Kristine Coleman - Academia.edu (original) (raw)

Papers by Kristine Coleman

Research paper thumbnail of Reply from D.S. Wilson et al

Trends in Ecology & Evolution, 1995

Research paper thumbnail of Shyness and boldness in humans and other animals

Trends in Ecology & Evolution, 1994

Research paper thumbnail of Shyness and boldness in pumpkinseed sunfish: individual differences are context-specific

Research paper thumbnail of Responses to the Human Intruder Test are related to hair cortisol phenotype and sex in rhesus macaques ( Macaca mulatta )

American Journal of Primatology, 2016

Measurement of cortisol in hair provides a chronic index of hypothalamic-pituitary-adrenal (HPA) ... more Measurement of cortisol in hair provides a chronic index of hypothalamic-pituitary-adrenal (HPA) axis activity and has been applied to assessments of temperament (stable behavioral differences between individuals). However, the extent to which chronically high HPA axis activity relates to a correspondingly high degree of behavioral reactivity is as yet unknown. Therefore, the goal of the present experiment was to assess the relationship between hair cortisol and a reactive temperament. We administered the Human Intruder Test (HIT) twice to 145 (80 male) rhesus macaques (Macaca mulatta) in order to assess behavioral reactivity. The HIT presents monkeys with an unfamiliar experimenter and is composed of a Baseline phase (no intruder) followed by three experimental phases in which the orientation of the intruder changes (Profile, Stare, Back). Behavioral responses to the test were videotaped and behaviors thought to reflect a reactive response to the intruder were scored for duration. Hair samples collected within ±1 month of the first HIT session were analyzed for cortisol by enzyme immunoassay. Subjects were assigned to three groups based on hair cortisol concentration: high, intermediate, and low cortisol phenotypes. Monkeys with the high cortisol phenotype were more reactive to the presence of the intruder than those with the low cortisol phenotype: they were more aggressive, scratched more, and spent more time in the back half of the cage. Males yawned significantly more while females spent more time immobile and in the back of the cage. Overall, monkeys with higher hair cortisol demonstrated an exaggerated response to the presence of the human intruder, supporting a relationship between high levels of chronic HPA axis activity and a reactive temperament. These results indicate that high levels of HPA axis activity, which may result from either genetic variation or environmental stress, correspond with heightened behavioral responses to a stressful experience. Am. J. Primatol. 9999:1-10, 2016. © 2016 Wiley Periodicals, Inc.

Research paper thumbnail of Hair Loss and Hypothalamic–Pituitary–Adrenocortical Axis Activity in Captive Rhesus Macaques (Macaca mulatta)

Journal of the American Association For Laboratory Animal Science Jaalas, 2014

Research paper thumbnail of The correlation between alopecia and temperament in rhesus macaques (Macaca mulatta) at four primate facilities

American journal of primatology, Jan 18, 2015

Alopecia is a ubiquitous, multifaceted problem at facilities caring for captive rhesus macaques. ... more Alopecia is a ubiquitous, multifaceted problem at facilities caring for captive rhesus macaques. There is a wide range of potential etiologies for the hair loss, including compromised immune function, dermatological pathologies, and environmental factors. However, few studies have examined whether various temperamental traits affect vulnerability to develop alopecia. We examined the correlation between alopecia and temperament in 101 (51M) indoor-housed rhesus macaques at four national primate centers. We utilized a cage side version of the Human Intruder test (HIT) to assess response to four conditions: no human present (Alone), human intruder standing next to the cage without making eye contact (Profile), intruder making direct eye contact (Stare) and intruder with back turned (Back). Behavior from all videos was quantified at one facility. We used generalized linear modeling to examine the relationship between behavior on the HIT and alopecia, controlling for facility, age, and s...

