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Abstract
In those moments when focus on creative work overrides input from the outside world, we are in a creative trance. This psychologically significant altered state of consciousness is inherent in everyone. It can take the form of daydreams generating scientific or creative ideas, hyperfocus in sports, visualizations that impact entire civilizations, life-changing audience experiences, or meditations for self-transformation that may access states beyond trance, becoming gateways to transcendence. Artist and psychologist Tobi Zausner shows how creative trance not only operates in scientific inventions and works of art in all media, but is also important in creating and recreating the self. Drawing on insights from cognitive neuroscience, clinical psychology and post-materialist psychology, this book investigates the diversity of the creative trance ranging from non-industrial societies to digital urban life, and its presence in people from all backgrounds and abilities. Finally, Zausner investigates the future of trance in our rapidly changing world.
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Over the past two decades, a new picture of the cognitive unconscious has emerged from a variety of disciplines that are broadly part of cognitive science. According to this picture, unconscious processes seem to be capable of doing many things that were thought to require intention, deliberation, and conscious awareness. Moreover, they accomplish these things without the conflict and drama of the psychoanalytic unconscious. These processes range from complex information processing, through goal pursuit and emotions, to cognitive control and self-regulation. This collection of 20 original chapters by leading researchers examines the cognitive unconscious from social, cognitive, and neuroscientific viewpoints, presenting some of the most important developments at the heart of this new picture of the unconscious. The volume, the first book in the new Social Cognition and Social Neuroscience series, will be an important resource on the cognitive unconscious for researchers in cognitive psychology and neuroscience.
The experience of willing an act arises from interpreting one's thought as the cause of the act. Conscious will is thus experienced as a function of the priority, consistency, and exclusivity of the thought about the action. The thought must occur before the action, be consistent with the action, and not be accompanied by other causes. An experiment illustrating the role of priority found that people can arrive at the mistaken belief that they have intentionally caused an action that in fact they were forced to perform when they are simply led to think about the action just before its occurrence.
Leonardo da Vinci finally did introspection of his work
and commented ‘I have offended God and mankind
because my work didn’t reach the quality it should have’.
This only shows that he was born far ahead of his time.
He is aptly regarded as the ‘hidden father of modern
anatomy’. Da Vinci created about 750 anatomical
drawings and planned an anatomical atlas of the stages
of man from the womb to the tomb, though that was
never completed
In this paper, we present a novel hypothesis as to what led humans in the Upper Paleolithic to penetrate and decorate deep, dark caves. Many of the depictions in these caves are located in halls or narrow passages deep in the interior, navigable only with artificial light. We simulated the effect of torches on oxygen concentrations in structures similar to Paleolithic decorated caves and showed that the oxygen quickly decreased to levels known to induce a state of hypoxia. Hypoxia increases the release of dopamine in the brain, resulting in hallucinations and out-of-body experiences. We discuss the significance of caves in indigenous world views and contend that entering these deep, dark environments was a conscious choice, motivated by an understanding of the transformative nature of an underground, oxygen-depleted space. The cave environment was conceived as both a liminal space and an ontological arena, allowing early humans to maintain their connectedness with the cosmos. It was not the decoration that rendered the caves significant; rather, the significance of the chosen caves was the reason for their decoration.
Dance has traditionally been viewed from a Eurocentric perspective as a mode of self-expression that involves the human body moving through space, performed for the purposes of art, and viewed by an audience. In this Hypothesis and Theory article, we synthesize findings from anthropology, sociology, psychology, dance pedagogy, and neuroscience to propose The Synchronicity Hypothesis of Dance, which states that humans dance to enhance both intra- and inter-brain synchrony. We outline a neurocentric definition of dance, which suggests that dance involves neurobehavioral processes in seven distinct areas including sensory, motor, cognitive, social, emotional, rhythmic, and creative. We explore The Synchronicity Hypothesis of Dance through several avenues. First, we examine evolutionary theories of dance, which suggest that dance drives interpersonal coordination. Second, we examine fundamental movement patterns, which emerge throughout development and are omnipresent across cultures of the world. Third, we examine how each of the seven neurobehaviors increases intra- and inter-brain synchrony. Fourth, we examine the neuroimaging literature on dance to identify the brain regions most involved in and affected by dance. The findings presented here support our hypothesis that we engage in dance for the purpose of intrinsic reward, which as a result of dance-induced increases in neural synchrony, leads to enhanced interpersonal coordination. This hypothesis suggests that dance may be helpful to repattern oscillatory activity, leading to clinical improvements in autism spectrum disorder and other disorders with oscillatory activity impairments. Finally, we offer suggestions for future directions and discuss the idea that our consciousness can be redefined not just as an individual process but as a shared experience that we can positively influence by dancing together.
