Good reasoning can lead to success; bad reasoning can lead to catastrophe. Yet, it's not obvious how we reason, and why we make mistakes - so much of our mental life goes on outside our awareness. In recent years huge strides have been made into developing a scientific understanding of reasoning. This book by one of the pioneers of the field, Philip Johnson-Laird, looks at the mental processes that underlie our reasoning. It provides the most accessible account yet of the science of reasoning.
We can all reason from our childhood onwards - but how? 'How We Reason' outlines a bold approach to understanding reasoning. According to this approach, we don't rely on the laws of logic or probability - we reason by thinking about what's possible, we reason by seeing what is common to the possibilities. As the book shows, this approach can answer many of the questions about how we reason, and what causes mistakes in our reasoning that can lead to disasters such as Chernobyl. It shows why our irrational fears may become psychological illnesses, why terrorists develop 'crazy' ideologies, and how we can act in order to improve our reasoning. The book ends by looking at the role of reasoning in three extraordinary case histories: the Wright brothers' use of analogies in inventing their flyer, the cryptanalysts' deductions in breaking the German's Enigma code in World War II, and Dr. John Snow's inductive reasoning in discovering how cholera spread from one person to another.
Accessible, stimulating, and controversial, How we Reason presents a bold new approach to understanding one of the most intriguing facets of being human.

The nature of attention is one of the oldest and most central problems in psychology. A huge amount of research has been produced on this subject in the last half century, especially on attention in the visual modality, but a general explanation has remained elusive. Many still view attention research as a field that is fundamentally fragmented. This book takes a different perspective and presents a unified theory of visual attention: the TVA model. The TVA model explains the many aspects of visual attention by just two mechanisms for selection of information: filtering and pigeonholing. These mechanisms are described in a set of simple equations, which allow TVA to mathematically model a large number of classical results in the attention literature. The theory explains psychological and neuroscientific findings by the same equations; TVA is a complete theory of visual attention, linking mind and brain. Aimed at advanced students and professional researchers, Principles of Visual Attention contains a detailed review of the most important research done on attention in vision, spanning cognitive psychology, brain imaging, patient studies, and recordings from single cells in the visual cortex. The book explains the TVA model and shows how it accounts for attentional effects observed across all the research areas described. Principles of Visual Attention offers a uniquely integrated view on a central topic in cognitive neuroscience.

For many years the Handbook of Methods in Nonverbal Behavior Research (Scherer & Ekman, 1982) has been an invaluable text for researchers looking for methods to study nonverbal behavior and the expression of affect. A successor to this essential text, The New Handbook of Methods in Nonverbal Behavior Research includes chapters on coding and methodological issues for a variety of areas in nonverbal behavior: facial actions, vocal behavior, and body movement. Issues relevant to judgment studies, methodology, reliability, analyses, etc. have also been updated. The topics are broad and include specific information about methodology and coding strategies in education, psychotherapy, deception, nonverbal sensitivity, and marital and group behavior. There is also a chapter detailing specific information on the technical aspects of recording the voice and face, and specifically in relation to deception studies.
This volume will be valuable for both new researchers and those already working in the fields of nonverbal behavior, affect expression, and related topics. It will play a central role in further refining research methods and coding strategies, allowing a comparison of results from various laboratories where research on nonverbal behavior is being conducted. This will advance research in the field and help to coordinate results so that a more comprehensive understanding of affect expression can be developed.

Memory, attention, and decision-making are three major areas of psychology. They are frequently studied in isolation, and using a range of models to understand them. This book brings a unified approach to understanding these three processes. It shows how these fundamental functions for cognitive neuroscience can be understood in a common and unifying computational neuroscience framework. This framework links empirical research on brain function from neurophysiology, functional neuroimaging, and the effects of brain damage, to a description of how neural networks in the brain implement these functions using a set of common principles. The book describes the principles of operation of these networks, and how they could implement such important functions as memory, attention, and decision-making. The topics covered include The hippocampus and memory Reward and punishment related learning: emotion and motivation Visual object recognition learning Short term memory Attention, short term memory, and biased competition Probabilistic decision-making Action selection Decision-making Also included are tutorial appendices on Neural networks in the brain Neural encoding in the brain 'Memory, Attention and Decision-Making' will be valuable for those in the fields of neuroscience, psychology, and cognitive neuroscience from advanced undergraduate level upwards. It will also be of interest to those interested in neuroeconomics, animal behaviour, zoology, evolutionary biology, psychiatry, medicine, and philosophy. The book has been written with modular chapters and sections, making it possible to select particular Chapters for course work.

