Theses
Dar
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The following are abstracts of theses first published
in Friends of Washoe Newsletters. To order the newsletter with
the text of the entire theses, please contact CHCI.
Spring 2008 - Jessica Belle Martison
SORTING CHIMPANZEE DRAWINGS BASED ON SIMILIARITY
OF FORM
Friends of Washoe, Spring 2008, Volume 29, No.
3 Abstract:
This study examined humans' perception of similarity
of form in chimpanzee drawings. Moja, a cross-fostered chimpanzee,
drew 36 drawings of seven familiar objects. Experimenters selected
seven exemplars and instruced 77 human participants to sort
the remaining 28 drawings into a stack based on its similarity
of of form to the exemplar. A multidimensional scaling analysis
showed that participants perceived similarity of form in three
of the seven objects drew, including cup, boot and banana.
Winter 2008 – Trijntje Laurel Marburg
A COMPARISON OF INTRAGROUP GREETING AND
REASSURANCE BEHAVIORS ACROSS FOUR CHIMPANZEE (PAN TROGLODYTES)
SOCIAL GROUPS IN AMERICAN AND AFRICAN SANCTUARIES
Friends of Washoe,Winter 2008, Vol. 29 No. 2
Abstract:
In this study, gestures performed in the greeting and reassurance
context were investigated in four groups of chimpanzees living
in American and African sanctuaries. Over 85 hours of video
recording at three African sanctuaries and 798 hours of video
recording at an American sanctuary were analyzed for greeting
and reassurance gestures. The four chimpanzee groups demonstrated
various differences in both greeting and reassurance gestures.
Groups differed in the proportion of time spent in each context,
the gesture frequency per minute, and the gesture types used.
Some gestures were group specific, meaning they occurred only
in one group; some gestures were group typical, meaning they
occurred in some but not all groups; and some gestures occurred
in all groups and are candidates for chimpanzee universals.
Within gestures found in all groups, systematic variations in
placement were investigated. Gestures differed in placement
locations of gestures, similar to those found in human cultures.
Fall 2007 – Jason M. Wallin
PLAY, LAUGHTER, AND HUMOR IN CAPTIVE CHIMPANZEES (PAN
TROGLODYTES)
Friends of Washoe, Fall 2007, Vol. 29 No. 1
Abstract:
Play is ubiquitous in mammals, and argued to occur across many
taxa including birds, non-avian reptiles, and invertebrates.
Laughter is common in human interactions, and growing evidence
from chimpanzees, rats, and dogs may mean it is also common
among mammals (at least). Humor in non-humans is less well studied,
though theoretical work and anecdotes exist. This study examined
play, laughter, and humor using a longitudinal dataset of narrative
shift reports collected over more than 1,300 days in a unique
family of non-human animals, chimpanzees who use American Sign
Language to communicate. Play was more common when young males
were present as partners; though an adult female played very
frequently as well. Laughter followed the established social
hierarchy, was more common during contact play, and then when
a chimpanzee was the recipient of contact. Humor in these chimpanzees
followed the themes of much of human humor: dominance, aggression,
scatology, and incongruity.
Summer 2007 – Maureen Sophia McCarthy
USE OF GESTURE SEQUENCES IN CAPTIVE CHIMPANZEE (PAN
TROGLODYTES) PLAY
Friends of Washoe, Summer 2007 Vol. 28 No.4
Abstract:
This study examined the use of sensory modalities relative
to a partner’s behavior in gesture sequences during captive
chimpanzee play. The author hypothesized that chimpanzees would
use visual gestures toward attentive recipients and auditory/tactile
gestures toward inattentive recipients. She also hypothesized
that gesture sequences would be more prevalent toward unresponsive
rather than responsive recipients. The chimpanzees used significantly
more auditory/tactile rather than visual gestures first in sequences
with both attentive and inattentive recipients. They rarely
used visual gestures toward inattentive recipients. Visual gestures
were effective only with attentive recipients, but auditory/tactile
gestures were effective with both attentive and inattentive
recipients. Recipients responded significantly more to single
gestures than to first gestures in sequences. Sequences indicated
that recipients did not respond to initial gestures, whereas
effective single gestures made more gestures unnecessary. The
chimpanzees thus gestured appropriately relative to a recipient’s
behavior and modified their interactions according to contextual
social cues.