Deafness leads to brain modifications that are generally associated with a cross-modal activity of the auditory cortex, particularly for visual stimulations. In the present study, we explore the cortical processing of biological motion that conveyed either non-communicative (pantomimes) or communicative (emblems) information, in early-deaf and hearing individuals, using fMRI analyses. Behaviorally, deaf individuals showed an advantage in detecting communicative gestures relative to hearing individuals. Deaf individuals also showed significantly greater activation in the superior temporal cortex (including the planum temporale and primary auditory cortex) than hearing individuals. The activation levels in this region were correlated with deaf individuals’ response times. This study provides neural and behavioral evidence that cross-modal plasticity leads to functional advantages in the processing of biological motion following lifelong auditory deprivation.
The role of emergence in the creation of consciousness has been debated for over a century, but it remains unresolved. In particular there is controversy over the claim that a “strong” or radical form of emergence is required to explain phenomenal consciousness. In this paper we use some ideas of complex system theory to trace the emergent features of life and then of complex brains through three progressive stages or levels: Level 1 (life), Level 2 (nervous systems), and Level 3 (special neurobiological features), each representing increasing biological and neurobiological complexity and ultimately leading to the emergence of phenomenal consciousness, all in physical systems. Along the way we show that consciousness fits the criteria of an emergent property—albeit one with extreme complexity. The formulation Life + Special neurobiological features → Phenomenal consciousness expresses these relationships. Then we consider the implications of our findings for some of the philosophical conundrums entailed by the apparent “explanatory gap” between the brain and phenomenal consciousness. We conclude that consciousness stems from the personal life of an organism with the addition of a complex nervous system that is ideally suited to maximize emergent neurobiological features and that it is an example of standard (“weak”) emergence without a scientific explanatory gap. An “experiential” or epistemic gap remains, although this is ontologically untroubling.
The association between neural oscillations and functional integration is widely recognized in the study of human cognition. Large-scale synchronization of neural activity has also been proposed as the neural basis of consciousness. Intriguingly, a growing number of studies in social cognitive neuroscience reveal that phase synchronization similarly appears across brains during meaningful social interaction. Moreover, this inter-brain synchronization has been associated with subjective reports of social connectedness, engagement, and cooperativeness, as well as experiences of social cohesion and ‘self-other merging’. These findings challenge the standard view of human consciousness as essentially first-person singular and private. We therefore revisit the recent controversy over the possibility of extended consciousness and argue that evidence of inter-brain synchronization in the fastest frequency bands overcomes the hitherto most convincing sceptical position. If this proposal is on the right track, our understanding of human consciousness would be profoundly transformed, and we propose a method to test this proposal experimentally.
Social interactions are a crucial part of human life. Understanding the neural underpinnings of social interactions is a challenging task that the hyperscanning method has been trying to tackle over the last two decades. Here, we review the existing literature and evaluate the current state of the hyperscanning method. We review the type of methods (fMRI, M/EEG, and fNIRS) that are used to measure brain activity from more than one participant simultaneously and weigh their pros and cons for hyperscanning. Further, we discuss different types of analyses that are used to estimate brain networks and synchronization. Lastly, we present results of hyperscanning studies in the context of different cognitive functions and their relations to social interactions. All in all, we aim to comprehensively present methods, analyses, and results from the last 20 years of hyperscanning research.
Although research supports the use of positively focused art-making activities in laboratory settings to improve mood, the literature is fraught with methodological issues and few investigators have developed a theoretical model to explain why it is psychologically beneficial. Through previous research, we developed a model outlining critical factors associated with well-being in the context of a personalized art-making task (P): it must be engaging (E), arousing (A), reduce rumination/self-focus (R), and increase life satisfaction (LS) or positive mood (PEARLS). We randomly assigned 216 participants to one of four art-making conditions, designed to either enhance negative or positive mood through a focus on rumination or growth. We found that a growth orientation during art making supported immediate mood repair, and, that this was not simply because of distraction. Planned comparisons confirmed the prediction that brief exposure to the quiet ego contemplation (QEC) intervention prior to growth-oriented art making was significantly more successful at enhancing positive mood than when no QEC was given and art making had a ruminative focus. Our findings suggest that clinicians should consider the benefits of priming activities, such as the QEC, before having clients engage in art-making activities to decrease self-focus. Our experimental study further supports our theoretical PEARLS model: in the context of personalized art-making activities, high flow, high arousal, and low rumination are essential for mood-repair to occur; positive mood may be facilitated by activities and mindsets that reduce self-focus and orient the individual toward growth and transcendence.