Speaking is one of the most complex skills that humans perform. In our everyday communication, we transfer sentences, concepts, thoughts, and ideas. How though, is the speaker able to convert these into movements of the speech apparatus? These speech movements are the observable end-product, but what neurological, psycholinguistic, and perceptual-motor processes lie behind their production? To fully understand speech disorders, such as stuttering, apraxia of speech, and Parkinsonian dysarthria, the disruptions in this complex interplay are highly relevant. Equally important is the question of how the infant develops from random babbling to precisely controlled production of words, syllables, and phonemes. This volume presents state of the art research in the science of speech motor control and speech disorders. All the chapters take a fundamental, model-oriented perspective, as introduced in the first section of the volume. Further topics covered in this book are: brain imaging studies and the rapid progression in comprehending neural mechanisms; developmental studies revealing perceptual-motor continuities and discontinuities; psycholinguistic experimentation showing higher-order influences on speech motor control; and recent notions and applications to the understanding of speech disorders.

'Working Memory, Thought, and Action' is the magnum opus of one of the most influential cognitive psychologists of the past 50 years. This new volume on the model he created (with Graham Hitch) discusses the developments that have occurred within the model in the past twenty years, and places it within a broader context. Working memory is a temporary storage system that underpins our capacity for coherent thought. Some 30 years ago, Baddeley and Hitch proposed a way of thinking about working memory that has proved to be both valuable and influential in its application to practical problems. This book updates the theory, discussing both the evidence in its favour, and alternative approaches. In addition, it discusses the implications of the model for understanding social and emotional behaviour, concluding with an attempt to place working memory in a broader biological and philosophical context. Inside are chapters on the phonological loop, the visuo-spatial sketchpad, the central executive and the episodic buffer. There are also chapters on the relevance to working memory of studies of the recency effect, of work based on individual differences, and of neuroimaging research. The broader implications of the concept of working memory are discussed in the chapters on social psychology, anxiety, depression, consciousness and on the control of action. Finally, Baddeley discusses the relevance of a concept of working memory to the classic problems of consciousness and free will. This new volume from one of the pioneers in memory research will doubtless emulate the success of its predecessor, and be a major publication within the psychological literature.

Eye movements are a vital part of our interaction with the world. They play a pivotal role in perception, cognition, and education. Research in this field is now proceeding at a considerable pace and casting new light on how the eyes move and what information we can derive during the frequent and brief periods of fixation. However, the origins of this work are less well known, even though much of our knowledge was derived from this research with far more primitive equipment. This book is unique in tracing the history of eye movement research. It shows how great strides were made in this area before modern recording devices were available, especially in the measurement of nystagmus. When photographic techniques were adapted to measure discontinuous eye movements, from about 1900, many of the issues that are now basic to modern research were then investigated. One of the earliest cognitive tasks examined was reading, and it remains in the vanguard of contemporary research. Modern researchers in this field will be astonished at the subtleties of these early experimental studies and the ingenuity of interpretations that were advanced one and even two centuries ago. Though physicians often carried out the original eye movement research, later on it was pursued by psychologists - it is within contemporary neuroscience that we find these two strands reunited. Anyone interested in the origins of psychology and neuroscience will find much to stimulate and surprise them in this valuable new work.

Humans, like other primates, are intensely social creatures. One of the major functions of our brains must be to enable us to be as skilful in social interactions as we are in our interactions with the physical world (e.g. recognising objects and grasping them). Furthermore, any differences between human brains and those of our nearest relatives, the great apes, are likely to be linked to our unique achievements in social interaction and communication rather than our motor or perceptual skills. Unique to humans is the ability to mentalise (or mind read), that is to perceive and communicate mental states, such as beliefs and desires. A key problem facing science is to uncover the biological mechanisms underlying our ability to read other minds and to show how these mechanisms evolved. To solve this problem we need to do experiments in which people (or animals) interact with one another rather than behaving in isolation. Such experiments are now being conducted in increasing numbers and many of the leading exponents of such experiments have contributed to this volume. 'The Neuroscience of Social Interactions' will be an important step in uncovering the biological mechanisms underlying social interactions - undoubtedly one of the major programmes for neuroscience in the 21st century.