Research paper thumbnail of Evaluation of environmental and intrinsic factors that contribute to stereotypic behavior in captive rhesus macaques (Macaca mulatta)

Applied Animal Behaviour Science, 2015

Research paper thumbnail of Training rhesus macaques for venipuncture using positive reinforcement techniques: a comparison with chimpanzees

Journal of the American Association for Laboratory Animal Science: JAALAS

As more emphasis is placed on enhancing the psychological well-being of nonhuman primates, many r... more As more emphasis is placed on enhancing the psychological well-being of nonhuman primates, many research facilities have started using positive reinforcement training (PRT) techniques to train primates to voluntarily participate in husbandry and research procedures. PRT increases the animal's control over its environment and desensitizes the animal to stressful stimuli. Blood draw is a common husbandry and research procedure that can be particularly stressful for nonhuman primate subjects. Although studies have demonstrated that chimpanzees can be trained for in-cage venipuncture using PRT only, fewer studies have demonstrated success using similar techniques to train macaques. It is often assumed that macaques cannot be trained in the same manner as apes. In this study, we compare PRT data from singly housed adult rhesus macaques (Macaca mulatta; n = 8) with data from group-housed adult chimpanzees (Pan troglodytes; n = 4). All subjects were trained to place an arm in a 'bl...

Research paper thumbnail of Hair loss and hair-pulling in rhesus macaques (Macaca mulatta)

Journal of the American Association for Laboratory Animal Science : JAALAS, 2013

Alopecia is a common problem in rhesus macaque colonies. A possible cause of this condition is ha... more Alopecia is a common problem in rhesus macaque colonies. A possible cause of this condition is hair-pulling; however the true relationship between hair-pulling and alopecia is unknown. The purpose of this study was to examine the relationship between hair loss and hair-pulling in 1258 rhesus macaques housed in 4 primate colonies across the United States. Alopecia levels ranged from 34.3% to 86.5% (mean, 49.3%) at the primate facilities. At facilities reporting a sex-associated difference, more female macaques were reported to exhibit alopecia than were males. In contrast, more males were reported to hair-pull. Animals reported to hair-pull were significantly more likely to have some amount of alopecia, but rates of hair-pulling were substantially lower than rates of alopecia, ranging from 0.6% to 20.5% (mean, 7.7%) of the populations. These results further demonstrate that hair-pulling plays only a small role in alopecia in rhesus macaques.

Research paper thumbnail of Dry bedding provides cost-effective enrichment for group-housed rhesus macaques (Macaca mulatta)

Journal of the American Association for Laboratory Animal Science : JAALAS, 2013

Dry bedding has been shown to be an effective enrichment strategy for small groups of captive non... more Dry bedding has been shown to be an effective enrichment strategy for small groups of captive nonhuman primates housed in cages or in small enclosures with concrete flooring. However, dry bedding is used infrequently for large groups because of the perception that its use is time- and resource-intensive. We investigated the cost-effectiveness of this enrichment strategy in large groups (30 to 50 subjects) of rhesus macaques. Macaques were housed under 3 comparison conditions for 4 wk: pine shavings (n = 4), aspen and pine shaving mixture (n = 4), and nonbedded control (n = 4). As measures of resource consumption, husbandry tasks were documented by using time-in-motion methodology, and water usage was determined. In addition, groups underwent behavioral observations to assess the effect of dry bedding. The time required to care for units did not differ between bedded and nonbedded units. However, significantly less water was used for sanitization of bedded compared with nonbedded uni...

Research paper thumbnail of Training rhesus macaques for venipuncture using positive reinforcement techniques: a comparison with chimpanzees

Journal of the American Association for Laboratory Animal Science : JAALAS, 2008

As more emphasis is placed on enhancing the psychological well-being of nonhuman primates, many r... more As more emphasis is placed on enhancing the psychological well-being of nonhuman primates, many research facilities have started using positive reinforcement training (PRT) techniques to train primates to voluntarily participate in husbandry and research procedures. PRT increases the animal's control over its environment and desensitizes the animal to stressful stimuli. Blood draw is a common husbandry and research procedure that can be particularly stressful for nonhuman primate subjects. Although studies have demonstrated that chimpanzees can be trained for in-cage venipuncture using PRT only, fewer studies have demonstrated success using similar techniques to train macaques. It is often assumed that macaques cannot be trained in the same manner as apes. In this study, we compare PRT data from singly housed adult rhesus macaques (Macaca mulatta; n = 8) with data from group-housed adult chimpanzees (Pan troglodytes; n = 4). All subjects were trained to place an arm in a 'bl...