Purpose
Loneliness in older adulthood is a societal and public health challenge warranting identification of sustainable and community-based protective factors. This study investigated whether frequency of receptive arts engagement is associated with lower odds of loneliness in older adults.
Methods
We used data of respondents from waves 2 (2004–2005) and 7 (2014–2015) of the English Longitudinal Study of Ageing (ELSA) and examined cross-sectional (n = 6222) and longitudinal (n = 3127) associations between frequency of receptive arts engagement (including visits to the cinema, museums/galleries/exhibitions, theatre/concerts/opera) and odds of loneliness (cut-off ≥ 6 on three-item short form of the Revised UCLA Loneliness Scale). We fitted logistic regression models adjusted for a range of sociodemographic, economic, health and social, community and civic engagement factors.
Results
Cross-sectionally, we found dose–response negative associations between engagement with all receptive arts activities and odds of loneliness. Prospectively, in the fully-adjusted models we found most robust evidence for the negative association between engagement with museums/galleries/exhibitions and odds of loneliness (OR = 0.68, 95% CI 0.48–0.95) for those who engaged every few months or more often compared with those who never engaged. We found weaker evidence for lower odds of loneliness for more frequent engagement with theatre/concerts/opera.
Conclusions
Frequent engagement with certain receptive arts activities and venues, particularly museums, galleries and exhibitions, may be a protective factor against loneliness in older adults. Future research is needed to identify the mechanisms through which this process may occur, leading to better understanding of how arts activities and venues can reduce loneliness among older adults.
An integral part of human language is the capacity to extract meaning from spoken and written words, but the precise relationship between brain representations of information perceived by listening versus reading is unclear. Prior neuroimaging studies have shown that semantic information in spoken language is represented in multiple regions in the human cerebral cortex, while amodal semantic information appears to be represented in a few broad brain regions. However, previous studies were too insensitive to determine whether semantic representations were shared at a fine level of detail rather than merely at a coarse scale. We used fMRI to record brain activity in two separate experiments while participants listened to or read several hours of the same narrative stories, and then created voxelwise encoding models to characterize semantic selectivity in each voxel and in each individual participant. We find that semantic tuning during listening and reading are highly correlated in most semantically selective regions of cortex, and models estimated using one modality accurately predict voxel responses in the other modality. These results suggest that the representation of language semantics is independent of the sensory modality through which the semantic information is received.
SIGNIFICANCE STATEMENT Humans can comprehend the meaning of words from both spoken and written language. It is therefore important to understand the relationship between the brain representations of spoken or written text. Here, we show that although the representation of semantic information in the human brain is quite complex, the semantic representations evoked by listening versus reading are almost identical. These results suggest that the representation of language semantics is independent of the sensory modality through which the semantic information is received.
Past experiences have enormous power in shaping our daily perception. Currently, dynamical neural mechanisms underlying this process remain mysterious. Exploiting a dramatic visual phenomenon, where a single experience of viewing a clear image allows instant recognition of a related degraded image, we investigated this question using MEG and 7 Tesla fMRI in humans. We observed that following the acquisition of perceptual priors, different degraded images are represented much more distinctly in neural dynamics starting from ~500 ms after stimulus onset. Content-specific neural activity related to stimulus-feature processing dominated within 300 ms after stimulus onset, while content-specific neural activity related to recognition processing dominated from 500 ms onward. Model-driven MEG-fMRI data fusion revealed the spatiotemporal evolution of neural activities involved in stimulus, attentional, and recognition processing. Together, these findings shed light on how experience shapes perceptual processing across space and time in the brain.
Because the oxytocinergic (OT) system has previously been linked to regulation of complex social cognition and behavior, we examined whether intranasal administration of OT would modulate synchronization during a real-life dance paradigm. The current study examined pairs of friends while dancing after intranasal administration of OT or placebo. Motion tracking software and a computational model were utilized to measure synchrony between the partners as manifested in the velocity of their movements. In line with our predictions, OT increased synchrony between partners. This effect was stronger for individuals with higher trait empathy scores. We concluded that the OT system plays an important role in promoting interpersonal synchrony during dance, suggesting that OT underlies the kinesthetic dimension of empathy. Although the biological mechanisms underlying empathy have been studied extensively, scientifically validated knowledge about the kinesthetic dimension of empathy is still lacking. The current study supports the hypothesis that interpersonal synchronization in body movement could be a marker of kinesthetic empathy.
