Comparative Psychology Commons^™

A Preliminary Investigation Of The Construct Of Psychopathic Personality (Psychopathy) In Chimpanzees (Pan Troglodytes), Scott O. Lilienfeld, Jonathan Gershon, Marshall Duke, Lori Marino, Frans B. M. De Waal

Sentience Collection

Although the construct of psychopathy has received considerable attention in humans, its relevance to other animals is largely unknown. We developed a measure of psychopathy for use in chimpanzees (Pan troglodytes), the Chimpanzee Psychopathy Measure (CPM), and asked 6 raters to complete this index on 34 chimpanzees. The CPM (a) demonstrated satisfactory interrater reliability and internal consistency; (b) exhibited marginally significant sex differences (males > females); (c) correlated positively with measures of extraversion, agreeableness, and observational ratings of agonism, sexual activity, daring behaviors, teasing, silent bluff displays, and temper tantrums, and negatively with observational ratings of generosity; and (d) demonstrated incremental …

Scale-Model Comprehension By Chimpanzees (Pan Troglodytes), Valerie A. Kuhlmeier, Sarah T. Boysen, Kimberly L. Mukobi

Sentience Collection

The ability of chimpanzees (Pan troglodytes) to recognize the correspondence between a scale model and its real-world referent was examined. In Experiments 1 and 2, an adult female and a young adult male watched as an experimenter hid a miniature model food in 1 of 4 sites in a scale model. Then, the chimpanzees were given the opportunity to find the real food item that had been hidden in the analogous location in the real room. The female performed significantly above chance, whereas the male performed at chance level. Experiments 3 and 4 tested 5 adult and 2 adolescent chimpanzees …

Social Mechanisms Enhance Escape Responses In Shoals Of Rainbowfish, Melanotaenia Duboulayi, Culum Brown, Kevin Warburton

Aquaculture Collection

Shoaling behaviour has been shown to provide many benefits to group members. In this study we examined the ability of fish shoals to escape from a novel trawl apparatus. Fish in shoals of 5 found, and escaped through, a hole in the oncoming trawl more quickly than fish in pairs. Fish in the larger shoals displayed a significant decrease in escape latencies over a series of five trawls, providing clear evidence of net avoidance learning, whereas fish in pairs showed no evidence of learning over successive runs. Observations suggested that more information on the location of the escape route was …

Predicting Flock Vigilance From Simple Passerine Interactions: Modelling With Cellular Automata, David B. Bahr, Marc Bekoff

Ethology Collection

Vigilance in flocks can be described and modelled as a plausible set of local interactions between neighbouring birds. Each bird in the modelled flock chooses to feed or to scan based solely on whether or not its neighbours are feeding or scanning. This simple model has the ability both to reproduce observations that have not been previously explained and to predict flock behaviours that might be confirmed with future field studies. Examples include simulations showing decreased vigilance with increased flock size (as observed in the field), greater time spent scanning when obstacles such as trees are present (as observed) and …

Asymmetry And Fighting Performance In The Shore Crab Carcinus Maenas, Lynne U. Sneddon, John P. Swaddle

Veterinary Science and Medicine Collection

Fluctuating asymmetries (left–right differences in symmetric traits) can be negatively related to fitness parameters in a number of biological systems. Hence, it has been suggested that symmetric individuals should outcompete asymmetric individuals during intraspecific agonistic encounters. However, there is a lack of experimental evidence for such a relationship. We investigated the relationship between trait asymmetry (both directional and fluctuating asymmetry) and the outcome of agonistic encounters among size-matched male shore crabs. Our findings indicate that cheliped (‘weapon claw’) directional asymmetry is not related to the outcome of fights, whereas fluctuating asymmetry in the fifth pereiopod, but not the second pereiopod, …

Overcoming Response Bias Using Symbolic Representations Of Number By Chimpanzees (Pan Troglodytes), Sarah T. Boysen, Kimberly L. Mukobi, Gary G. Berntson

Sentience Collection

We previously reported that chimpanzees were unable to optimally select the smaller of two candy arrays in order to receive a larger reward. When Arabic numerals were substituted for the candy arrays, animals who had had prior training with numerical symbols showed an immediate and significant improvement in performance and were able to select reliably the smaller numeric representation in order to obtain a larger reward. Poor performance with candy arrays was interpreted as reflecting a response bias toward the intrinsic incentive and/or perceptual features of the larger array. In contrast, the Arabic numerals represent numerosity symbolically and appear to …

The Effects Of Color Contrast On Performance Of The Wais-R Digit Symbol Subtest, Wendell S. Francke

Theses, Dissertations and Capstones

Color contrast has been shown to aid in visual search tasks using electronic displays, while the research regarding the usefulness of color contrast in aiding visual search using a paper medium is mixed. The present study questions whether subjects’ performance will improve on a paper task where the search target is in high color contrast when compared with a task where the target color does not differ from the rest of the search field.

Thirty-nine adults with normal vision were administered two forms of the WAIS-R digit symbol subtest, one with low chromatic contrast and one with high chromatic contrast, …

Comparing Aggression Between Young-Adult And General Admission Patients In A State-Inpatient Psychiatric Hospital, Jill Kridle

Theses, Dissertations and Capstones

Because of the inherent danger surrounding violence, aggression studies are particularly important for those working in a health care setting. A constant variable in aggression studies that poses many risk factors is age. This study examined characteristics of aggressors contained on state psychiatric hospital, located in West Virginia. Included on the unit was the neo-adult program and some general admission patients. The study evaluated all aggressors on the unit between September 1997 and August 1998. Comparisons were made to distinguish any possible differences or similarities between the two groups. The results indicated some differences relating to age of aggressor. Young-adult …

Does The Intermediate Booklet Category Test Detect Neurological Deficits In Adhd Children?, Mindy B. Layne

Theses, Dissertations and Capstones

The purpose of this study was to evaluate the capability of the Intermediate Booklet Category Test (EBCT) detecting neurological deficits among ADHD children. The study included thirty children between the ages of 9 and 14 years with at least an Average IQ. Fifteen of the children were previously diagnosed with ADHD and the other fifteen children did not have any ADHD diagnosis.

The Effect Of Music On Visuospatial Memory, James L. Mccracken

Theses, Dissertations and Capstones

Music was utilized in an attempt to enhance visuospatial memory. Twenty-eight individuals, who attended a United Methodist Church in southern West Virginia, were randomly assigned to experimental and control conditions. The experimental group was exposed to new age and classical compositions, counterbalanced for order effects. The new age and classical selections were of similar tempo and complexity. The control group received two relaxation periods, of a comparable length to the music presented to the experimental group. The 7/24 Spatial Recall Test was used to measure visuospatial memory. The measure was administered to each participant immediately after exposure to the music …

Behavioral Interactions And Conflict Among Domestic Dogs, Black-Tailed Prairie Dogs, And People In Boulder, Colorado, Marc Bekoff, Robert W. Ickes

Ethology Collection

Interactions among domestic dogs (Canis familiaris), black-tailed prairie dogs (Cynomys ludovicianus), and people were studied at Dry Creek, Boulder, Colorado. Our objective was to develop a basic understanding of the nature of dog–prairie dog interactions in this recreational area, because this is an issue that has high visibility and over which there is conflict in Boulder: There are those who want dogs to run free regardless of their impact on the behavior and lives of prairie dogs and those who want to protect prairie dogs and have dogs restrained or go elsewhere. We found that dogs clearly influenced the behavior …