Paths to Persuasion: The Central and Peripheral Routes of the ELM

UPI Study › Courses › Advanced Social Psychology › Free lessons › Lesson 2.5 Free with a free account

Paths to Persuasion: The Central and Peripheral Routes of the ELM

Advanced Social Psychology · Chapter 2: Attitudes and BehaviorSection 2.5 · lesson 11 of 8511 min · free with a free account

← Hidden vs. Visible Attitudes: Implicit and Explicit EvaluationNext lesson: Emotion as a Catalyst: How Feelings Shape Attitudes and Drive Persuasion →

Earn 3 college credits for Advanced Social PsychologyRecommended for credit by NCCRS · Psychology 310 · self-paced · one payment, lifetime access
Enroll in Advanced Social Psychology · $250 →Download the syllabus (PDF)

In this lesson

Two routes through a message, and why the route decides how long the change lasts.

  • Explain the central and peripheral routes
  • Describe how motivation and ability set the route
  • Compare the two routes on persistence and resistance
  • Apply the multiple-roles postulate

Free study notes

Get this lesson's notes by email

The key points and 4 practice questions with answers, in your inbox. One email, free.

One email. Unsubscribe in one click.

Transcript

Everything said in the video, section by section (1,478 words). Read along, or search it.

Attitudes and Behavior

Paths to Persuasion

Why does the same message change one person for years and another for an afternoon? Why do some attitudes survive being argued with, while others fold immediately? And why does a celebrity selling an unrelated product actually work? Those three questions have one answer, and it is not about the message. It is about how the recipient processed it. This section covers the Elaboration Likelihood Model. Two routes through a persuasive message, chosen by the listener rather than the speaker. The two routes can produce identical shifts on the day. What they do not produce is identical attitudes a month later.

The Puzzle

Three Questions That Would Not Resolve

Persuasion research was fragmented for decades before this model arrived. Findings contradicted each other, and nobody could say why. Petty and Cacioppo proposed the Elaboration Likelihood Model in nineteen eighty-six. It has since become the most widely cited theory of persuasion in the field. Its central claim is simple to state. Any persuasive message is processed along one of two routes. Or, more precisely, along some weighted mixture of the two. The central route involves effortful scrutiny of the message's arguments. The peripheral route relies on simple cues instead. Source attractiveness, message length, mood, the mere presence of statistics. Those cues operate as proxies for merit, standing in for an evaluation nobody made. Which route dominates depends jointly on motivation and ability.

The Key Term

Elaboration, in the Technical Sense

Elaboration has a technical meaning here, and it is worth getting exactly right. It is the extent to which a recipient generates issue-relevant thoughts. Notice that this is a property of the listener's activity, not of the message. High elaboration means careful evaluation of the arguments. Evaluation against the recipient's existing knowledge and beliefs. Low elaboration means surface processing. It relies on whatever cues happen to be immediately available. Elaboration likelihood is governed by two factors, and both are questions. Motivation asks: do I want to think carefully about this? Ability asks: am I able to do so right now? Both must be at least moderately high for the central route to dominate. If either one is low, processing shifts toward the peripheral route. That is an and, not an or, and it is the most commonly dropped detail.

The Architecture

How a Message Finds Its Route

Here is the architecture, as a sequence. A persuasive message arrives at a recipient. It then meets two gates: motivation to process, and ability to process. Both gates have to open for the central route. If both are high, elaboration is high and the central route dominates. If either is low, processing slides toward the peripheral route. In practice it is usually a mixture rather than a clean switch. And the route taken determines more than the immediate evaluation. It determines the persistence of the resulting attitude. Its resistance to counter-argument, and its capacity to predict behavior.

