Lecture 7: Elaboration Likelihood Model

Elaboration Likelihood Theory

• A dual-process theory of persuasion developed by Petty and Cacioppo in the 1980s that explains how people process information and change attitudes

• This explains how people change their attitudes when they receive persuasive messages and why some messages influence people more deeply than others.

• They wanted to understand why some messages change attitudes in a lasting way, while others only create short-term changes.

Six Phases of Research Development

1. Exploring the elaboration continuum

2. Central and peripheral routes to persuasion

3. Elaboration affects attitude strength

4. Multiple roles of persuasion variables

5. Extending beyond the persuasion context

6. A new role for variables—self-validation

Significance of the MModel

• ELM was developed to address a critical “gap” in the persuasion literature of the 1970s

  • The significance of the model lies in its ability to provide a unifying framework that explains how the same variable can produce difference results depending on the situation.

The Research Gap (The Problem the ELM Solved)

• Theoretical collapse (1970s)

• “Mystifying Diversity” of results

• The attitude-behavior gap

• The need for a metatheory

Four Core Ideas of ELM

• The model says that people process persuasive messages in two main ways:

  • Central Route

  • Peripheral Route

• ELM explains how persuasion can influence people’s attitudes and judgements

• The model has been presented schematically and through formal propositions in academic research

• When simplified, the ELM focuses on four essential ideas that explain how persuasion works

• These ideas describe how people process persuasive messages and how attitudes are formed or changed.

Summary:

The Elaboration Likelihood Model (ELM) explains how people are persuaded through two main routes: the central route and the peripheral route. The central route involves deep and careful thinking, where the audience evaluates arguments, evidence, and logic. This usually happens when people have high motivation and ability, such as when the topic is personally relevant or easy to understand. As a result, attitudes formed through this route are strong, long-lasting, and resistant to change. On the other hand, the peripheral route involves surface-level thinking, where people rely on cues like emotions, attractiveness, or credibility instead of analyzing the message. This happens when motivation or ability is low, and the resulting attitudes are temporary and easily changed. The model also introduces the elaboration continuum, which shows that people can process messages at different levels of thinking, not just two extremes. In public speaking, ELM is useful because it helps speakers analyze their audience and use both routes effectively—combining strong arguments with engaging visuals or emotional appeal to maximize persuasion.

1. Big Picture: What is ELM?

The Elaboration Likelihood Model explains how people are persuaded and why some messages affect us more deeply than others.

The key idea is simple:

Sometimes we think deeply, sometimes we don’t. That difference is what ELM is all about.

2. The Core Idea: Two Ways We Process Messages

ELM says there are two routes to persuasion:

A. Central Route (Deep Thinking)

This happens when:

• You care about the topic

• You have the ability to understand it

You will:

• Analyze arguments carefully

• Ask questions

• Evaluate evidence

Example (from your slides):

Result:

• Strong opinions

• Long-lasting attitude change

• Hard to change later

B. Peripheral Route (Surface-Level Thinking)

This happens when:

• You don’t care much

• You’re distracted or uninterested

You rely on:

• Celebrities

• Emotions

• Design, humor, freebies

Example:

Result:

• Weak opinions

• Easily changed

• Temporary persuasion

3. The Elaboration Continuum (VERY IMPORTANT)

Instead of just “thinking vs not thinking,” ELM says:

So:

• Low thinking → Peripheral route

• High thinking → Central route

You’re always somewhere in between depending on the situation.

4. What Determines Which Route You Use?

This is one of the most important parts for exams:

Two main factors:

1. Motivation

Do you want to think?

Depends on:

• Personal relevance

• Interest

• Need for thinking

Example:

• If the topic affects your grades → HIGH motivation

• If it’s random → LOW motivation

2. Ability

Can you actually think about it?

Depends on:

• Knowledge

• Clarity of message

• Distractions

Example:

• Complicated speech + no background → LOW ability

Key Rule:

5. Why Thinking Level Matters

This is where many students get confused, so focus here:

• High thinking (central) → strong, lasting beliefs

• Low thinking (peripheral) → weak, temporary beliefs

So:

Some messages stick. Some don’t.

6. Role of “Variables” (Influences)

Things like:

• Attractiveness

• Mood

• Speaker credibility

These can:

• Act as shortcuts (peripheral)

• Or be analyzed deeply (central)

Example:

• “She’s attractive, so I trust her” → peripheral

• “Her credentials are strong” → central

7. Application to Public Speaking (VERY IMPORTANT)

This is where everything becomes practical.

As a speaker, you should:

1. Analyze your audience

• Are they interested? (motivation)

• Can they understand? (ability)

2. Use BOTH routes

Your slides emphasize this:

• Central route → strong arguments, facts, logic

• Peripheral route → visuals, emotions, relatable examples

Best speeches combine both.

3. Make your message easy to process

• Clear structure

• Simple language

• Engaging visuals

8. Simple Way to Remember ELM

If you need a quick explanation:

9. One Real-Life Example

Imagine a speech about exercise:

• Central route:
  “Studies show 30 minutes of exercise improves memory and focus.”

• Peripheral route:
  Fit influencer + aesthetic visuals + catchy slogans

Best persuasion = both combined