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– SOURCE FACTORS IN PERSUASION
Chapter objectives
This chapter explores charisma and other factors of communication sources. It discusses aspects
of authority in great detail with a focus on Milgram’s classic study of obedience and the 2009
replication study. The concept of credibility is included covering contextual effects, and the role
that audience perceptions play in credibility judgments. Other source factors are discussed, such
as liking, similarity, and physical attractiveness effects.
Terms and issues to know
Authority
Authority effects in real life
Charisma
Compliance
Identification
Internalization
Knowledge bias
Liking
Milgram experiments
Nonverbal behaviors
Physical attractiveness
Chapter outline
I. Charisma
A. is set
apart from ordinary men and treated as endowed with supernatural, superhuman, or at
B. The chemistry between speaker and audience is a product of a particular set of
circumstances, psychological needs, and social conditions
II. Understanding the Communicator
A. Not one defining characteristic of effective communicators
B. Three fundamental communicator characteristics
2. Credibility
3. Social attractiveness
C. Credible communicators influence attitudes through internalization
III. Authority
A. Influence others through compliance
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C. Experimental Procedures and Results
1. Milgram experiment
a. One of the many studies of effects of authority on behavior
2.
inflict harm on a protesting victim
3. Explanations:
a. Explanation must lie in the power that situations can exert on human behavior
i. Early socialization
ii. Trappings of authority
iii. Binding forces
b.
D. Revisiting Milgram: 2009 Replication Article
1. In January 2009, the Journal of the American Psychological Association published a
major article by Jerry M. Burger on his replication of the Milgram experiment
3.
E. Additional Issues:
2. Authorities lose grip if enough people resist
3. Ethical critique has stimulated much discussion
F. Applications – there is always a way to respect conscience and resist exploitive
authorities in some way, shape, or form. Examples:
2. Holocaust of the Jews
IV. Credibility
A. Influences attitudes through internalization
B. Recommendations from credible communicators are congruent with our values and
attitudes
C. Dates back to Aristotle, who coined the term ethos to describe qualities of the source that
E. Credibility is a psychological or interpersonal communication construct
F. Credibility is defined as the attitude toward a source of communication held at a given
time by a receiver
G. Core Characteristics
1. Credibility has more than one dimension/more than a single layer
2. The most important characteristics are:
a. Expertise
i. Knowledge or ability ascribed
ii. Belief that the communicator has special skills or know-how
b. Trustworthiness – refers to the communicator s perceived honesty, character, and
safety
c. Goodwill
i. Perceived caring
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iv. s problems
v. An element of charisma
H. Role of Context
2. Critical situational factors include:
I. A Theoretical Account
1. Individuals make predictions or develop expectations
2. Knowledge bias:
a. If a speaker confirmed your prediction, you might conclude that they possessed a
knowledge bias
b. A knowledge bias is the presumption that a communicator has a biased view of
an issue
c. An audience member concludes that the communicator has a limited base of
knowledge, produced by a need to view an issue in accordance with the
3. Reporting bias
a. Taking a position merely to make a point
b. They assume that the speech reflects a situational pressure to say the socially
correct thing
J. Social Attractiveness
2. People go along with attractive speakers because they identify with them
3. Likability
a. Likable communicators can change attitudes
i. A likable person makes you feel good
4. Similarity
a. Similarity between source and receiver can facilitate persuasion in business, on
social issues, and for health problems
b. Similarity works for some of the same reasons likability succeeds, it induces
5. Physical Attractiveness
a. Attractiveness does change attitudes
b. People are more likely to pay attention to attractive people
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i. Attractiveness can help form attitudes
ii. Attractiveness can be effective when the communicator s goal is to
V. Conclusions
A. Charismatic speakers have seemed to magnetize audiences, influencing attitudes in
benevolent and malevolent ways
B. Three core communicator qualities: authority, credibility, and social attractiveness
C. Milgram study of obedience, demonstrated we can influence behaviors through a process
of compliance
Discussion questions
1. Compare and contrast the classic Milgram experiments with the January 2009 replication
study done by Jerry M. Burger. If you were going to do a replication study what would you
have done the same or differently?
2. Credible communicators are perceived as having expertise, trustworthiness, goodwill,
in.
3. Candidate credibility plays a prominent role in presidential campaigns. The text suggests
that a particular type of credibility communication will have different impacts due to