Route 1

The Central Route: Argument Quality Decides

Take the central route first, where elaboration is high. Attitude change there is driven primarily by argument quality. Strong arguments are evidence-based, internally consistent, and hard to counter. They produce favorable cognitive responses that consolidate into durable change. But high elaboration carries a risk that low elaboration does not. Weak arguments elicit counter-arguments. And they may produce boomerang effects, where the recipient ends up more opposed. More opposed than they were before you spoke to them. So under high elaboration, a bad argument is worse than no argument at all. The classic demonstration is Petty, Cacioppo and Goldman, in nineteen eighty-one. They manipulated argument quality and source expertise in the same study. Then they varied personal relevance. When the topic was personally relevant, only argument quality mattered. When it was irrelevant, only source expertise mattered. The same variables, functioning completely differently depending on elaboration.

Route 2

The Peripheral Route: Cues Stand In for Merit

Now the peripheral route, which is where most persuasion actually happens. Under low elaboration, recipients lack the motivation or the ability to evaluate arguments. So they turn to cues instead. The credibility, attractiveness, or likeability of the source. The sheer number of arguments offered, rather than what any of them say. The apparent expertise signaled by jargon and citations. And the recipient's own mood at the time. Chaiken, in nineteen eighty, called these heuristics. Simple rules, like experts are usually right. Or more arguments mean a stronger case. Now, an important correction to a common misreading. Peripheral-route attitude change is genuine. Survey the recipient immediately afterward and they report a real shift. The difference lies entirely in what that attitude does afterward.

Research Spotlight

Need for Cognition

One individual difference predicts route better than almost anything else. Some people enjoy effortful thinking. Others avoid it where they can. The Need for Cognition scale, from Cacioppo and Petty in nineteen eighty-two, captures it. High scorers elaborate persuasive messages by default. They are influenced primarily by argument quality. And that holds even on topics of low personal relevance to them. Low scorers rely on peripheral cues, unless personal relevance is high. So the trait is a stable moderator of which route dominates. It is also a practical target for audience segmentation. In health communication and in education research, particularly. Because the same campaign lands on both groups at once. Segment by need for cognition and you stop writing one message for two jobs.

What Moves The Gates

Moderators of Elaboration

What moves the two gates? Take motivation first. It is heightened by personal relevance, and by accountability. By multiple sources arguing the same position. And by the recipient's stable need for cognition. It is suppressed by fatigue, by low issue involvement. And by the perceived irrelevance of the topic to one's own outcomes. Ability is a different list. It depends on prior knowledge of the topic, and on the absence of distraction. On available time, and on how accessible the relevant concepts are. Distraction, time pressure, message complexity and language fluency all bear on it. Notice a practical asymmetry between the two lists. Motivation is usually easier to raise than ability. Framing a topic as personally consequential costs you one sentence. Supplying prior knowledge costs you a curriculum.

The Subtle Part

The Multiple-Roles Postulate

Now the subtlest part of the model, and the part summaries usually drop. It is called the multiple-roles postulate. Any given variable can influence persuasion through several mechanisms. Which mechanism operates depends on the conditions. Take source expertise. Under low elaboration it is a peripheral cue. Under high elaboration it becomes evidence for the validity of an argument. And it can also determine how confidently the post-message attitude is held. One variable, three distinct roles. Mood behaves the same way. It may act as a peripheral cue. It may bias which thoughts get elaborated under high motivation. Or it may alter perceived argument strength through mood-congruent inference. This postulate explains a real problem in the literature. Claims of the form, variable X increases persuasion, rarely replicate across conditions. Which is why interaction effects, not main effects, are the proper test here.

The Sibling Theory

The ELM and the Heuristic-Systematic Model

The ELM has a sibling theory, and you should know how they relate. Chaiken's Heuristic-Systematic Model is the principal competitor. In practice it functions more as a complement. Both posit a deliberate route and an automatic one. And both share most of the same moderators. The Heuristic-Systematic Model differs in two respects. First, it identifies the peripheral route specifically with named heuristics. Not with cues in general, but with particular rules of thumb. Second, it allows both routes to operate simultaneously. A sufficiency principle then determines how much systematic processing gets added. Added, that is, on top of the heuristic processing already happening. Most contemporary treatments file the two as friendly variants. Variants of one common dual-process architecture, rather than rivals.

