Accessing the meaning of invisible words

Previous research has shown implicit semantic processing of faces or pictures, but whether symbolic carriers such as words can be processed this way remains controversial. Here we examine this issue by adopting the continuous flash suppression paradigm to ensure that the processing undergone is indeed unconscious without the involvement of partial awareness. Negative or neutral words projected into one eye were made invisible due to strong suppression induced by dynamic-noise patterns shown in the other eye through binocular rivalry. Inverted and scrambled words were used as controls to provide baselines at orthographic and feature levels, respectively. Compared to neutral words, emotion-described and emotion-induced negative words required longer time to release from suppression, but only for upright words. These results suggest that words can be processed unconsciously up to semantic level since under interocular suppression completely invisible words can lead to different processing speed due to the emotion information they carry.

[1]  S Lehéricy,et al.  The visual word form area: spatial and temporal characterization of an initial stage of reading in normal subjects and posterior split-brain patients. , 2000, Brain : a journal of neurology.

[2]  Sheng He,et al.  Seeing the invisible: The scope and limits of unconscious processing in binocular rivalry , 2008 .

[3]  J. Stroop.  Studies of interference in serial verbal reactions. , 1992 .

[4]  R. Blake,et al.  Binocular rivalry and semantic processing: out of sight, out of mind. , 1983, Journal of experimental psychology. Human perception and performance.

[5]  Karine Sergerie,et al.  The role of the amygdala in emotional processing: A quantitative meta-analysis of functional neuroimaging studies , 2008, Neuroscience & Biobehavioral Reviews.

[6]  W. Stroebe,et al.  Beyond Vicary's fantasies: The impact of subliminal priming and brand choice , 2006 .

[7]  Emmanuel Dupoux,et al.  How “semantic” is response priming restricted to practiced items? A reply to Abrams & Grinspan (2007) , 2007, Consciousness and Cognition.

[8]  A. Marcel.  Conscious and unconscious perception: Experiments on visual masking and word recognition , 1983, Cognitive Psychology.

[9]  A. David,et al.  Predictors of amygdala activation during the processing of emotional stimuli: A meta-analysis of 385 PET and fMRI studies , 2008, Brain Research Reviews.

[10]  [Amygdala recording of emotions evoked by subliminal words]. , 2005, Medecine sciences : M/S.

[11]  D. Chalmers.  Consciousness and Cognition , 1990 .

[12]  R. Blake,et al.  Grouping visual features during binocular rivalry , 1999, Vision Research.

[13]  S. Dehaene,et al.  Unconscious semantic priming extends to novel unseen stimuli , 2001, Cognition.

[14]  Richard L. Abrams,et al.  Unconscious semantic priming in the absence of partial awareness , 2007, Consciousness and Cognition.

[15]  Sheng He,et al.  Cortical Responses to Invisible Faces: Dissociating Subsystems for Facial-Information Processing , 2006, Current Biology.

[16]  R. Blake,et al.  Interocular suppression differentially affects achromatic and chromatic mechanisms , 2009, Attention, perception & psychophysics.

[17]  Yan Yan,et al.  An ERP study of the neural correlates of processing Chinese content words and function words , 2008, Journal of Neurolinguistics.

[18]  Joseph E LeDoux.  Emotion Circuits in the Brain , 2000 .

[19]  R. Dolan,et al.  Effects of Attention and Emotion on Face Processing in the Human Brain An Event-Related fMRI Study , 2001, Neuron.

[20]  P. Walker.  Binocular rivalry : Central or peripheral selective processes? , 1978 .

[21]  R. Blake,et al.  Fearful expressions gain preferential access to awareness during continuous flash suppression. , 2007, Emotion.

[22]  Ted Rule,et al.  Chinese Language , 2009 .

[23]  Fang Fang,et al.  A gender- and sexual orientation-dependent spatial attentional effect of invisible images , 2006, Proceedings of the National Academy of Sciences.

[24]  Joseph E LeDoux.  Emotion circuits in the brain. , 2009, Annual review of neuroscience.

[25]  O. John,et al.  Automatic vigilance: the attention-grabbing power of negative social information. , 1991, Journal of personality and social psychology.

[26]  Joseph E LeDoux,et al.  Contributions of the Amygdala to Emotion Processing: From Animal Models to Human Behavior , 2005, Neuron.