Spring 2007 – Jennifer Susan Keyser
COMMUNICATIVE ROLE OF PLAY BEHAVIORS IN CAPTIVE CHIMPANZEE
PLAY
Friends of Washoe, Spring 2007 Vol. 28 No.3
Abstract:
Play is ubiquitous across nearly all mammal species (Burghardt,
1984; Fagen 1981), and serves many functions including developing
motor skills, socialization, and enhanced cognitive abilities
(Burghardt, 1984, p.7). In every species in which play has been
examined, behaviors that are exhibited in other contexts such
as threat, also occur during play (Brown, 1988; Fagen 1981;
Loizos, 1967; Pellis & Pellis, 1996). As a result, communication
in the form of play signaling is essential for the continuation
of the play bout. The present study expanded upon the findings
of Jensvold, Sheeran, Halberg, and Keyser (2006) by examining
the function of play faces, contact play, and arousal level
specifically in relation to laughter and play bout duration.
A hierarchical multiple regression revealed a significant positive
correlation between laughter and duration. Duration was also
a significant predicator of arousal level.
Winter 2007 – Julia T. Gallucci
CHIMPANZE THREAT GESTURES:COMMUNITY LEVEL DIFFERENCES
Friends Of Washoe, Winter 2007, Vol. 28 No.2
Abstract:
The author compared threat gesture types and rates of threat
gesturing between one free-living chimpanzee community in Gombe
Stream Reserve, Tanzania, and one captive chimpanzee
community from the Chimpanzee and Human Communication Institute
(CHCI) at Central Washington University in Ellensburg, Washington.
The chimpanzees exhibited community-level
differences. Chimpanzees at Gombe used two group-typical gesture
types and chimpanzees at CHCI used 13 group-typical gesture
types. Chimpanzees at Gombe exhibited more gestures
per hour than chimpanzees at CHCI and chimpanzees at CHCI exhibited
longer gestures than chimpanzees at Gombe. Grouptypical behaviors
provide potential evidence of culture in chimpanzees.
Fall 2005 - Tennyson Egan
CHIMPANZEES EXHIBIT IMAGINARY PLAY
Friends of Washoe, Fall 2005, Number 1
It has been said that imaginary play is unique and limited
to humans. However, it has been found in previous research that
nonhuman species demonstrate imaginary play. In this study,
the researcher investigated imaginary play in a group of five
signing chimpanzees. The researcher viewed and analyzed over
67 hours of videotaped chimpanzee behavior, recorded over an
18-year period, for imaginary play. A total of 21 instances
of imaginary play were found and classified in four of six categories
of imagination. The important conclusion in this study is that
imaginary play is demonstrated by species other than humans.
This study provides evidence that imaginary play represents
a phylogenetic continuity rather than a discontinuity.
Summer 2005 - Deborah J. Tierney
A COMMUNICATIVE COMPETENCE IN FOUR CAPTIVE CHIMPANZEES
AS INDICATED BY RESPONSES TO QUESTIONS VERSUS STATEMENTS
Friends of Washoe, Summer 2005, Number 4
The chimpanzees Washoe, Tatu, and Dar, were cross-fostered
in an American Sign Language environment and treated as conversational
partners by human caregivers. The chimpanzee Loulis was adopted
by Washoe, and acquired his signs from Washoe and other signing
chimpanzees. The current study investigated the responses of
these chimpanzees in two question conditions and two statement
conditions. Responses were divided into four categories. Due
to small sample size, the conditions were collapsed into two
conditions (question/statement) and the response categories
were collapsed into two response categories (signed response/no
signed response). A one-way, Fisher's Exact Test was used for
analysis. The cross-fosterlings often signed in response to
questions and often did not sign in response to statements.
This relationship was significant for Washoe and Tatu (p=.037
and p=.033) and approached significance for Dar (p=.058). Loulis
often signed in response to both questions and statements (p=.324).
