Vision: Perceptual Organization, Object Perception, and Face Perception

This flashcard set covers key terminology and concepts from the lecture on vision, including perceptual organization, object perception, and face perception.

Perceptual Organization

The process by which we make sense of complex images by segmenting and grouping elements.

Segmentation

The process of determining which parts of a visual scene are the figure and which are the background.

Grouping

The process of integrating information across different patches of a scene to determine which parts belong together.

Gestalt Cues

Principles used by the visual system to organize elements in a scene.

Proximity

A Gestalt cue stating that elements that are close to each other are grouped together.

Similarity (in Gestalt principles)

Elements that are similar in color, shape, or size are perceived to be part of the same group.

Law of Good Figure (Pragnance)

The visual system prefers the simplest and most stable interpretations of complex stimuli.

Invariance Problem

The challenge of recognizing an object despite changes in its appearance due to view, lighting, or occlusion.

Geons

Elementary shapes used in the Structural Description Model of object recognition, serving as building blocks for complex objects.

Visual Agnosia

A condition where people cannot recognize objects despite normal vision.

Aperceptive Visual Agnosia

A type of visual agnosia where individuals cannot perceive the form or structure of objects.

Associative Visual Agnosia

A type where individuals can perceive objects but cannot associate them with their meanings.

Face Perception

The process of recognizing and interpreting facial features, which may differ from general object perception.

Prosopagnosia

The inability to recognize faces despite having normal vision and intelligence.

Holistic Processing

The tendency to perceive faces as whole units rather than as a collection of individual features.

Face Selective Regions

Specific areas in the visual cortex that respond preferentially to faces.

Composite Effect

A phenomenon demonstrating that features of a face interact with each other, affecting perception.

Visual Cortex

The part of the brain responsible for processing visual information, including object and face perception.

Functional MRI

A technique used to measure and map brain activity by detecting changes associated with blood flow.

Object Recognition

The cognitive process of identifying and categorizing objects in the visual field.

Behavioral Testing in Prosopagnosia

Experiments designed to assess the ability of individuals with prosopagnosia to recognize faces versus objects.