The Payoff

Same Shift Today. Different Attitude Tomorrow.

Now the model's most empirically supported claim. It concerns the quality of the attitude change, not its size. Central-route changes persist longer over time. They resist counter-persuasion more effectively. And they predict behavior more reliably. The reason lies in the cognitive structure that gets built. Central-route processing creates a rich associative network. Arguments were evaluated. Counter-arguments were rejected. Links were formed to existing knowledge. That gives the resulting attitude multiple anchors in memory. A peripheral shift, by contrast, rests on a single cue. When that cue fades, or is contradicted, the shift simply collapses. The required conditions differ too, and asymmetrically. The central route needs both motivation and ability. The peripheral route is triggered by a deficit in either one.

Consolidate

Matching the Message to the Audience

The applications are extensive, and they follow directly from the model. In health communication, match message complexity to elaboration likelihood. Detailed, evidence-rich messages for motivated, educated audiences. Vivid, source-anchored framing for the less involved. In advertising, the product category tells you which strategy to use. Low-involvement categories like chewing gum reward peripheral strategies. High-involvement categories like insurance reward central ones. In political communication, the model explains a familiar contrast. Deliberative voters scrutinize policy positions carefully. Casual voters treat source identity as a peripheral cue. Here is the single sentence worth carrying forward. The route matters even when the immediate shift in reported attitude is identical. Persuasion that has to last is earned through elaboration, not bought with a cue.

About Advanced Social Psychology at UPI Study

Advanced Social Psychology (Psychology 310) is a self-paced online course of 85 video lessons in 12 chapters, from attitudes, persuasion and the self to prejudice, attraction and relationships, conformity and obedience, helping, aggression and social life online. It carries a NCCRS credit recommendation for 3 semester credits.

Every lesson transcript is free on pages like this one, and the videos are free with a free UPI Study account. Enrolling adds a practice quiz after each lesson, the graded work and final exam that earn the credit, lifetime access, and an official transcript on completion. UPI Study has helped over 130,000 students with college credits. ACE and NCCRS have over 2,100 cooperating colleges that will consider accepting credits; the final decision is with the universities.

Enroll now → Course details Download the syllabus All Psychology and social science courses Every course with PRO →

Compare: Social Psychology vs Sociology

Why take it here

Why students take Advanced Social Psychology with UPI Study

How other people shape what we think and doAdvanced Social Psychology explains how people think about, influence and relate to one another: attitudes and persuasion, the self, prejudice and intergroup conflict, attraction and close relationships, conformity and obedience, helping and aggression. It is a common upper-level course in psychology and sociology degrees.
Credit at a fraction of the priceThe same 3 credits can cost $750 or more at a US college. Here it is one payment, self-paced, with lifetime access.
Finish your degree soonerTransfer credits reduce the courses you still owe, so you can graduate earlier or lighten a heavy semester.
Strengthen an applicationA completed college-level course on an official transcript shows admissions and scholarship committees you can do the work.
Study on your own scheduleNo start dates, no deadlines. Watch the lessons, practice, and take the final when you are ready.
130,000+students helped with college creditsACE and NCCRS have over 2,100 cooperating colleges that will consider accepting credits; the final decision is with the universities.

Where the credit goes

Universities that work with NCCRS

Advanced Social Psychology carries a NCCRS credit recommendation. These universities work with NCCRS; some are UPI Study's signed partners. ACE and NCCRS have over 2,100 cooperating colleges that will consider accepting credits; the final decision is with the universities.