Communicative competence is discussed.
Winter 2005 - Cleve Hicks
CHIMPANZEE TOOL USE IN THE NGOTTO FOREST, CENTRAL AFRICAN REPUBLIC.
October 2004 - Shannon Reider
COMMUNITY LEVEL DIFFERENCES IN THE USE OF GROOMING GESTURES.
Friends of Washoe, Spring/Summer 2004, Numbers 3 & 4
ABSTRACT: Use of gestures in the grooming context were compared
between one community of chimpanzees from Kibale National Park
in Uganda, one community from Gombe Stream Reserve in Tanzania,
and the community from the Chimpanzee and Human Communication
Institute (CHCI) at Central Washington University in Ellensburg,
Washington. Community level differences were found. The foothold,
handhold, and the signs of American Sign Language were used
at CHCI and not found in the free-living communities. One gesture,
the grooming handclasp, was found only at Kibale. The foothold,
the handhold, the signs of ASL, and the grooming handclasp are
good candidates for culturally determined gestural dialects.
All communities used a majority of their gestures to maintain
grooming.
June 2003 – Holly Bowman
INTERACTIONS BETWEEN CAPTIVE CHIMPANZEES AND THEIR HUMAN
CAREGIVERS IN CAPTIVE SETTINGS: THE EFFECTS OF GESTURAL COMMUNICATION
ON RECIPROCITY
Friends of Washoe, Fall 2003, Volume 25,Number 1.
ABSTRACT: The types of communicative behaviors used during
interactions between captive chimpanzees and human caregivers
can have profound effects on the chimpanzees' psychological
well-being. Auditory, tactile and visual communicative behaviors
used during these interactions were studied at two different
facilities: the Fauna Foundation, a private sanctuary with non-signing
chimpanzees and caregivers; and the Chimpanzee and Human Communication
Institute (CHCI), a university-based sanctuary with both signing
chimpanzees and caregivers. Eighteen chimpanzees and 10 caregivers
were observed during meal service for 30 hours over the course
of approximately two weeks per facility. Results indicate differences
in the types of communicative behaviors used, and these differences
depend on the facility where the chimpanzees reside and the
orientation of the human caregiver. Implications for captive
management are discussed.
May 2003 - Lesley Lynn Daspit
FOLKBIOLOGY OF THE BOFI FORAGERS AND FARMERS IN CENTRAL
AFRICA: INDIGENOUS KNOWLEDGE OF FOREST ANIMALS
Friends of Washoe, Summer 2003, Volume 4, Number 4.
May 2001 - Sarah Angela Baeckler
CHIPMANZEE-CAREGIEVR INTERACTIONS IN CAPTIVE SETTINGS:
THE EFFECTS OF "CULTURES" OF CAPTIVE MANAGEMENT
Friends of Washoe, Fall 2001, Volume 23, Number 1.
ABSTRACT: Interactions between chimpanzees and human caregivers
can have profound effects on both the humans and the chimpanzees.
These interactions were studied at three different facilities.
Twenty-one chimpanzees and five caregivers were observed during
their daily interactions over the course of approximately two
weeks per facility. Results indicate differences in the types
and styles of interactions that take place at each facility,
and the relationships between the chimpanzees and their caregivers.
Implications for captive management are discussed.
May 2001 - John Blaine Mulcahy
PRECONFLICT BEHAVIOR IN A SMALL GROUP OF CHIMPANZEES
Friends of Washoe, Summer 2001, Volume 22, Number 3.
August, 2000 - Diana Jean Goodrich
PLAY INITIATION IN ADULT CHIMPANZEES
Friends of Washoe, Winter 2001, Volume 22, Number 2.
July 2000 - Gabriel Saul Waters
SYMPATHETIC MOUTH MOVEMENTS ACCOMPANYING FINE MOTOR
MOVEMENTS IN FIVE CAPTIVE CHIMPANZEES (Pan troglodytes)
Friends of Washoe, Summer 2000, Volume 20, Number 7.