Research paper thumbnail of Assessing anxiety in nonhuman primates

ILAR journal / National Research Council, Institute of Laboratory Animal Resources, 2014

Anxiety can be broadly described as a psychological state in which normally innocuous environment... more Anxiety can be broadly described as a psychological state in which normally innocuous environmental stimuli trigger negative emotional expectations. Human anxiety disorders are multidimensional and may be organic or acquired, situational or pervasive. The broad ranging nature of the anxiety phenotype speaks to the need for models that identify its various components and root causes to develop effective clinical treatments. The cross-species comparative approach to modeling anxiety disorders in animals aims to understand mechanisms that both contribute to and modulate anxiety. Nonhuman primate models provide an important bridge from nonprimate model systems because of the complexity of nonhuman primates' biobehavioral capacities and their commonalities with human emotion. The broad goal of this review is to provide an overview of various procedures available to study anxiety in the nonhuman primate, with a focus on the behavioral aspects of anxiety. Commonly used methods covered ...

Research paper thumbnail of Using Porches to Decrease Feces Painting in Rhesus Macaques (Macaca mulatta)

Journal of the American Association for Laboratory Animal Science : JAALAS, 2014

The goal of this project was to evaluate the efficacy of a porch in decreasing feces painting in ... more The goal of this project was to evaluate the efficacy of a porch in decreasing feces painting in captive rhesus macaques. The porch is a small extension that is hung on the outside of a monkey's primary home cage. Porches provide many potential benefits to indoor-housed macaques, including opportunities to perch above the ground, additional space, and increased field of view. Rates of feces painting, an abnormal behavior in which the animal smears or rubs feces on a surface, were compared in 3 situations: with porch enrichment, with 'smear board' enrichment (a foraging device commonly used to decrease feces painting), and without either enrichment item. Feces painting was evaluated daily by using a 5-point scale that ranged from 0, no feces present, to 4, multiple large areas of feces. We found that subjects received significantly lower feces painting scores when given porch enrichment or smear board enrichment compared with baseline. Furthermore, subjects received signi...

Research paper thumbnail of Behavioral Management, Enrichment, and Psychological Well-being of Laboratory Nonhuman Primates

Nonhuman Primates in Biomedical Research, 2012

Research paper thumbnail of Chronic Consumption of a High-Fat Diet during Pregnancy Causes Perturbations in the Serotonergic System and Increased Anxiety-Like Behavior in Nonhuman Primate Offspring

Journal of Neuroscience, 2010

Research paper thumbnail of Introduction: Models for primate behavior

Research paper thumbnail of IACUC Review of Nonhuman Primate Research

Research paper thumbnail of Behavioral and Ecological Determinants of Home Range Size in Juvenile Pumpkinseed Sunfish (Lepomis gibbosus)

Research paper thumbnail of Anxious Behavior and Fenfluramine-Induced Prolactin Secretion in Young Rhesus Macaques with Different Alleles of the Serotonin Reuptake Transporter Polymorphism (5HTTLPR)

Behavior Genetics, 2000

Anxiety is a normal aspect of human personality, which can manifest in a variety of disorders and... more Anxiety is a normal aspect of human personality, which can manifest in a variety of disorders and other negative traits. The primary treatment for anxiety is the class of drugs known as the selective serotonin reuptake inhibitors (SSRIs), which bind to the serotonin reuptake transporter. The upstream region of the gene that codes for this transporter contains a polymorphism that is an insertion/deletion event that in turn, produces long (l) and short (s) alleles in the population. This particular polymorphism in the serotonin transporter, the 5HTTLPR (serotonin transporter linked polymorphic region), is thought to be involved in the genesis of anxious traits and disorders. Most studies with human subjects have examined adult behavior, which may derive from diverse experiential and environmental backgrounds, as well as genetic differences. To better isolate the effect of genetics, we genotyped 128 infant and juvenile monkeys for the 5HTTLPR and tested for behavioral response in four testing paradigms designed to elicit fearful-anxious behaviors: a free play, remote-controlled car, human intruder, and novel fruit test. The s/s monkeys were found to be behaviorally inhibited in the free play test, engaged in more fear behaviors in the remote-controlled car test, and threatened more in the stare portion of the human intruder test, even though a small number of monkeys were assessed. There was no difference between genotypes of either sex in the prolactin response to fenfluramine. These data indicate greater anxiety in the s/s monkeys for distinct facets of anxious behavior, which are independent of a global neurohormonal challenge test. These neurobehavioral data support recent neuroimaging findings in humans indicating the importance of the 5HTTLPR for amygdala-dependent anxious behavior.

