Visual Representation and Perception — Key Concepts (Notes)

Core Concepts in Visual Representation and Perception

Basic shapes act as building blocks; convey both intellectual meanings and emotional responses.
Symbol dictionary: shapes/images function like words with denotative meaning plus emotional impact.
Perspective and emotion: combines emotional and logical interpretation; 3‑D space is perceived via learned cultural cues.
Informal learning: people learn to read perspective through cultural interactions (e.g., adults naming objects in images).
Physical and cognitive processing: eye structure and cognition shape understanding; graphics can be reduced to basic shapes for easier cognition.

Schemata and Information Organization

Schemata: organizational patterns that govern information use and represent object/scene structure.
Drawing instruction: basic geometric forms used in how‑to drawing books to teach amateur artists.
Schematic drawing systems: provide information prioritizing essential features (e.g., subway maps).
Perspective vs schematic: perspective conveys depth via angles/warps/color; schemata are simpler organizational templates.
Linear Perspective Development: historical context in the Renaissance; Brunelleschi invented linear perspective around $1413$ to better represent space.

Cultural Recognition and Primeval Art

Western rule: larger images appear closer; not universal across cultures.
Kenyan perspective: some communities may not recognize linear perspective in photographs.
Primeval art: lacks rectangular orientation; imagery often layered rather than arranged in Western naturalism.
Egyptian art: does not use linear perspective; size communicates status/importance symbolically.
Cultural interpretation: visual representations are culturally contingent and influence perceived realism.

Monocular vs. Binocular Vision

Monocular cues: depth information from a single eye in 2‑D viewing.
Binocular vision: additional depth cues from using both eyes.
Stereoscopic development: early stereoscopes by Wheatstone and Brewster in the $1800$ s; depth through slightly different views.
Virtual Reality origins: stereoscopic techniques contributed to early VR concepts.

Mediated Images and Emotional Responses

Mediated visuals: designed to elicit physiological and psychological responses (e.g., advertising).
Cognitive processing: interpretation of visual data blends with emotion and context.
Persuasiveness: merging visual/sensory elements enhances impact of mediated images, especially in marketing.

Computer Graphics, Perspective, and Historical Links

Digital visual systems: computer science enables new digital perspective systems.
CAD/CAM: expand use of linear perspective, enabling manipulation/rendering in multiple dimensions.
Historical linking: new images reference past technologies, aiding understanding of visual systems.

Virtual Reality Technologies

Nonimmersive VR: information visible on screens; interacts with real-world objects; relies on linear perspective.
Immersive VR: surrounds user with computer-generated environments; uses stereoscopic imaging for 3‑D experiences.
User interaction: immersive VR enables hand–eye coordination.

Cultural Perspectives on Art

Cultural variability: different cultures have distinct visual communication systems for space/depth.
Western vs non‑Western art: Western art often uses linear perspective; non‑Western traditions may use atmospheric/alternative depth cues.
Chinese art techniques: vertical placement and atmospheric perspective; diverges from Western linear methods.

Technological Influences on Perspective

Camera obscura: in the 17th–18th centuries enabled fixed-position representations, shaping visual thinking.
19th‑century shifts: railroads and photography changed the observer’s relationship to the environment; emphasis on visual experience.

Dissociation of Senses and Artistic Shifts

Travel speeds and technology separated touch from sight, altering perception and interaction with the world.
Artistic movements and perspective changes:
- Cubism: multiple viewpoints; fragmentation of space.
- Impressionism: focus on psychological perception rather than strict realism.
- Cultural reflection: art movements mirror cultural beliefs and values that shape perception.

Visual Perception and Interpretation

Active process: vision involves eye movements and cognitive processing.
Saccadic movements: rapid eye shifts between fixations; occur roughly $2$ to $4$ times per second.
Cultural influence: interpretation of images is shaped by cultural background.

Conclusion

Cultural and technological interplay: perspective and visual systems evolve with culture and tech.
Learning to read visuals: essential across cultures and historical contexts for accurate interpretation.

Summary of Key Concepts in Visual Representation and Perception

I. Object Representation Techniques

Photographic exercise: photograph objects from multiple angles to capture all sides.
Image reconstruction: cut photos into pieces and reassemble into a single multi‑perspective image.
Alternative method: use drawings cut apart and recombined to represent different perspectives.

II. Key Visual Perception Terms

A. Eye‑Related Concepts

Binocular vision: depth perception from both eyes.
Monocular vision: depth perception from a single eye.
Saccadic eye movements: rapid jumps between fixation points; ~ $2$ to $4$ times per second.

B. Perspective Techniques

Linear perspective: lines converge at a single point to create depth.
Reversed perspective: background figures larger than foreground to imply depth.
Foreshortening: object appears shorter as it turns away from the viewer.
Texture gradient: texture becomes finer with distance.

III. Virtual Reality Concepts

A. Types of Virtual Reality

Immersive VR: full environment around the user via headsets; stereoscopic view.
Nonimmersive VR: information viewed on a screen; interaction with real objects.

B. Applications in Art and Design

IV. Visual Processing Mechanisms

A. Attention and Perception

Selective attention: focus on specific stimuli while filtering others.
Schemata: mental templates guiding interpretation.

B. Visual Cues and Depth Perception

Occluded objects: depth cues from partial visibility.
Vanishing point: horizon point where parallel lines appear to converge, aiding depth construction.

V. Summary of Techniques and Concepts

Visual representation methods (photography, drawing) capture and reconstruct visual aspects.
Mastery of perspective enhances realism and viewer engagement.
VR applications offer new ways to experience visual content.
Understanding cognitive processing (attention, schemata, cues) is essential for interpreting visual information effectively.

Quick Reference Note from VC Ch 3 Video Lecture

Schema concept: a word triggers a network of past experiences and shared associations (e.g., the word "beach" evokes multiple ideas).
Example discussion connects reading visuals to everyday experiences and cultural context.

Visual Arts Historical Context (Brief)

Early 20th-century developments in Cubism and related movements challenged traditional perspective.
Photography and modern media influenced how artists represented space and reality.
Contemporary practice increasingly blends traditional perspective with new technologies (e.g., augmented reality).

Outsider Art

Artists working outside mainstream contexts offer unique perspectives and techniques that broaden visual interpretation.

Additional Notes on Techniques

Textural and compositional experiments, atmospheric perspective, and vertical placement contribute to depth without strict linear perspective.
Dragonflies have up to $30000$ ommatidia per eye, illustrating biological depth cues that differ from human vision.
The human visual system involves up to $50$ proteins contributing to vision.
Brunelleschi’s discovery around $1413$ established the mathematical basis for linear perspective in art.
19th‑century technologies (e.g., railroads, photography) shifted observation from tactile to visual experiences.