Adopting the framework of brain dynamics as a cornerstone of human consciousness, we determined whether dynamic signal coordination provides specific and generalizable patterns pertaining to conscious and unconscious states after brain damage. A dynamic pattern of coordinated and anticoordinated functional magnetic resonance imaging signals characterized healthy individuals and minimally conscious patients. The brains of unresponsive patients showed primarily a pattern of low interareal phase coherence mainly mediated by structural connectivity, and had smaller chances to transition between patterns. The complex pattern was further corroborated in patients with covert cognition, who could perform neuroimaging mental imagery tasks, validating this pattern’s implication in consciousness. Anesthesia increased the probability of the less complex pattern to equal levels, validating its implication in unconsciousness. Our results establish that consciousness rests on the brain’s ability to sustain rich brain dynamics and pave the way for determining specific and generalizable fingerprints of conscious and unconscious states.
Since the mid 1980's, mainstream social psychology investigations of self-complexity and psychopathology have produced contradictory results. These results are likely the result of a lack of theoretical and methodological grounding in complexity theory. The current study proposes that the self has an interconnected fractal structure, and that this structure may be reflected within inverse-power law (IPL) distributions of response times to self-related questions. MMPI-2 item response sets (N = 300) were selected from a larger pool of 1,881 forensic administrations. Self-complexity was operationalized as the inverse of the shape parameter (?) of the frequency distribution of reaction times to MMPI-2 items (n = 567) for each participant. It was predicted that: (a) these distributions would generally have strong fits with IPL distributions; and (b) that ? would tend to be correlated with pathology among the MMPI-2 scale scores. The results confirmed that the response-time distributions tended to fit IPLs (mean R2 = .94; range: .64 to .99). Furthermore, 18 of 45 correlations between ? and MMPI-2 scale scores associated with pathology were statistically significant, suggesting that rigidity in fractal self-structure is associated with broadband psychopathology. A follow up principal components analysis of the 45 individual scale scores across the participants confirmed this conclusion, producing three latent components, each of which was significantly correlated with ?, and each of which had a broad variety of scales with factor loadings > |.5|. These results may provide a first step toward a practical complexity-science approach to measuring the structural resilience of the self, and viewing the self as a complex self-organizing system.
Consciousness is at the very core of the human condition. Yet only in recent decades has it become a major focus in the brain and behavioral sciences. Scientists now know that consciousness involves many levels of brain functioning, from brainstem to cortex. The almost seventy articles in this book reflect the breadth and depth of this burgeoning field. The many topics covered include consciousness in vision and inner speech, immediate memory and attention, waking, dreaming, coma, the effects of brain damage, fringe consciousness, hypnosis, and dissociation.
Underlying all the selections are the questions, What difference does consciousness make? What are its properties? What role does it play in the nervous system? How do conscious brain functions differ from unconscious ones? The focus of the book is on scientific evidence and theory. The editors have also chosen introductory articles by leading scientists to allow a wide variety of new readers to gain insight into the field.
Bradford Books imprint
‘If religion generated everything that is essential in society, this is because the idea of society is the soul of religion.’
In The Elementary Forms of Religious Life (1912), Émile Durkheim set himself the task of discovering the enduring source of human social identity. He investigated what he considered to be the simplest form of documented religion - totemism among the Aborigines of Australia. Aboriginal religion was an avenue ‘to yield an understanding of the religious nature of man, by showing us an essential and permanent aspect of humanity’. The need and capacity of men and women to relate socially lies at the heart of Durkheim's exploration, in which religion embodies the beliefs that shape our moral universe.
The Elementary Forms has been applauded and debated by sociologists, anthropologists, ethnographers, philosophers, and theologians, and continues to speak to new generations about the origin and nature of religion and society. This new, lightly abridged edition provides an excellent introduction to Durkheim's ideas.