Research paper thumbnail of The use of positive reinforcement training to reduce stereotypic behavior in rhesus macaques

Applied Animal Behaviour Science, 2010

Research paper thumbnail of Reply from D.S. Wilson et al

Trends in Ecology & Evolution, 1995

Research paper thumbnail of Shyness and boldness in humans and other animals

Trends in Ecology & Evolution, 1994

Research paper thumbnail of Shyness and boldness in pumpkinseed sunfish: individual differences are context-specific

Research paper thumbnail of Responses to the Human Intruder Test are related to hair cortisol phenotype and sex in rhesus macaques ( Macaca mulatta )

American Journal of Primatology, 2016

Measurement of cortisol in hair provides a chronic index of hypothalamic-pituitary-adrenal (HPA) ... more Measurement of cortisol in hair provides a chronic index of hypothalamic-pituitary-adrenal (HPA) axis activity and has been applied to assessments of temperament (stable behavioral differences between individuals). However, the extent to which chronically high HPA axis activity relates to a correspondingly high degree of behavioral reactivity is as yet unknown. Therefore, the goal of the present experiment was to assess the relationship between hair cortisol and a reactive temperament. We administered the Human Intruder Test (HIT) twice to 145 (80 male) rhesus macaques (Macaca mulatta) in order to assess behavioral reactivity. The HIT presents monkeys with an unfamiliar experimenter and is composed of a Baseline phase (no intruder) followed by three experimental phases in which the orientation of the intruder changes (Profile, Stare, Back). Behavioral responses to the test were videotaped and behaviors thought to reflect a reactive response to the intruder were scored for duration. Hair samples collected within ±1 month of the first HIT session were analyzed for cortisol by enzyme immunoassay. Subjects were assigned to three groups based on hair cortisol concentration: high, intermediate, and low cortisol phenotypes. Monkeys with the high cortisol phenotype were more reactive to the presence of the intruder than those with the low cortisol phenotype: they were more aggressive, scratched more, and spent more time in the back half of the cage. Males yawned significantly more while females spent more time immobile and in the back of the cage. Overall, monkeys with higher hair cortisol demonstrated an exaggerated response to the presence of the human intruder, supporting a relationship between high levels of chronic HPA axis activity and a reactive temperament. These results indicate that high levels of HPA axis activity, which may result from either genetic variation or environmental stress, correspond with heightened behavioral responses to a stressful experience. Am. J. Primatol. 9999:1-10, 2016. © 2016 Wiley Periodicals, Inc.

Research paper thumbnail of Hair Loss and Hypothalamic–Pituitary–Adrenocortical Axis Activity in Captive Rhesus Macaques (Macaca mulatta)

Journal of the American Association For Laboratory Animal Science Jaalas, 2014

Research paper thumbnail of The correlation between alopecia and temperament in rhesus macaques (Macaca mulatta) at four primate facilities

American journal of primatology, Jan 18, 2015

Alopecia is a ubiquitous, multifaceted problem at facilities caring for captive rhesus macaques. ... more Alopecia is a ubiquitous, multifaceted problem at facilities caring for captive rhesus macaques. There is a wide range of potential etiologies for the hair loss, including compromised immune function, dermatological pathologies, and environmental factors. However, few studies have examined whether various temperamental traits affect vulnerability to develop alopecia. We examined the correlation between alopecia and temperament in 101 (51M) indoor-housed rhesus macaques at four national primate centers. We utilized a cage side version of the Human Intruder test (HIT) to assess response to four conditions: no human present (Alone), human intruder standing next to the cage without making eye contact (Profile), intruder making direct eye contact (Stare) and intruder with back turned (Back). Behavior from all videos was quantified at one facility. We used generalized linear modeling to examine the relationship between behavior on the HIT and alopecia, controlling for facility, age, and s...

Research paper thumbnail of Evaluation of environmental and intrinsic factors that contribute to stereotypic behavior in captive rhesus macaques (Macaca mulatta)

Applied Animal Behaviour Science, 2015

Research paper thumbnail of Training rhesus macaques for venipuncture using positive reinforcement techniques: a comparison with chimpanzees

Journal of the American Association for Laboratory Animal Science: JAALAS

As more emphasis is placed on enhancing the psychological well-being of nonhuman primates, many r... more As more emphasis is placed on enhancing the psychological well-being of nonhuman primates, many research facilities have started using positive reinforcement training (PRT) techniques to train primates to voluntarily participate in husbandry and research procedures. PRT increases the animal's control over its environment and desensitizes the animal to stressful stimuli. Blood draw is a common husbandry and research procedure that can be particularly stressful for nonhuman primate subjects. Although studies have demonstrated that chimpanzees can be trained for in-cage venipuncture using PRT only, fewer studies have demonstrated success using similar techniques to train macaques. It is often assumed that macaques cannot be trained in the same manner as apes. In this study, we compare PRT data from singly housed adult rhesus macaques (Macaca mulatta; n = 8) with data from group-housed adult chimpanzees (Pan troglodytes; n = 4). All subjects were trained to place an arm in a 'bl...

