Comparative psychology refers to the scientific study of the behavior and mental processes of non-human animals, especially as these relate to the phylogenetic history, adaptive significance, and development of behavior. Research in this area addresses many different issues, uses many different methods, and explores the behavior of many different species, from insects to primates.
Comparative psychology is sometimes assumed to emphasize cross-species comparisons, including those between humans and animals. However, some researchers feel that direct comparisons should not be the sole focus of comparative psychology and that intense focus on a single organism to understand its behavior is just as desirable; if not more so. Donald Dewsbury reviewed the works of several psychologists and their definitions and concluded that the object of comparative psychology is to establish principles of generality focusing on both proximate and ultimate causation.
Using a comparative approach to behavior allows one to evaluate the target behavior from four different, complementary perspectives, developed by Niko Tinbergen. First, one may ask how pervasive the behavior is across species (i.e. how common is the behavior between animal species?). Second, one may ask how the behavior contributes to the lifetime reproductive success of the individuals demonstrating the behavior (i.e. does the behavior result in animals producing more offspring than animals not displaying the behavior)? These two questions provide a theory for the ultimate cause of behavior.
Third, what mechanisms are involved in the behavior (i.e. what physiological, behavioral, and environmental components are necessary and sufficient for the generation of the behavior)? Fourth, a researcher may ask about the development of the behavior within an individual (i.e. what maturational, learning, social experiences must an individual undergo in order to demonstrate a behavior)? These latter two questions provide a theory for the proximate causes of behavior. For more details see Tinbergen's four questions.
The earliest works on "the social organization of ants" and "animal communication and psychology" were written by al-Jahiz, a 9th century Afro-Arab scholar who wrote many works on these subjects. The 11th century Arabic psychologist, Ibn al-Haytham (Alhazen), wrote the Treatise on the Influence of Melodies on the Souls of Animals, the early treatise dealing with the effects of music on animals. In the treatise, he demonstrates how a camel's pace could be hastened or retarded with the use of music, and shows other examples of how music can affect animal behavior, experimenting with horses, birds and reptiles. Through to the 19th century, a majority of scholars in the Western world continued to believe that music was a distinctly human phenomenon, but experiments since then have vindicated Ibn al-Haytham's view that music does indeed have an effect on animals.
Charles Darwin was central in the development of comparative psychology; it is thought that psychology should be spoken in terms of "pre-" and "post-Darwin" because his contributions were so influential. Darwin's theory led to several hypotheses, one being that the factors that set humans apart, such as higher mental, moral and spiritual faculties, could be accounted for by evolutionary principles. In response to the vehement opposition to Darwinism was the "anecdotal movement" led by George Romanes who set out to demonstrate that animals possessed a "rudimentary human mind." Romanes is most famous for two major flaws in his work: his focus on anecdotal observations and entrenched anthropomorphism.
Near the end of the 19th century, several scientists existed whose work was also very influential. Douglas Alexander Spalding was called the "first experimental biologist," and worked mostly with birds; studying instinct, imprinting, and visual and auditory development. Jacques Loeb emphasized the importance of objectively studying behavior, Sir John Lubbock is credited with first using mazes and puzzle devices to study learning and Lewis Henry Morgan is thought to be "the first ethologist in the sense in which we presently use the word."
Throughout the long history of comparative psychology, repeated attempts have been made to enforce a more disciplined approach, in which similar studies are carried out on animals of different species, and the results interpreted in terms of their different phylogenetic or ecological backgrounds. Behavioral ecology in the 1970s gave a more solid base of knowledge against which a true comparative psychology could develop. However, the broader use of the term "comparative psychology" is enshrined in the names of learned societies and academic journals, not to mention in the minds of psychologists of other specialisms, so the label of the field is never likely to disappear completely.
A persistent question with which comparative psychologists have been faced is the relative intelligence of different species of animal. Indeed, some early attempts at a genuinely comparative psychology involved evaluating how well animals of different species could learn different tasks. These attempts floundered; in retrospect it can be seen that they were not sufficiently sophisticated, either in their analysis of the demands of different tasks, or in their choice of species to compare. However, the definition of "intelligence" in comparative psychology is deeply affected by anthropomorphism, and focuses on simple tasks, complex problems, reversal learning, learning sets, and delayed alternation are plagued with practical and theoretical problems. In the literature, "intelligence" is defined as whatever is closest to human performance and neglects behaviors that humans are usually incapable of (e.g. echolocation). Specifically, comparative researchers encounter problems associated with individual differences, differences in motivation, differences in reinforcement, differences in sensory function, differences in motor capacities, and species-typical preparedness (i.e. some species have evolved to acquire some behaviors quicker than other behaviors).