[27]  D. Alais,et al.  Contour interactions between pairs of Gabors engaged in binocular rivalry reveal a map of the association field , 2006, Vision Research.

[28]  D. Algom,et al.  A rational look at the emotional stroop phenomenon: a generic slowdown, not a stroop effect. , 2004, Journal of experimental psychology. General.

[29]  Marvin M. Chun,et al.  Attentional rubbernecking: Cognitive control and personality in emotion-induced blindness , 2005, Psychonomic bulletin & review.

[30]  Richard L. Abrams,et al.  Semantic and subword elements of unconscious priming: Commentary on Kouider and Dupoux (2007) , 2007, Consciousness and Cognition.

[31]  Allan Collins,et al.  A spreading-activation theory of semantic processing , 1975 .

[32]  Richard L. Abrams,et al.  Parts Outweigh the Whole (Word) in Unconscious Analysis of Meaning , 2000, Psychological science.

[33]  Emmanuel Dupoux,et al.  Partial Awareness Creates the “Illusion” of Subliminal Semantic Priming , 2004, Psychological science.

[34]  Timothy P. McNamara,et al.  Theories of priming: I. Associative distance and lag. , 1992 .

[35]  Naotsugu Tsuchiya,et al.  Intact rapid detection of fearful faces in the absence of the amygdala , 2009, Nature Neuroscience.

[36]  N. Logothetis,et al.  Visual competition , 2002, Nature Reviews Neuroscience.

[37]  Alan W Freeman,et al.  Multistage model for binocular rivalry. , 2005, Journal of neurophysiology.

[38]  T. Takeuchi,et al.  The role of learning experience on the perceptual organization of Chinese characters , 2003 .

[39]  N. Logothetis,et al.  Grouping and segmentation in binocular rivalry , 2001, Vision Research.

[40]  René Zeelenberg,et al.  The Impact of Emotion on Perception , 2006, Psychological science.

[41]  S. Dehaene,et al.  Levels of processing during non-conscious perception: a critical review of visual masking , 2007, Philosophical Transactions of the Royal Society B: Biological Sciences.

[42]  R H Phaf,et al.  Asymmetric affective evaluation of words and faces. , 1997, British journal of psychology.

[43]  Sheng He,et al.  Processing of Invisible Stimuli: Advantage of Upright Faces and Recognizable Words in Overcoming Interocular Suppression , 2007, Psychological science.

[44]  Alan Baddeley,et al.  Attentional capture by emotional stimuli is modulated by semantic processing. , 2008, Journal of experimental psychology. Human perception and performance.

[45]  A. Anderson,et al.  Lesions of the human amygdala impair enhanced perception of emotionally salient events , 2001, Nature.

[46]  David A. Balota,et al.  Not All Negative Words Slow Down Lexical Decision and Naming Speed: Importance of Word Arousal , 2008 .

[47]  S. Dehaene,et al.  Nonconscious semantic processing of emotional words modulates conscious access. , 2006, Proceedings of the National Academy of Sciences of the United States of America.

[48]  Richard L. Abrams.  Unconscious processing of multiple nonadjacent letters in visually masked words , 2005, Consciousness and Cognition.

[49]  Bhavin R. Sheth,et al.  How emotional arousal and valence influence access to awareness , 2008, Vision Research.

[50]  F. Fang,et al.  Cortical responses to invisible objects in the human dorsal and ventral pathways , 2005, Nature Neuroscience.

[51]  Sheng He,et al.  Semantic and subword priming during binocular suppression , 2009, Consciousness and Cognition.

[52]  Adriana de Pesters,et al.  Psychophysical magic: rendering the "invisible" visible , 2009 .

[53]  Su-Ling Yeh,et al.  Dissociation of processing time and awareness by the inattentional blindness paradigm , 2008, Consciousness and Cognition.

[54]  S. Hochstein,et al.  View from the Top Hierarchies and Reverse Hierarchies in the Visual System , 2002, Neuron.

[55]  R. Hess,et al.  Importance of phase alignment for interocular suppression , 2009, Vision Research.

[56]  Zachary Estes,et al.  Automatic vigilance for negative words is categorical and general , 2008 .

[57]  C. Koch,et al.  Continuous flash suppression reduces negative afterimages , 2005, Nature Neuroscience.