Die Betrachtung der Interaktionen emotionaler und kognitiver Prozesse ist von zentraler Bedeutung fur das Verstandnis der menschlichen Entwicklung und des menschlichen Verhaltens sowie fur das Verstandnis unterschiedlicher psychiatrischer Erkrankungen. In der vorliegenden Monographie werden zunachst grundlegende Erkenntnisse zur Emotions/Kognitions-Kopplung bei Gedachtnisprozessen und deren Relevanz fur affektive Stoerungen dargestellt. Nach einer Einfuhrung in die Methodik der ereigniskorrelierten Hirnpotentiale werden die Moeglichkeiten der Anwendung dieses Verfahrens fur Fragestellungen im Bereich der Emotions/Kognitions-Kopplung bei Patienten mit affektiven Erkrankungen und bei gesunden Probanden untersucht und facherubergreifend (Psychiatrie, Psychologie, Neurobiologie und Elektrophysiologie) diskutiert.

Herbst-/Winterdepressionen werden bereits seit der Antike beschrieben, und ebenso lang ist der Einfluss des Lichtes auf die seelische Gesundheit bekannt. Neuere systematische Untersuchungen der Herbst-/Winterdepression und der Lichttherapie haben jedoch erst seit etwa 20 Jahren Eingang in die Medizin und in psychiatrische Therapieformen gefunden. Es zeigte sich, dass die Lichttherapie bei den Herbst-/Winterdepressionen und deren subsyndromaler Form als Therapie der ersten Wahl eingesetzt werden kann, und dass die biologischen Veranderungen bei den Herbst-/Winterdepressionen ahnlich wie bei den nicht-saisonal gebundenen Depressionen vorhanden sind, eventuell in einer milderen Auspragung. In diesem Handbuch werden sowohl die Diagnostik der Herbst-/Winterdepression als auch die Praxis der Lichttherapie vom theoretischen und vor allem praktischen Gesichtspunkt international bekannter Forscher, vorwiegend aus dem deutschsprachigen Raum, bearbeitet."

Our sense that a waltz is "in three" or a blues song is "in four with a shuffle" comes from our sense of musical meter. Hearing in Time explores the metric aspect of our musical experience from a psychological point of view. Musical meter is taken as a musically-specific instance entrainment, that is, our more general ability to synchronize our actions to the rhythms around us. As such, musical meter is subject to a number of fundamental perceptual and cognitive constraints. These constraints are the cornerstones of Hearing in Time's account of musical meter. Hearing in Time also takes into account the fact that listening to music, like many other rhythmic activities, is something that we do a lot. It also approaches musical meter in the context of music as it is actually performed, with nuances of timing and dynamics, rather than as a theoretical ideal. Hearing in Time's approach to meter is not based on any particular musical style or cultural practice, and so it discusses musical examples from a wide range of musical styles and cultures-from Beethoven and Bach to Brubeck and Ghanaian (Ewe) drumming. In taking this broad approach a number of fundamental similarities between a variety of different metric phenomena-such as the difference between so-called simple versus complex or additive meters-become apparent. Hearing in Time is written for musicians, musicologists, music theorists and psychologists who are interested in rhythm and meter. Only a modest ability read a musical score is presumed, and most musical examples are taken from familiar popular and classical repertory.

This book aims to impart an understanding of the changes in perception associated with cochlear hearing loss, of the difficulties faced by the hearing-impaired person and of the limitations of current hearing aids. Physiological data and perceptual data are inter-related and the book aims to present both data and concepts in an integrated way so that the reader comes away with an impression not only of what happens, but also why it happens.