June 2000 – Lorien Vaughan
THE USE OF HIGH AROUSAL AMERICAN SIGN LANGUAGE COMMUNICATION
DURING CONFLICT AND POST-CONFLCT PERIODS BY A GROUP OF FIVE
CAPTIVE CHIMPANZEES (Pan troglodytes)
Friends of Washoe, Fall 2000, Volume 21, Number 8.
May 2000 - Adriana Martin
ROLE OF DELAY IN MODE OF INITIATION AND SUBSEQUENT REPAIR
OF COMMUNICATIVE INTERACTION BY CHIMPANZEES (Pan troglodytes)
TOWARD HUMAN WITH EYES OPEN OR CLOSED
Friends of Washoe, Spring 2000, Volume 20, Number 6.
August 1999 - Bonita Aline King
THE EFFECT OF FAMILIARITY ON SOCIAL INTERACTIONS BETWEEN
CAPTIVE CHIMPANZEES (Pan troglodytes) AND HUMANS (Homo sapiens)
Friends of Washoe, Winter 2000, Volume 20, Number 5.
June 1999 – Marcee J. Harvey
SECONDARY TOOL MODIFICATION BY CAPTIVE CHIMPANZEES
Friends of Washoe, Summer/Fall 1998, Volume 19, Numbers 3 &
4.
March 1999 - Crickette Marie Sanz
FECAL TESTOSTERONE AND CORTICOSTERONE LEVELS AND BEHAVIORAL
CORRELATES IN A SOCIALLY STABLE GROUP OF FIVE CAPTIVE CHIMPANZEES
Friends of Washoe, Fall 1999, Volume 20, Number 4.
ABSTRACT: The present study incorporated noninvasive sampling
techniques to examine baseline hormone levels and behavioral
correlates in a small group of socially housed chimpanzees (Pan
troglodytes). Fecal sample and behavioral data were collected
seven days a week for six weeks. Hormones were extracted and
techniques validated for each sex. A radioimmunoassay (RIA)
procedure was used to measure testosterone and Corticosterone
in fecal sample extracts. High performance liquid chromatography
(HPLC) was used to characterize immunoreactive fecal testosterone
metabolites. Specific behavioral measures included female sex
skin swelling phase, male body odor, behavioral context, and
arousal level.
Parallelism between hormone standards and chimpanzee fecal
extracts was demonstrated for both hormones. Quantitative recovery
of unlabeled steroids confirmed the absence of interfering substances
in fecal extracts. There were no differences (p>0.05) between
males and females in absolute hormone concentrations. RIA of
fecal extracts after HPLC revealed that the testosterone antiserum
employed did not crossreact with other androgen metabolites
in chimpanzee feces. In general, corticosterone and testosterone
excretion was relatively steady despite several high arousal
interactions. In one instance, testosterone concentrations increased
in the dominant female two days after a stressful event.
These data revealed that fecal testosterone and corticosterone
metablites can be readily documented in chimpanzee feces, but
further work is needed to determine the physiological validity
of these methods. However, this approach has potential for improving
our understanding of the interrelationships between hormones
and social behaviors in chimpanzees.
March 1999 – Joe Anna Hood
SOCIAL REFERENCING IN ADULT CHIMPANZEES (Pan troglodytes)
Friends of Washoe, Spring 1999, Volume 20, Number 2.
May 1998 - Michelle Ann Haislip
ROLE OF PRESENCE OR ABSENCE OF HUMAN EYE GAZE IN THE
INITIATION OF COMMUNICATIVE INTERACTIONS INVOLVING JOINT ATTENTION
IN CHIMPANZEES
Friends of Washoe, Winter 1999, Volume 20, Number 1.
March 1997 - Katherine Cadish Hall
THE USE OF THE SIGNS OF ASL IN THE PRODUCTION OF ADDITIVE-CONJUNCTIVE
GROUPINGS OF COLORED EXEMPLARS BY A CHIMPANZEE (Pan troglodytes)
Central Washington University - Library
July 1996 - Shannon Nicole Cianelli
CHIMPANZEE TO CHIMPANZEE AMERICAN SIGN LANGUAGE COMMUNICATION
DURING HIGH AROUSAL INTERACTIONS
Friends of Washoe, Winter/Spring 1997, Volume 18, Number 1&2.
