Symmetry brings an impression of familiarity but does not improve recognition memory.

Studies have shown that symmetric stimuli are recognized better than asymmetric stimuli but evidence suggests that this advantage may result from a familiarity bias induced by symmetry. We used a classic episodic memory paradigm to test this bias and see if it truly accounts for the symmetry advantage. Subjects first encoded symmetric and asymmetric figures. During a subsequent recognition phase, they discriminated the encoded (old) figures from new intermixed figures. The recognition rate of old figures was higher with symmetric figures than asymmetric figures. However, the tendency to falsely recognize new figures was also higher when they were symmetric, meaning that the higher recognition rate for symmetric figures was artificially inflated by a response bias. Three other experiments further tested this finding and examined the influence of some variables (rotation in virtual 3D space, stimulus meaningfulness, and redundancy of information) on the bias. A fifth experiment with photo stimuli confirmed that the response bias also applies to objects that we regularly encounter in everyday life. In conclusion, our results show that symmetry does not enhance mnemonic processes but instead induces a response bias leading individuals to judge such stimuli as having been seen.

[1]  E. Howe,et al.  Time course of encoding of patterns varying in array size and symmetry , 1989 .

[2]  E. Howe,et al.  Effects of Partial Symmetry, Exposure Time, and Backward Masking on Judged Goodness and Reproduction of Visual Patterns , 1980, The Quarterly journal of experimental psychology.

[3]  R. I. Reynolds,et al.  The Role of Object-Hypotheses in the Organization of Fragmented Figures , 1985, Perception.

[4]  P Wenderoth,et al.  The Salience of Vertical Symmetry , 1994, Perception.

[5]  J. Crumbaugh Temporal changes in the memory of visually perceived form. , 1954, American Journal of Psychology.

[6]  S E Avons,et al.  Representation of matrix patterns in long- and short-term visual memory. , 1987, Acta psychologica.

[7]  Takeo Kanade,et al.  Recovery of the Three-Dimensional Shape of an Object from a Single View , 1981, Artif. Intell..

[8]  Zygmunt Pizlo,et al.  Detection of skewed symmetry. , 2008, Journal of vision.

[9]  J. A. Leonard,et al.  Stimulus correlates of visual pattern recognition: a probability approach. , 1956, Journal of experimental psychology.

[10]  Sabine Kastner,et al.  Symmetry perception in humans and macaques , 2005, Trends in Cognitive Sciences.

[11]  M. Wertheimer,et al.  The retention of "good" and "bad" figures. , 1959 .

[12]  Harcum Er EFFECTS OF SYMMETRY ON THE PERCEPTION OF TACHISTOSCOPIC PATTERNS. , 1964 .

[13]  F. Kuhlmann On the analysis of the memory consciousness: A study in the mental imagery and memory of meaningless visual forms. , 1906 .

[14]  B. Gibson,et al.  Must Figure-Ground Organization Precede Object Recognition? An Assumption in Peril , 1994 .

[15]  A. Baddeley,et al.  Symmetry and binding in visuo-spatial working memory , 2006, Neuroscience.

[16]  F. Attneave Symmetry, information, and memory for patterns. , 1955, The American journal of psychology.

[17]  M. Brodeur,et al.  Seeing is remembering: Do deficits in closure affect visual memory recognition in schizophrenia? , 2008, Cognitive neuropsychiatry.

[18]  I. Rock,et al.  Level of processing in the perception of symmetrical forms viewed from different angles. , 1995, Spatial vision.

[19]  M. Mendelson Attention to quantitative and configural properties of abstract visual patterns by children and adults. , 1984, Child development.

[20]  M Kubovy,et al.  Detection of symmetry and perceptual organization: the way a lock-and-key process works. , 1997, Acta psychologica.

[21]  Rob van Lier,et al.  Global Visual Completion of Quasi-Regular Shapes , 2002 .

[22]  James R. Pomerantz,et al.  Stimules configuration in selective attention tasks , 1973 .

[23]  Marcia K. Johnson,et al.  Memory confusions for real and imagined completions of symmetrical visual patterns , 1988, Memory & cognition.

[24]  J. G. Snodgrass,et al.  Pragmatics of measuring recognition memory: applications to dementia and amnesia. , 1988, Journal of experimental psychology. General.

[25]  Jon Driver,et al.  Edge-Assignment and Figure–Ground Segmentation in Short-Term Visual Matching , 1996, Cognitive Psychology.

[26]  Marian B. Hubbell Configurational Properties Considered 'Good' by Naive Subjects , 1940 .

[27]  Johan Wagemans,et al.  Detection of symmetry and repetition in one and two objects. Structures versus strategies. , 2009, Experimental psychology.

[28]  Barbara Tversky,et al.  Three-Dimensional Bilateral Symmetry Bias in Judgments of Figural Identity and Orientation , 1997 .

[29]  David E. Clement Uncertainty and latency of verbal naming responses as correlates of pattern goodness , 1964 .

[30]  K. Koffka Principles Of Gestalt Psychology , 1936 .

[31]  P. A. van der Helm,et al.  Symmetry and repetition in perspective. , 2005, Acta psychologica.

[32]  Johan Wagemans,et al.  Higher-order structure in regularity detection , 1993, Vision Research.

[33]  B Tversky,et al.  Force of symmetry in form perception. , 1984, The American journal of psychology.

[34]  J. Deręgowski Symmetry, Gestalt and Information Theory , 1971, The Quarterly journal of experimental psychology.

[35]  L D Williams,et al.  The source of feelings of familiarity: the discrepancy-attribution hypothesis. , 2000, Journal of experimental psychology. Learning, memory, and cognition.