Thomas Edison State UniversityThomas Edison State UniversitySigned partnerUniversity of the PeopleUniversity of the PeopleSigned partnerCharter Oak State CollegeCharter Oak State CollegeSigned partnerStrayer UniversityStrayer UniversitySigned partnerColumbia Southern UniversityColumbia Southern UniversitySigned partnerIndiana TechIndiana TechSigned partnerPenn StatePenn StateWorks with NCCRSSouthern New Hampshire UniversitySouthern New Hampshire UniversityWorks with NCCRSSUNYSUNYWorks with NCCRS +many more cooperating universitiesFind my college →

Find my college → Not listed? Ask Athena in the corner of this page, or book a 15-minute call.

FAQ

Questions students ask us

About Paths to Persuasion: The Central and Peripheral Routes of the ELM

What is the Elaboration Likelihood Model?
The Elaboration Likelihood Model, set out by Richard Petty and John Cacioppo in 1986, says persuasive messages are processed along a central route, involving careful scrutiny of arguments, or a peripheral route, relying on simple cues such as source attractiveness or the number of arguments. Which route dominates depends on the recipient's motivation and ability to think about the message. In practice, processing is usually a mixture of the two.
What is the difference between the central and peripheral routes to persuasion?
Central-route persuasion is driven by argument quality and produces attitudes that last longer, resist counterarguments, and predict behavior better. Peripheral-route persuasion is driven by cues such as source credibility, attractiveness, mood, or message length, and the resulting change is real but more fragile because it rests on a cue. The central route requires both motivation and ability, while a shortage of either pushes processing toward the peripheral route.
What did Petty, Cacioppo, and Goldman's 1981 study find?
Petty, Cacioppo, and Goldman found in 1981 that personal relevance determined what persuaded students about a proposed senior comprehensive exam. When the policy would affect them personally, argument quality mattered most. When it would not, the expertise of the source mattered most. The study showed that the same variables can work differently depending on how much people elaborate on a message, a central idea of the Elaboration Likelihood Model.
What is need for cognition in persuasion?
Need for cognition is a stable individual difference in how much people enjoy and engage in effortful thinking, measured by a scale John Cacioppo and Richard Petty published in 1982. People high in need for cognition tend to elaborate on messages and are swayed mainly by argument quality, even on topics of low personal relevance. People low in it rely more on peripheral cues unless the topic matters to them personally.

About the Advanced Social Psychology course

How many college credits is Advanced Social Psychology?
Advanced Social Psychology (Psychology 310) carries a NCCRS credit recommendation for 3 semester credits. ACE and NCCRS have over 2,100 cooperating colleges that will consider accepting credits; the final decision is with the universities.
How much does Advanced Social Psychology cost and what is included?
$250, paid once, with lifetime access: all 85 video lessons, a practice quiz after each, the graded work and final exam, and an official transcript when you finish. Students who want several courses choose UPI Study PRO instead.
Which universities accept UPI Study credits?
UPI Study has signed partner agreements with universities such as Thomas Edison State University, University of the People and Charter Oak State College, and works with universities such as Penn State, SNHU and SUNY. ACE and NCCRS have over 2,100 cooperating colleges that will consider accepting credits; the final decision is with the universities. Use "Find my college" on this page to check yours.
How long does Advanced Social Psychology take?
It is self-paced with no deadlines. The 85 lessons total about 15 hours of video; most students add reading and practice time and finish in a few weeks to a few months, on their own schedule.
How are the exams done?
Quizzes and assignments are online in the course. The final exam is taken online with proctoring; a person on the UPI Study team checks assignments, usually within two days.
How do my credits reach my college?
When the course shows 100% complete, request the official transcript from your dashboard. It is sent to the college you name, and you can send it to more than one. Check your college first with "Find my college" on this page, or ask Athena.

Ready for the full course? Earn 3 credits in Advanced Social Psychology.

85 video lessons, a quiz after each one, and the graded work that earns the credit. Recommended for credit by NCCRS.

Enroll in Advanced Social Psychology →Download the syllabusEvery course with PRO →
Advanced Social Psychology
3 credits · NCCRSEnroll →