This chapter explains that there is a pervasive nonlinearity in the structure of universe; we see its consequences not only in the chaos of clouds and the movement of water, but it is also fundamental to our thinking, our behavior, our creativity, and it defines the nonlinear path of our self-evolution. Understanding these patterns of chaos offers us a profoundly new worldview, one that allows us to see accidents and mistakes as defining new trajectories to previously unrealized courses of action. The processes of self-organization and emergence are intrinsic to our insights and realizations and also serve to maintain our physical and emotional identity over time. Immersed in a world of nonlinear fractal patterns, we understand that they convey deeper meanings about the underlying structure of our psychological behavior. These repeating fractal patterns emerge in processes such as recognition, memory, creativity, and in the unconscious behavior of habits. Nonlinear models are not only clinically relevant to working with trauma and the elimination of self-destructive behavior, but they also illuminate the dynamics of self-transformation. Nonlinearity allows us to accept our imperfections and choose wholeness over perfection. Then imperfection, with all its surprises and room for creativity becomes, our own perfection and the perfection of our world.
The Prehistoric Cave at Azé (France) was divided in two parts by calcite flowstone. This isolated the innermost parts of the cave from the entrance, which remained connected to the surface. Since the closure, bats have not been able to access the cave beyond the flowstone blockage. They have been present only in the cave entrance. The byproducts released by bats had a considerable effect on this entrance part. Gaseous exhalations have changed the composition of the surrounding atmosphere, leading to the development of dome-shaped cupolas and other wall weathering features. Guano deposits built up causing the formation of aerosols and acidic leachates. The resulting corrosion of the limestone has led to the formation of phosphate deposits and biogenic karst. The rate of retreat of the cave walls has been estimated at 5 to 7 mm/ka. Corrosion has also affected archaeological artefacts, as well as any traces left on the walls by humans or animals. Bioglyphs linked to bears as well as anthropic graffiti have completely disappeared from the part of the cave used by bats.
We tested the role of hypnotic suggestibility, involuntariness, pain expectation, and subjective hypnotic depth in the prediction of placebo analgesia (PA) responsiveness. We also tested the link of lower and upper alpha sub-band (i.e., ‘alpha1ʹ and ‘alpha2ʹ) power changes with tonic PA responding during waking and hypnosis conditions. Following an initial PA manipulation condition, we recorded EEG activity during waking and hypnosis under two treatments: (1) painful stimulation (Pain); (2) painful stimulation after application of a PA cream. Alpha1 and alpha2 power were derived using the individual alpha frequency method. We found that (1) PA in both waking and hypnosis conditions significantly reduced relative pain perception; (2) during waking, all the above mentioned contextual measures were associated with pain reduction, while involuntariness alone was associated with pain reduction within hypnosis. Enhanced alpha2 power at the left-parietal lead was solely associated with pain reduction in waking, but not in hypnosis condition. Using multiple regression and mediation analyses we found that: (i) during waking, the enhancement of relative left-parietal alpha2 power, directly influenced the enhancement in pain reduction, and, indirectly, through the mediating positive effect of involuntariness; (j) during hypnosis, the enhancement of left-temporoparietal alpha2 power, through the mediation of involuntariness, influenced pain reduction. Current findings obtained during waking suggest that enhanced alpha2 power may serve as a direct-objective measure of the subjective reduction of tonic pain in response to PA treatment. Overall, our findings suggest that placebo analgesia during waking and hypnosis involves different processes of top-down regulation.
Similarity and analogy are fundamental in human cognition. They are crucial for recognition and classification, and have been associated with scientific discovery and creativity. Successful learning is generally less dependent on the memorization of isolated facts and abstract rules than it is on the ability to identify relevant bodies of knowledge already stored as the starting point for new learning. Similarity and analogy play an important role in this process - a role that in recent years has received much attention from cognitive scientists. Any adequate understanding of similarity and analogy requires the integration of theory and data from diverse domains. This interdisciplinary volume explores current developments in research and theory from psychological, computational, and educational perspectives, and considers their implications for learning and instruction. Well-known cognitive scientists examine the psychological processes involved in reasoning by similarity and analogy, the computational problems encountered in simulating analogical processing in problem solving, and the conditions promoting the application of analogical reasoning in everyday situations.
Exceptional experiences (ExE) incorporate a range of phenomena including subjective paranormal and transpersonal experiences. Synesthesia and synesthetic experiences are discussed as important variables in understanding the etiologies of ExE. The neural and psychological correlates of synesthetic experiences (associated with hyperconnectivity) are discussed in relation to ExE. It is argued that synesthetic processes enable both the detection and conscious perception of information from a range of sources that are usually unseen or inaccessible, including abstract, unlanguaged, preconscious, and potentially other nonlocal sources.