Species studied 
A wide variety of species have been studied by comparative psychologists. However, a small number have dominated the scene. Ivan Pavlov's early work used dogs; although they have been the subject of occasional studies, since then they have not figured prominently. Increasing interest in the study of abnormal animal behavior has led to a return to the study of most kinds of domestic animal. Thorndike began his studies with cats, but American comparative psychologists quickly shifted to the more economical rat, which remained the almost invariable subject for the first half of the 20th century and continues to be used.
Skinner introduced the use of pigeons, and they continue to be important in some fields. There has always been interest in studying various species of primate; important contributions to social and developmental psychology were made by Harry F. Harlow's studies of maternal deprivation in rhesus monkeys. Cross-fostering studies have shown similarities between human infants and infant chimpanzees. Kellogg and Kellogg (1933)aimed to look at heredity and environmental effects of young primates. They found that a cross-fostered chimpanzee named Gua was better at recognizing human smells and clothing and that their infant (Donald) recognised humans better by their faces. The study ended 9 months after it had begun, because the infant began to imitate the noises of Gua.
Non human primates have also been used to show the development of language in comparison with human development. For example, Gardner (1967) successfully taught the female chimpanzee Washoe 350 words in American sign language. Washoe subsequently passed on some of this teaching to her adopted offspring Loulis. Other studies concluded that apes do not understand linguistic input but may form an intended meaning of what is being communicated.[full citation needed]
Interest in primate studies has increased with the rise in studies of animal cognition. Other animals thought to be intelligent have also been increasingly studied. Examples include various species of corvid, parrots—especially the African Gray Parrot— and dolphins. Alex (Avian Learning EXperiment) is a well known case study (1976-2007) which was developed by Pepperberg, who found that the African gray parrot Alex did not only mimic vocalisations but understood the concepts of same and different between objects. The study of non-human mammals has also included the study of dogs. Due to their domestic nature and personality humans have lived closely with dogs and parallels in communication and cognitive behaviours have therefore been recognised and further researched. Pilley and Reid found that a Border Collie named Chaser was able to successfully identify and retrieve 1022 distinct objects/toys.
Animal cognition 
Researchers who study animal cognition are interested in understanding the mental processes that control complex behavior, and much of their work parallels that of cognitive psychologists working with humans. For example, there is extensive research with animals on attention, categorization, concept formation, memory, spatial cognition, and time estimation. Much research in these and other areas is related directly or indirectly to behaviors important to survival in natural settings, such as navigation, tool use, and numerical competence. Thus, comparative psychology and animal cognition are heavily overlapping research categories.
Disorders of animal behavior 
Today an animal's psychological constitution is recognized by veterinary surgeons as an important part of its living conditions in domestication or captivity.
Common causes of disordered behavior in captive or pet animals are lack of stimulation, inappropriate stimulation, or overstimulation. These conditions can lead to disorders, unpredictable and unwanted behavior, and sometimes even physical symptoms and diseases. For example, rats that are exposed to loud music for a long period will ultimately develop unwanted behaviors that have been compared with human psychosis, like biting their owners.
The way dogs behave when understimulated is widely believed to depend on the breed as well as on the individual animal's character. For example, huskies have been known to completely ruin gardens and houses if they are not allowed enough activity. Dogs are also prone to psychological damage if they are subjected to violence. If they are treated very badly they may even become dangerous.
The systematic study of disordered animal behavior draws on research in comparative psychology, including the early work on conditioning and instrumental learning, but also on ethological studies of natural behavior. However, at least in the case of familiar domestic animals, it also draws on the accumulated experience of those who have worked closely with the animals.
Effect of animals on humans 
||It has been suggested that this article be merged with Anthropology. (Discuss) Proposed since March 2012.|
In anthropology, animal studies is regarded as a field that has been generally neglected even though animals have been used as a way to investigate the evolution of human behavior for many years. Topics such as domestication have been a key element in understanding the relationships between humans, for a sense of differentiation and inequality between humans and animals was cultivated as humans began to consider animals as property. The argument has been posited that this domestication development could then lead humans to believe inferior or different to themselves. Also, while some may be searching for how humans are like animals and how far they share some characteristics, anthropologists use this opportunity to see how different societies see their human nature depending on which animals they might be comparing themselves to, according to Ingold.
He goes on to question how other people phrase the problem of humanity and answers this by saying that an accepted premise is that in all societies children have to learn to differentiate and separate themselves from others. Strangers from Kin and "not people," like animals. Something that Ingold stated in his studies was that Sigmund Freud said, "Children show no trace of arrogance which urges adult civilized men to draw a hard-and-fast line between their own nature and that of all other animals. Children have no scruples over allowing animals to rank as their full equals." It's hard for people to accept that they themselves indeed are animals so they create these separations and divided into animals and wild animals and tame animals which are then divided into house pets, all of these things can be seen as analogies of man's contrast between someone who is part of a human community and someone who isn't: the outsider. Most times nature is symbolizing the outsider.
