Perception, Object Processing, and Attention Vocabulary

Vocabulary terms and definitions related to object processing, Gestalt principles, facial processing, and theories of visual attention based on the lecture transcript.

Inverse Projection Problem

The ambiguity where many different visual stimuli can produce the exact same pattern of neural firing on the retina.

Heuristics

Mental shortcuts or rules of thumb based on experience that guide human perception.

Light from Above

A fundamental heuristic based on the assumption that light generally comes from above, helping the brain interpret 3D shapes and shadows.

Schemas

Contextual knowledge based on specific environments that primes expectation and speeds up object recognition.

Gestalt Psychology

An approach to psychology built on the core idea that 'the whole is different than the sum of its parts' and that perception is guided by organizational relationships.

Apparent Motion

The perception of movement resulting from stationary objects presented sequentially at time $t_1$ and time $t_2$, studied by Wertheimer.

Transposability of Parts

The principle that specific parts of an object can be replaced as long as their spatial or functional relationships remain the same, preserving perception of the whole.

Pragnanz

Also known as the Simplicity or Minimum Principle; a Gestalt law stating that we default to perceiving the simplest possible organization of a visual array.

Law of Similarity

A Gestalt grouping principle stating that objects with similar visual characteristics are grouped together.

Law of Proximity

A Gestalt grouping principle stating that objects positioned close to one another are grouped together.

Law of Good Continuation

A Gestalt grouping principle stating that lines or patterns are perceived as continuing in the smoothest possible path, even when occluded.

Law of Closure

A Gestalt grouping principle stating that the mind perceives complete, closed figures even when parts are missing or implied.

Law of Common Fate

A Gestalt grouping principle stating that elements moving together in the same direction are perceived as a single group.

Shape Constancy

The visual system's perception of an object maintaining a stable shape despite variations in viewing angle.

Size Constancy

The perception that an object retains a consistent physical size regardless of changes in distance or retinal image size.

Lightness Constancy

The perception of an object's lightness or reflectance as stable despite changes in ambient illumination.

Ventral Stream

Also known as the 'What Pathway'; visual information processing that travels from the occipital lobe to the temporal lobe.

Inferior Temporal Cortex (IT)

A brain region where neurons respond to complex visual stimuli beyond simple lines and edges, such as specific shapes or feature combinations.

Fusiform Face Area (FFA)

A specialized region within the inferior temporal lobe that responds selectively to faces, illusory faces, and animal faces.

Prosopagnosia

A condition known as 'facial blindness' where individuals cannot recognize faces, often resulting from damage or underdevelopment of the FFA.

Grandmother Cell Theory

A theory proposing that a single specific neuron is dedicated to recognizing one specific face.

Distributed Coding Theory

The accepted view that face recognition results from a unique pattern of firing rates across a population or cluster of many neurons.

Stroop Effect

A phenomenon demonstrating task interference when an automatic process, such as reading words, conflicts with an effortful task, such as naming ink color.

Feature Integration Theory (FIT)

A theoretical model proposing that visual perception occurs in two distinct stages: the preattentive stage and the focused attention stage.

Preattentive Stage

The initial rapid and automatic stage of Feature Integration Theory where basic visual features like colors, lines, and motion are extracted independently.

Focused Attention Stage

The second stage of Feature Integration Theory requiring conscious effort to bind individual features together into a single, coherent object.

Inattentional Blindness

A phenomenon where an unattended stimulus in plain sight fails to be perceived by the viewer.

Change Blindness

The inability or difficulty in detecting changes within a visual scene, frequently due to misplaced attention or brief interruptions.