Binocular Vision and Perception Flashcards

Practice questions covering the fundamentals, mechanisms, development, and psychophysics of binocular vision and perception.

According to the transcript, how is 'Vision' distinguished from 'Sight'?

Sight is the ability of the eyes to detect light, whereas Vision is the brain's interpretation of that visual information.

What is the specific anatomical location where vision is perceived and interpreted in the occipital lobe?

The primary visual cortex, also known as $\text{Brodmann Area } 17$.

How is 'Binocular Vision' defined in the lecture notes?

A state of simultaneous vision with two seeing eyes when an individual fixes visual attention on an object of regard.

What are the five prerequisites for Binocular Vision?

$1.$ Proper fixation with each eye, $2.$ reflex activities producing fusional movements, $3.$ approximately similar retinal images, $4.$ overlapping visual fields, and $5.$ a common visual direction.

What is the focus of the Sensory Mechanism in the development of Binocular Vision?

It is concerned with the visual apparatus and proprioceptive receptors of the extrinsic ocular muscles.

What is the primary concern of the Motor Mechanism in Binocular Vision?

The maintenance of the two eyes in a correct positional relationship at rest and in motion.

Where do all but one of the postural reflexes originate?

In the $\text{midbrain}$.

Which structures control the Static Postural Reflex?

The utricle and saccule (parts of the labyrinth) and proprioceptive impulses from the neck muscles.

What is the difference between Static and Stato-kinetic Postural Reflexes?

Static reflections respond to head position relative to the body, while Stato-kinetic reflexes respond to head acceleration and deceleration relative to space via the semi-circular canals.

Unlike unconditioned postural reflexes, how are 'Fixation Reflexes' categorized?

They are categorized as conditioned reflexes (psycho-optical).

By what age are Conjugate-Fixation and Disjunctive/Vergence Fixation Reflexes typically well established?

At the age of $6\text{ months}$.

When is the Correction-Fusion Reflex fully developed?

After the age of about $5\text{ years}$.

According to the developmental timeline, when does Binocular Fusion and Stereopsis typically develop?

Binocular fusion develops at $3\text{ months}$, and stereopsis develops between $3-6\text{ months}$.

What are the three grades of Binocular Vision described by Claude Worth ($1901$)?

$I.$ Simultaneous perception, $II.$ Fusion, and $III.$ Stereoscopic vision.

How does Sensory Fusion differ from Motor Fusion?

Sensory Fusion is the unification of retinal images into one mental impression, while Motor Fusion is the ability to use eye movements to maintain alignment for that single image.

What is the etymological origin of the word 'Stereopsis'?

It comes from the Greek words 'stereos' ($\text{solid}$) and 'opsis' ($\text{look}$).

What specific type of retinal disparity is required to produce a stereoscopic effect?

Horizontal disparity (vertical disparity produces no effect).

What is the prerequisite for a fused image to be perceived in depth?

The fused image must lie within $\text{Panum's area}$.

In psychophysics, what is the difference between 'Location' and 'Localization'?

Location is the position in objective space, while Localization is the position in subjective space.

Which retinal element is responsible for the principal visual direction ($F$)?

The fovea.