May 1996 - Mark A. Krause
REFERENTIAL POINTING IN CHIMPANZEES (Pan troglodytes)
Friends of Washoe, Summer/Fall 1996, Volume 17, Number 3&4.
November 1995 - Kimberly L. Williams
COMPREHENSIVE NIGHTTIME ACTIVITY BUDGETS OF CAPTIVE
CHIMPANZEES (Pan troglodytes)
Friends of Washoe, Winter/Spring 1996, Volume 17, Number 1&2.
May 1995 - Julia Quentin Davis
THE PERCEPTION OF DISTORTIONS IN THE SIGNS OF AMERICAN
SIGN LANGUAGE BY A GROUP OF CROSS-FOSTERED CHIMPANZEES (Pan
troglodytes)
Friends of Washoe, Winter/Spring 1995, Volume 16, Numbers 1
& 2.
May 1995 - Jennifer Ann Beaucher
CATEGORIZATION MODELS USED BY CHIMPANZEES WHEN FORMING
BASIC LEVEL CATEGORIES
Friends of Washoe, Summer/Fall 1995, Volume 16, Numbers 3 &
4.
July 1994 - Danielle Laurie Simpson
RESPONSES OF CHIMPANZEES TO SIGNED INTERROGATIVE AND
DECLARATIVE UTTERANCES
Central Washington University -Library
May 1994 - Mary Katherine Radeke
IMITATION OF NONSENSE AND FAMILIAR SIGNS BY FIVE CHIMPANZEES
(Pan troglodytes)
Friends of Washoe, Summer/Fall 1994, Volume 15, Numbers 3 &
4.
January 1993 - Vicki Marie Kennerud
THE EFFECT OF SOCIAL CONTEXT ON THE USE OF AMERICAN
SIGN LANGUAGE BY FIVE CHIMPANZEES (Pan troglodytes)
Friends of Washoe, Summer/Fall 1991, Volumes 11 & 12, Number
3.
October 1992 - Abeer Abden Nabi
VIDEOTAPES AS ENRICHMENT FOR A SOCIALLY—HOUSED
GROUP OF CHIMPANZEES
Friends of Washoe, Winter 1993, Volume 14, Number 2.
November 1990 - Elizabeth Lea Raymond
AN EXAMINATION OF PRIVATE SIGNING IN DEAF CHILDREN IN
A NATURALISTIC ENVIRONMENT
Friends of Washoe, Fall/Winter 1990-1991, Volume 10, Numbers
1 & 2.
June 1990 - Sheila M. Steiner
HANDEDNESS IN CHIMPANZEES
Friends of Washoe, Summer 1990, Volume 9, Number 4.
August 1989 - Heidi Lynne Shaw
COMPREHENSION OF THE SPOKEN WORD AND ASL TRANSLATION
BY CHIMPANZEES (Pan troglodytes)
Friends of Washoe, Fall/Winter 1989-1990, Volume 9, Numbers
1 & 2.
July 1989 - Mary Lee Abshire
IMAGINARY PLAY IN CHIMPANZEES
Friends of Washoe, Summer 1989, Volume 9, Number 4.
June 1987- Mark Douglas Bodamer
CHIMPANZEES SIGNING TO THEMSELVES
Friends of Washoe, Spring 1990, Volume 9, Number 3.
August 1985 – Katrina Patricia Mendis
A COMPARATIVE STUDY EXAMINING THE MODULATORY USAGE OF
SIGNING CHIMPANZEES
Central Washington University – Library
July 1985 - Kelly O’Donoghue
THE USE OF SIGN LANGUAGE DURING PLAY INTERACTIONS IN
A GROUP OF JUVENILE AND ADULT CHIMPANZEES
Central Washington University – Library
June 1983 - Donna Jean Schoenfeld
CEREBRAL SPECIALIZATION FOR THE PERCEPTION OF MOVING
ASL SIGNS
Central Washington University – Library
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