Die Entstehungsbedingungen der Schizophrenie, einer meist chronisch verlaufenden psychobiologischen Erkrankung, unter der mindestens 1% der Weltbevoelkerung leidet, sind trotz intensiver Forschungen nach wie vor unbekannt. Die vorliegende Monographie legt ein Erklarungsmodell der Schizophrenie vor, wobei sich die molekulare Hypothese auf die Stoerung der Hirnfunktionen ubertragen lasst und davon die schizophrenen Symptome sowie das Wirklichkeitserleben dieser Patienten abgeleitet werden kann. Ferner kann die Theorie des Verlustes der Selbstgrenzen zumindest auf der molekularen Ebene experimentell uberpruft werden. Zum besseren Verstandnis des schizophrenen Wirklichkeitserlebens wird der Verlust der Selbstgrenzen auch durch psychologische, physiktheoretische, philosophische, kommunikationstheoretische und psychologische Konzepte erklart. Besonders beeindruckend sind die Fallbeispiele. Da die Theorie experimentell uberprufbar ist, ist ein voellig neuer Ansatz der Behandlung der Schizophrenie moeglich.

Zeichnen und Malen sind spezifisch menschliche Hirnleistungen und waren ursprunglich keine elitare Freizeitgestaltung, sondern ein lustbegleitetes Lernprogramm in der Auseinandersetzung mit der Umwelt. Sie sind in der Kindheit Vorbote und Begleiter der Sprachentwicklung. Bildliches Gestalten verbindet viele Einzelfunktionen unseres Nervensystems zu einem Aktionskanon und aktiviert Einzelfunktionen, die bei Gehirnerkrankungen beeintrachtigt wurden oder sichtbarer Ausdruck solcher Storungen sind. Damit konnen Zeichnen und Malen wertvolle Elemente der neurologischen Diagnostik und Rehabilitation sein. Dieses Buch enthalt keine Definition von Kunst, noch werden die beispielhaften Arbeiten neurologischer Patienten als Kunst gesehen, sondern der Autor zeigt die zerebralen Mechanismen, die in ihrem Zusammenwirken zu dieser menschenspezifischen Leistung fuhren und demonstriert an ausgewahlten Beispielen die Auswirkung von organischen Hirnerkrankungen auf das "Funktionsorchester" bildnerischen Gestaltens."

Die klassische Neuroanatomie scheiterte am Versuch, eine Erklarungsbasis fur die Gesetzmassigkeiten von Kognition, Verhalten, Erinnerung und Emotion zu schaffen. Eine Cartesianische Geist-Korper-Kluft verlauft daher mitten durch die Neurologie und Psychiatrie, die erst jetzt mit neuen neurobiologischen Einsichten eingeebnet wird. Der Autor entwickelt ein anatomisch und neurophysiologisch orientiertes Verstandnis fur Gefuhle, fur die Sexualitat, fur die trugerische Gewissheit von Erinnerung und die Scheinkompetenz der Sprache, aber auch fur die Erstarrungstendenzen unseres rationalen Planens und Verhaltens. Aus dieser Perspektive auf das Leben in Gesundheit und Krankheit zu blicken bedeutet, das eigene Gehirn und seine Funktionen naher kennen zu lernen und dabei zu bemerken, dass dieses Gehirn virtuelle Grenzen einen gitterlosen Kafig um unseren Lebensraum, um unsere Realitat aufstellt, die so echt wirken, dass man nicht auf die Idee kame, sie in eine neue Freiheit zu uberschreiten."

Music offers a unique opportunity to better understand the organization of the human brain. Like language, music exists in all human societies. Like language, music is a complex, rule-governed activity that seems specific to humans, and associated with a specific brain architecture. Yet unlike most other high-level functions of the human brain - and unlike language - music is a skill at which only a minority of people become proficient. The study of music as a major brain function has for some time been relatively neglected. Just recently, however, we have witnessed an explosion in research activities on music perception and performance and their correlates in the human brain. This volume brings together an outstanding collection of international authorities - from the fields of music, neuroscience, psychology, and neurology - to describe the amazing advances being made in understanding the complex relationship between music and the brain. Aimed at psychologists and neuroscientists, this is a book that will lay the foundations for a cognitive neuroscience of music.