[36]  John C. Baird,et al.  A quantitative approach to the study of visual symmetry , 1977 .

[37]  T. Poggio,et al.  The importance of symmetry and virtual views in three-dimensional object recognition , 1994, Current Biology.

[38]  L. Carmichael,et al.  An experimental study of the effect of language on the reproduction of visually perceived form. , 1932 .

[39]  M. Mendelson,et al.  The effects of symmetry and contour on recognition memory in children. , 1981, Journal of experimental child psychology.

[40]  L. Karlin,et al.  Memory for visual figures by the method of identical stimuli. , 1957, American Journal of Psychology.

[41]  Leonard Zusne,et al.  More on the Geometricity of Visual Form , 1962 .

[42]  Suparna Rajaram,et al.  Remembering and knowing: Two means of access to the personal past , 1993, Memory & cognition.

[43]  Johan Wagemans,et al.  Detection of symmetry in tachistoscopically presented dot patterns: Effects of multiple axes and skewing , 1991, Perception & psychophysics.

[44]  R. C. Casperson,et al.  The visual discrimination of geometric forms. , 1950, Journal of experimental psychology.

[45]  L. Postman,et al.  Psychology in the making : histories of selected research problems , 1962 .

[46]  Gestalts are more closely associated with performance on a discrimination task than are component stimuli. , 1990, The American journal of psychology.

[47]  Roger T. Davis Memory for Form , 1974 .

[48]  F. Karayanidis,et al.  An exploration of varieties of visual attention: ERP findings. , 1999, Brain research. Cognitive brain research.

[49]  E. Farran,et al.  Perceptual grouping and distance estimates in typical and atypical development: Comparing performance across perception, drawing and construction tasks , 2008, Brain and Cognition.

[50]  B. W. Whittlesea,et al.  The inferential basis of familiarity and recall: Evidence for a common underlying process , 2002 .

[51]  E. Howe,et al.  Immediate memory span for two-dimensional spatial arrays: effects of pattern symmetry and goodness. , 1986, Acta psychologica.

[52]  I. Paraskevopoulos Symmetry, recall, and preference in relation to chronological age. , 1968, Journal of Experimental Child Psychology.

[53]  J. Feldman Bias toward regular form in mental shape spaces. , 2000, Journal of experimental psychology. Human perception and performance.

[54]  J. Veroff,et al.  Changes in the memory-trace for perceived forms with successive reproductions. , 1956, American Journal of Psychology.

[55]  C. P. Duncan,et al.  A study of autonomous change in the memory trace by the method of recognition. , 1955, The American journal of psychology.

[56]  F. T. Perkins Symmetry in Visual Recall , 1932 .

[57]  R. Greene Recognition memory for pseudowords , 2004 .

[58]  M. M. Schnore,et al.  Immediate memory for visual patterns: Symmetry and amount of information , 1967 .

[59]  M. Wertheimer,et al.  Some determinants of phenomenal overlapping. , 1957, The American journal of psychology.

[60]  J. Fox,et al.  An Observation on Set and Visual Comparison Processes , 1977, The Quarterly journal of experimental psychology.

[61]  P. Locher,et al.  The influence of stimulus dimensionality and viewing orientation on detection of symmetry in dot patterns , 1992 .

[62]  N. G. Hanawalt,et al.  The effect of verbal suggestion in the recall period upon the reproduction of visually perceived forms , 1939 .

[63]  U. Neisser,et al.  Perceptual organization as a determinant of visual recognition memory. , 1974, The American journal of psychology.

[64]  A. Little,et al.  Attraction independent of detection suggests special mechanisms for symmetry preferences in human face perception , 2006, Proceedings of the Royal Society B: Biological Sciences.

[65]  Vani Pariyadath,et al.  Brief subjective durations contract with repetition. , 2008, Journal of vision.

[66]  D. Hebb,et al.  Errors of visual recognition and the nature of the trace. , 1945 .

[67]  S. Palmer,et al.  The role of symmetry in shape perception. , 1985, Acta psychologica.

[68]  Vicky G Bruce,et al.  Violations of Symmetry and Repetition in Visual Patterns , 1975 .

[69]  J. Gibson The reproduction of visually perceived forms , 1929 .

[70]  E. Goldmeier Progressive Changes in Memory Traces , 1941 .

[71]  Jon Driver,et al.  Parallel computation of symmetry but not repetition within single visual shapes , 1994 .

[72]  R. Greene Mirror effect in order and associative information: Role of response strategies. , 1996 .

[73]  E. Kemps,et al.  Complexity effects in visuo-spatial working memory: Implications for the role of long-term memory , 2001, Memory.

[74]  Jon Driver,et al.  Preserved figure-ground segregation and symmetry perception in visual neglect , 1992, Nature.

[75]  M. Brodeur,et al.  The Bank of Standardized Stimuli (BOSS), a New Set of 480 Normative Photos of Objects to Be Used as Visual Stimuli in Cognitive Research , 2010, PloS one.

[76]  N. G. Hanawalt,et al.  Memory trace for figures in recall and recognition , 1937 .

[77]  Christopher W Tyler,et al.  Face configuration processing in the human brain: the role of symmetry. , 2007, Cerebral cortex.

[78]  Rob van Lier,et al.  No symmetry advantage when object matching involves accidental viewpoints , 2006, Psychological research.

[79]  Wim Vanduffel,et al.  Symmetry activates extrastriate visual cortex in human and nonhuman primates. , 2005, Proceedings of the National Academy of Sciences of the United States of America.