Research paper thumbnail of Hair loss and hair-pulling in rhesus macaques (Macaca mulatta)

Journal of the American Association for Laboratory Animal Science : JAALAS, 2013

Alopecia is a common problem in rhesus macaque colonies. A possible cause of this condition is ha... more Alopecia is a common problem in rhesus macaque colonies. A possible cause of this condition is hair-pulling; however the true relationship between hair-pulling and alopecia is unknown. The purpose of this study was to examine the relationship between hair loss and hair-pulling in 1258 rhesus macaques housed in 4 primate colonies across the United States. Alopecia levels ranged from 34.3% to 86.5% (mean, 49.3%) at the primate facilities. At facilities reporting a sex-associated difference, more female macaques were reported to exhibit alopecia than were males. In contrast, more males were reported to hair-pull. Animals reported to hair-pull were significantly more likely to have some amount of alopecia, but rates of hair-pulling were substantially lower than rates of alopecia, ranging from 0.6% to 20.5% (mean, 7.7%) of the populations. These results further demonstrate that hair-pulling plays only a small role in alopecia in rhesus macaques.

Research paper thumbnail of Dry bedding provides cost-effective enrichment for group-housed rhesus macaques (Macaca mulatta)

Journal of the American Association for Laboratory Animal Science : JAALAS, 2013

Dry bedding has been shown to be an effective enrichment strategy for small groups of captive non... more Dry bedding has been shown to be an effective enrichment strategy for small groups of captive nonhuman primates housed in cages or in small enclosures with concrete flooring. However, dry bedding is used infrequently for large groups because of the perception that its use is time- and resource-intensive. We investigated the cost-effectiveness of this enrichment strategy in large groups (30 to 50 subjects) of rhesus macaques. Macaques were housed under 3 comparison conditions for 4 wk: pine shavings (n = 4), aspen and pine shaving mixture (n = 4), and nonbedded control (n = 4). As measures of resource consumption, husbandry tasks were documented by using time-in-motion methodology, and water usage was determined. In addition, groups underwent behavioral observations to assess the effect of dry bedding. The time required to care for units did not differ between bedded and nonbedded units. However, significantly less water was used for sanitization of bedded compared with nonbedded uni...

Research paper thumbnail of Training rhesus macaques for venipuncture using positive reinforcement techniques: a comparison with chimpanzees

Journal of the American Association for Laboratory Animal Science : JAALAS, 2008

As more emphasis is placed on enhancing the psychological well-being of nonhuman primates, many r... more As more emphasis is placed on enhancing the psychological well-being of nonhuman primates, many research facilities have started using positive reinforcement training (PRT) techniques to train primates to voluntarily participate in husbandry and research procedures. PRT increases the animal's control over its environment and desensitizes the animal to stressful stimuli. Blood draw is a common husbandry and research procedure that can be particularly stressful for nonhuman primate subjects. Although studies have demonstrated that chimpanzees can be trained for in-cage venipuncture using PRT only, fewer studies have demonstrated success using similar techniques to train macaques. It is often assumed that macaques cannot be trained in the same manner as apes. In this study, we compare PRT data from singly housed adult rhesus macaques (Macaca mulatta; n = 8) with data from group-housed adult chimpanzees (Pan troglodytes; n = 4). All subjects were trained to place an arm in a 'bl...