People born blind habitually experience linguistic utterances in the absence of visual cues. Neuroimaging evidence suggests that congenitally blind individuals also activate “visual” cortices during sentence comprehension. Do blind individuals show superior performance on sentence processing tasks? Congenitally blind (n = 25) and age and education matched sighted (n = 52) participants answered yes/no who-did-what-to-whom questions for auditorily presented sentences, some of which contained a grammatical complexity manipulation (long-distance movement dependency or garden path). Short-term memory was measured with a forward and backward letter-span task. A battery of control tasks included two speeded math tasks and vocabulary and reading tasks from Woodcock Johnson III. The blind group outperformed the sighted group on the sentence comprehension task, particularly for garden-path sentences, and on short-term memory span tasks, but performed similar to the sighted group on control tasks. Sentence comprehension performance was not correlated with working memory span performance, suggesting independent enhancements.
Numerous neuropsychological studies have investigated the effect of music on patients with Alzheimer’s disease. Findings suggest that music can improve behavioral symptoms, but its potential effects on cognitive abilities of patients still require more investigation.
In this 2 × 2 crossover study, we measured the impact of learning an individualized song on autobiographical memory recall and other cognitive abilities in 12 patients with mild to moderate Alzheimer’s disease. For each patient, one favorite song of the patient and one autobiographical memory with positive valence were associated to create a new personalized song. This song was taught to the patient by a speech and language therapy student throughout 10 sessions. This training period and a non-training period were proposed in a counterbalanced order between participants. We tested participants’ autobiographical recall and general cognitive abilities at three time points: at the start of the experiment, at crossover, and at the end of the experiment.
After excluding one outlier, results showed a significant improvement in the retrieval of the autobiographical memory and in general cognitive abilities after song training compared to the non-training period. Overall, our findings suggest that the use of personalized songs may be a useful and motivating tool for addressing the decline of autobiographical memory and of cognitive functions in general in persons with Alzheimer’s disease.
Early loss of vision is classically linked to large-scale cross-modal plasticity within occipital cortex. Much less is known about the effects of early blindness on auditory cortex. Here, we examine the effects of early blindness on the cortical representation of auditory frequency within human primary and secondary auditory areas using fMRI. We observe that 4 individuals with early blindness (2 females), and a group of 5 individuals with anophthalmia (1 female), a condition in which both eyes fail to develop, have lower response amplitudes and narrower voxelwise tuning bandwidths compared with a group of typically sighted individuals. These results provide some of the first evidence in human participants for compensatory plasticity within nondeprived sensory areas as a result of sensory loss.SIGNIFICANCE STATEMENT Early blindness has been linked to enhanced perception of the auditory world, including auditory localization and pitch perception. Here we used fMRI to compare neural responses with auditory stimuli within auditory cortex across sighted, early blind, and anophthalmic individuals, in whom both eyes fail to develop. We find more refined frequency tuning in blind subjects, providing some of the first evidence in human subjects for compensation within nondeprived primary sensory areas as a result of blindness early in life.
A biologically oriented introduction to synesthesia by the leading authority on the subject.
For decades, scientists who heard about synesthesia hearing colors, tasting words, seeing colored pain just shrugged their shoulders or rolled their eyes. Now, as irrefutable evidence mounts that some healthy brains really do this, we are forced to ask how this squares with some cherished conceptions of neuroscience. These include binding, modularity, functionalism, blindsight, and consciousness. The good news is that when old theoretical structures fall, new light may flood in. Far from a mere curiosity, synesthesia illuminates a wide swath of mental life.
In this classic text, Richard Cytowic quickly disposes of earlier criticisms that the phenomenon cannot be "real," demonstrating that it is indeed brain-based. Following a historical introduction, he lays out the phenomenology of synesthesia in detail and gives criteria for clinical diagnosis and an objective "test of genuineness." He reviews theories and experimental procedures to localize the plausible level of the neuraxis at which synesthesia operates. In a discussion of brain development and neural plasticity, he addresses the possible ubiquity of neonatal synesthesia, the construction of metaphor, and whether everyone is unconsciously synesthetic. In the closing chapters, Cytowic considers synesthetes' personalities, the apparent frequency of the trait among artists, and the subjective and illusory nature of what we take to be objective reality, particularly in the visual realm.
The second edition has been extensively revised, reflecting the recent flood of interest in synesthesia and new knowledge of human brain function and development. More than two-thirds of the material is new.
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