Sacred Knowledge is the first well-documented, sophisticated account of the effect of psychedelics on biological processes, human consciousness, and revelatory religious experiences. Based on nearly three decades of legal research with volunteers, William A. Richards argues that, if used responsibly and legally, psychedelics have the potential to assuage suffering and constructively affect the quality of human life. Richards's analysis contributes to social and political debates over the responsible integration of psychedelic substances into modern society. His book serves as an invaluable resource for readers who, whether spontaneously or with the facilitation of psychedelics, have encountered meaningful, inspiring, or even disturbing states of consciousness and seek clarity about their experiences. Testing the limits of language and conceptual frameworks, Richards makes the most of experiential phenomena that stretch our conception of reality, advancing new frontiers in the study of belief, spiritual awakening, psychiatric treatment, and social well-being. His findings enrich humanities and scientific scholarship, expanding work in philosophy, anthropology, theology, and religious studies and bringing depth to research in mental health, psychotherapy, and psychopharmacology.

1 Erkenntnisinteresse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1. 1 Warum Konstruktivismus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1. 1. 1 Ein emanzipatorisches Paradigma . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1. 1. 2 Konstruktivismus und Ethik . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1. 1. 3 Konstruktivistische Imperative fUr das wissenschaftliche Vorgehen . . . . 8 1. 1. 4 Sozialer Konstruktivismus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 1. 2 Warum Wahmehmungspsychologie? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 1. 3 Warum Geschmackswahmehmung? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 1. 3. 1 Zum Prinzip der undifferenzierten Codierung . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 1. 3. 2 Kultur & Geschmack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 1. 3. 3 Ein wichtiger Unterschied zwischen Schmecken und Sehen . . . . . . . . 18 1. 4 Warum Vegetarier? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 1. 4. 1 Vegetarier als EBkulturwechsler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 1. 4. 2 Uber-Vegetarier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 2 Geschmackswahmehmung . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ' . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 2. 1 Anfange der Geschmacksforschung . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 2. 2 Biologische und genetische Ansiitze . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 2. 2. 1 Belege gegen die traditionellen Ansiitze ' . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 2. 3 Industrielle Geschmacksforschung . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 2. 4 Geschmack, Geruch, Optik und all die anderen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 2. 5 Die Sprache der Geschmackswahmehmung . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 2. 6 EinfluB der Kultur und Kulturvergleiche . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 3 Konstruktivismus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 3. 1 Entfemte Verwandte: Die Strukturalisten . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 3. 2 Die Binnenpsyche: Radikaler Konstruktivismus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 3. 2. 1 Perspektivenwechsel: Von'den Sinnesorganen zum Gehim . . . . . . . . . . . . . . . . . 44 3. 2. 2 Fragen an den Radikalen Konstruktivismus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 3. 2. 3 Konstruktivismus und Gestaltpsychologie . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 3. 2. 4 Autopoiese und Selbstreferentialitat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 3. 3 Ein sozial-konstruktivistischer Ansatz . . ., . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 3. 3. 1 Yom DenkkolleKtiv und den Geschmacksgestalten . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 3. 3. 2 Unsere Sprache bestimmt unsere Welt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 3. 3. 3 Das ''Y''-Modell der Wahmehmung . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 4 Ableitung der Fragestellungen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 4. 1 Die Divergenz - Hypothese . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Kantowitz, Roediger, and Elmes, all prominent researchers, take an example-based approach to the fundamentals of research methodology. The book is organized by topic--such as research in human factors, learning, thinking, and problem solving--and the authors discuss and clarify research methods in the context of actual research conducted in these specific areas. This unique feature helps readers connect the concepts of sound methodology with their practical applications. Carefully selected real-world examples allow readers to see for themselves the issues and problems that can occur in conducting research. More importantly, readers develop a sense of how to anticipate and adjust for problems in their own research.

Darwin's work of 1872 still provides the point of departure for research in the theory of emotion and expression. Although he lacked the modern research tool of cybernetics, his basic methods have not been improved upon: the study of infants, of the insane, of paintings and sculpture, of some of the commoner animals; the use of photographs of expression submitted to different judges; and the comparative study of expression among different peoples. This new edition will be warmly welcomed by those behavioral scientists who have recently shown an intense interest in the scientific study of expression. Lay readers, too, will be struck by the freshness and directness of this book, which includes, among other data, Darwin's delightfully objective analysis of his own baby's smiles and pouts.