Research paper thumbnail of Assessing anxiety in nonhuman primates

ILAR journal / National Research Council, Institute of Laboratory Animal Resources, 2014

Anxiety can be broadly described as a psychological state in which normally innocuous environment... more Anxiety can be broadly described as a psychological state in which normally innocuous environmental stimuli trigger negative emotional expectations. Human anxiety disorders are multidimensional and may be organic or acquired, situational or pervasive. The broad ranging nature of the anxiety phenotype speaks to the need for models that identify its various components and root causes to develop effective clinical treatments. The cross-species comparative approach to modeling anxiety disorders in animals aims to understand mechanisms that both contribute to and modulate anxiety. Nonhuman primate models provide an important bridge from nonprimate model systems because of the complexity of nonhuman primates' biobehavioral capacities and their commonalities with human emotion. The broad goal of this review is to provide an overview of various procedures available to study anxiety in the nonhuman primate, with a focus on the behavioral aspects of anxiety. Commonly used methods covered ...

Research paper thumbnail of Using Porches to Decrease Feces Painting in Rhesus Macaques (Macaca mulatta)

Journal of the American Association for Laboratory Animal Science : JAALAS, 2014

The goal of this project was to evaluate the efficacy of a porch in decreasing feces painting in ... more The goal of this project was to evaluate the efficacy of a porch in decreasing feces painting in captive rhesus macaques. The porch is a small extension that is hung on the outside of a monkey's primary home cage. Porches provide many potential benefits to indoor-housed macaques, including opportunities to perch above the ground, additional space, and increased field of view. Rates of feces painting, an abnormal behavior in which the animal smears or rubs feces on a surface, were compared in 3 situations: with porch enrichment, with 'smear board' enrichment (a foraging device commonly used to decrease feces painting), and without either enrichment item. Feces painting was evaluated daily by using a 5-point scale that ranged from 0, no feces present, to 4, multiple large areas of feces. We found that subjects received significantly lower feces painting scores when given porch enrichment or smear board enrichment compared with baseline. Furthermore, subjects received signi...

Research paper thumbnail of Behavioral Management, Enrichment, and Psychological Well-being of Laboratory Nonhuman Primates

Nonhuman Primates in Biomedical Research, 2012

Research paper thumbnail of Chronic Consumption of a High-Fat Diet during Pregnancy Causes Perturbations in the Serotonergic System and Increased Anxiety-Like Behavior in Nonhuman Primate Offspring

Journal of Neuroscience, 2010

Research paper thumbnail of Introduction: Models for primate behavior

Research paper thumbnail of IACUC Review of Nonhuman Primate Research

Research paper thumbnail of Behavioral and Ecological Determinants of Home Range Size in Juvenile Pumpkinseed Sunfish (Lepomis gibbosus)

Research paper thumbnail of Anxious Behavior and Fenfluramine-Induced Prolactin Secretion in Young Rhesus Macaques with Different Alleles of the Serotonin Reuptake Transporter Polymorphism (5HTTLPR)

Behavior Genetics, 2000

Anxiety is a normal aspect of human personality, which can manifest in a variety of disorders and... more Anxiety is a normal aspect of human personality, which can manifest in a variety of disorders and other negative traits. The primary treatment for anxiety is the class of drugs known as the selective serotonin reuptake inhibitors (SSRIs), which bind to the serotonin reuptake transporter. The upstream region of the gene that codes for this transporter contains a polymorphism that is an insertion/deletion event that in turn, produces long (l) and short (s) alleles in the population. This particular polymorphism in the serotonin transporter, the 5HTTLPR (serotonin transporter linked polymorphic region), is thought to be involved in the genesis of anxious traits and disorders. Most studies with human subjects have examined adult behavior, which may derive from diverse experiential and environmental backgrounds, as well as genetic differences. To better isolate the effect of genetics, we genotyped 128 infant and juvenile monkeys for the 5HTTLPR and tested for behavioral response in four testing paradigms designed to elicit fearful-anxious behaviors: a free play, remote-controlled car, human intruder, and novel fruit test. The s/s monkeys were found to be behaviorally inhibited in the free play test, engaged in more fear behaviors in the remote-controlled car test, and threatened more in the stare portion of the human intruder test, even though a small number of monkeys were assessed. There was no difference between genotypes of either sex in the prolactin response to fenfluramine. These data indicate greater anxiety in the s/s monkeys for distinct facets of anxious behavior, which are independent of a global neurohormonal challenge test. These neurobehavioral data support recent neuroimaging findings in humans indicating the importance of the 5HTTLPR for amygdala-dependent anxious behavior.

Research paper thumbnail of The use of positive reinforcement training to reduce stereotypic behavior in rhesus macaques

Applied Animal Behaviour Science, 2010