The New York Times had an article that showed the psychological benefits of animals, more specifically of children with their pets. It's been proven that having a pet does in fact improve kids' social skills, in the article Dr. Sue Doescher, a psychologist involved in the study, stated "It made the children more cooperative and sharing." It was also shown that these kids were more confident with themselves and able to be more empathic with other children.
Furthermore, in an edition of Social Science and Medicine it was stated that, "A random survey of 339 residents from Perth, Western Australia were selected from three suburbs and interviewed by telephone. Pet ownership was found to be positively associated with some forms of social contact and interaction, and with perceptions of neighborhood friendliness. After adjustment for demographic variables, pet owners scored higher on social capital and civic engagement scales." Results like these let us know that owning a pet provides opportunities for neighborly interaction, among many other chances for socialization among people.
Topics of study 
Notable comparative psychologists 
Noted comparative psychologists, in this broad sense, include:
Many of these were active in fields other than animal psychology; this is characteristic of comparative psychologists.
Related fields 
Fields of psychology and other disciplines that draw upon, or overlap with, comparative psychology include:
- Animal cognition
- Behavioral ecology
- Operant conditioning
- Experimental analysis of behavior
- Physiological psychology
- Dewsbury, D. (1978). Comparative Animal Behavior. McGraw-Hill Book Company. New York, NY.
- Papini, M.R. (2003). Comparative Psychology. In Handbook of Research Methods in Experimental Psychology. Ed. Stephen F. Davis. Blackwell. Malden, MA.
- Dewsbury, D. (1984). Comparative Psychology in the Twentieth Century. Hutchinson Ross Publishing Company. Stroudsburg, PA.
- Tinbergen, N. (1963). "On aims and methods of ethology". Zeitschrift fur Tierpsychologie 20: 410–33.
- (Haque 2004, p. 376)
- (Plott 2000, p. 461)
- Wynne, C. D. L. (1978). Animal Cognition: The Mental Lives of Animals. Palgrave. New York, NY.
- W.N. Kellogg and L.A. Kellogg (1933) The Ape and The Child: A Comparative Study of the Environmental Influence Upon Early Behavior, Hafner Publishing Co., New York and London.
- Terrace (1979)
- Savage-Rumbaugh (1987)
- Pepperberg, I. M. 1991 A communicative approach to animal cognition: a study of conceptual abilities of an Africa grey parrot.In: cognitive ethology; the minds of other animals (Ed.Carolyn A. Ristau), Lawrence Erlbaum Associates, Hillsdale New Jersey; Hove and London England.
- Pilley, J. W. & Reid, A. K. (2011). Border collie comprehends object names as verbal referents. Behavioural Processes, 86, 184-195.
- p. 2 , Menzel, R. & Fischer, J. (2010) ‘’Animal Thinking: Contemporary Issues in Comparative Cognition’’
- Wasserman & Zentall (eds) (2006) ‘’Comparative Cognition’’
- Sara J. Shettleworth (2010) ‘’Cogntion, Evolution, and Behavior (2nd Ed)’’ Oxford Univ. Press
- Mullin, Molly. "Animals and Anthropology." Society and Animals: Journal of Human-Animal Studies. 2002. Web. <http://www.societyandanimalsforum.org/sa/sa10.4/mullin.shtml>.
- What Is an Animal? Ed. Tim Ingold. Routledge, 1994. 14–15.
- Goleman, Daniel. "Health; Children and Their Pets: Unexpected Psychological Benefits." The New York Times. 1990. Web. <http://www.nytimes.com/1990/01/11/us/health-children-and-their-pets-unexpected-psychological-benefits.html?src=pm>.
- Wood, Lisa, Billie Giles-Corti, and Max Bulsara. "The Pet Connection: Pets as a Conduit for Social Capital?" Social Science and Medicine 61. 2005. 1159–73. Print.
- Haque, Amber (2004), "Psychology from Islamic Perspective: Contributions of Early Muslim Scholars and Challenges to Contemporary Muslim Psychologists", Journal of Religion and Health 43 (4): 357–77, doi:10.1007/s10943-004-4302-z
- Plott, C. (2000), Global History of Philosophy: The Period of Scholasticism, Motilal Banarsidass, ISBN 81-208-0551-8
The Donald Dewsbury book mentioned above, Comparative Psychology in the Twentieth Century is listed on abebooks.com
Further reading 
- Johnson-Pynn, J.; Fragaszy, D.M.; Cummins-Sebree, S. (2003). "Common territories in comparative and developmental psychology: The quest for shared means and meaning in behavioral investigations" (PDF). International Journal of Comparative Psychology 16: 1–27.
- Thorough list of active scientists interested in Comparative Cognition
- Theory of Comparative Psychology (Documents No. 8 and 9 in English)
- comparative psychology, an external wiki