , 1986 .

[11]  Alfonso Caramazza,et al.  Levels of representation, co-ordinate frames, and unilateral neglect , 1990 .

[12]  K. Seki,et al.  Approaches to Subjective Midpoint of Horizontal Lines in Unilateral Spatial Neglect , 2006, Cortex.

[13]  S. Sala,et al.  Pseudoneglect in back space , 2007, Brain and Cognition.

[14]  M. Çiçek,et al.  Magical Ideation and Right-Sided Hemispatial Inattention on a Spatial Working Memory Task: Influences of Sex and Handedness , 2000, Perceptual and Motor Skills.

[15]  M. Moscovitch,et al.  Hemispheric control of spatial attention , 1990, Brain and Cognition.

[16]  A. Greenwald.  LEVELS OF REPRESENTATION , 1988 .

[17]  M. Nicholls,et al.  The Effect of Body and Environment-Centred Coordinates on Free-Viewing Perceptual Asymmetries for Vertical and Horizontal Stimuli , 2006, Cortex.

[18]  Peter McGeorge,et al.  Hemispatial asymmetries in judgment of stimulus size , 2007, Perception & psychophysics.

[19]  M. Jeannerod.  Neurophysiological and neuropsychological aspects of spatial neglect. , 1987 .

[20]  Robert H. Logie,et al.  Visual perception and verbal descriptions as sources for generating mental representations: Evidence from representational neglect , 2002, Cognitive neuropsychology.

[21]  E. Bisiach,et al.  Unilateral Neglect of Representational Space , 1978, Cortex.

[22]  Marika Urbanski,et al.  Line bisection in left neglect: The importance of starting right , 2008, Cortex.

[23]  H. Bracha,et al.  The relationship between leftward turning bias and visuospatial ability in humans. , 1992, The International journal of neuroscience.

[24]  D. Perani,et al.  Brain and conscious representation of outside reality , 1981, Neuropsychologia.

[25]  P. McGeorge,et al.  Lateral bumping: A normal-subject analog of the behaviour of patients with hemi-spatial neglect? , 1998 .

[26]  Sylvia M. L. Cox,et al.  Is susceptibility to perceptual migration and fusion modality-specific or multimodal? , 2006, Neuropsychologia.

[27]  Michel Denis,et al.  Preserved visuo-spatial transformations in representational neglect , 2004, Neuropsychologia.

[28]  M. Kinsbourne.  Mechanisms of Unilateral Neglect , 1987 .

[29]  K M Heilman,et al.  Remote memory and neglect syndrome , 1987, Neurology.

[30]  T Landis,et al.  Human side preferences in three different whole-body movement tasks , 2004, Behavioural Brain Research.

[31]  S. Folstein,et al.  "Mini-mental state". A practical method for grading the cognitive state of patients for the clinician. , 1975, Journal of psychiatric research.

[32]  L. Regolin.  The Case of the Line-Bisection: When Both Humans and Chickens Wander Left , 2006, Cortex.