Communication Theory and Rhetoric: Core Concepts

Posted on May 19, 2026 in Communication

Unit 1: Communication

The word communication derives from the Latin communicare, meaning to share, exchange, or put in common. It is linked to the concept of community. Originally defined as the passing of ideas, information, and attitudes, the term has expanded to include physical channels and modern technological inventions. With over 126 definitions across disciplines like psychology and sociology, scholars like Dance, Littlejohn, and Foss suggest viewing it as a “family of concepts.”

Characteristics of the Information Society (Yoneji Masuda)

  • Heterogeneity: Identities and opinions multiply.
  • Exuberance: Massive data circulation.
  • Irradiation: Dissemination of messages without physical distance.
  • Speed: Immediate communication via the internet.
  • Disorientation: Difficulty distinguishing truth.
  • Omnipresence: ICTs facilitate constant social interaction.
  • Multilaterality: Information originates from diverse sites.
  • Inequality: Digital divide between industrialized and poor regions.
  • Interactivity vs. Passivity: Most users remain passive consumers.

Criteria for a Good Theory

A theory is a “net” to catch and rationalize the world (Karl Popper). Criteria include:

  • Theoretical scope: Applicable to many interactions.
  • Appropriateness: Postulates must relate to the phenomenon.
  • Heuristic value: Ability to generate future research.
  • Validity: Can be proven true or false.
  • Parsimony: The simplest possible explanation.
  • Openness: Compatible with other theories.

Key Concepts

  • Communicative Competence (Canale): Includes linguistic, sociolinguistic, discourse, and strategic competencies.
  • Symbols vs. Signs: Symbols are arbitrary; signs are direct and utilitarian.
  • Encoding/Decoding: The process of formulating and interpreting messages.
  • Redundancy: Mechanisms to ensure accurate decoding.
  • Noise: Interference in the process.

Unit 2: Rhetoric

Derived from the Greek rhetorike techne, rhetoric is the “art of the speaker.” It is a system of rules to build a persuasive message. Aristotle defined it as identifying the available means of persuasion in any situation.

Quintilian’s Rules for Good Rhetoric

  • Aptum (Adequacy): Everything must fit the audience.
  • Puritas (Correctness): Proper grammar and language.
  • Perspicuitas (Clarity): Easy to follow.
  • Ornatus (Style): Using beauty to engage the audience.

The Canon of Rhetoric

  1. Invention: Searching for arguments (Ethos, Logos, Pathos).
  2. Arrangement: Structuring the speech (Exordium, Narration, Division, Proof, Refutation, Peroration).
  3. Style: Choosing the right tone (High, Middle, or Low).
  4. Memory: Using images and practice.
  5. Delivery: Staging, voice, and body language.

Unit 2.1: Non-Verbal Communication

According to the Mehrabian Rule, only 7% of a message’s impact is verbal; 38% is vocal, and 55% is non-verbal. Key areas include:

  • Paralinguistics: Tone, rhythm, and volume.
  • Kinesics: Gestures and posture.
  • Proxemics: Personal space.
  • Chronemics: Organization of time.
  • Diacritical Behavior: Identity markers like clothing.

Unit 3: Mass Communication

Marshall McLuhan famously stated, “The medium is the message,” arguing that the channel shapes human experience more than the content. Key theories include:

  • Structural Approach: Focuses on media systems and power.
  • Behavioral Approach: Studies individual responses to media.
  • Cultural Approach: Focuses on meaning-making and language.

Unit 4: Media Effects

The study of media effects has evolved through several paradigms:

  • Magic Bullet/Hypodermic Needle: Suggests media has a direct, powerful impact.
  • Two-Step Flow Theory: Information flows from media to opinion leaders, then to the public.
  • Cultivation Theory (Gerbner): Long-term exposure to TV standardizes cultural norms.
  • Spiral of Silence: Individuals remain silent if they perceive their opinion is in the minority.

Unit 5: Persuasion

Persuasion is the intentional act of social influence. The Yale Model (Hovland) identifies four stages for a successful message: Attention, Comprehension, Acceptance, and Retention. Attitudes consist of three components: Cognitive (beliefs), Affective (feelings), and Conative (intentions to act).