The Ability to Perceive a Rod as Being Continuous Behind

question 4

Multiple Choice

The ability to perceive a rod as being continuous behind an occluding block

• A) is innate.
• B) is common in one-week-old infants.
• C) can be accomplished by three-month-olds.
• D) occurs only after sharp acuity is developed.

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Definitions:

Blastocyst

An early stage in the development of an embryo, consisting of a sphere of cells surrounding a fluid-filled cavity, before implantation in the uterus.

Ectoderm

The outermost layer of cells or tissue of an embryo in early development, which gives rise to the central nervous system, skin, and other structures.

Endoderm

The innermost layer of cells or tissue of an embryo in early development, which gives rise to the lining of some internal structures like the gut.

Blastocyst

An early stage of embryonic development characterized by a sphere of cells enclosing a fluid-filled cavity and the inner cell mass that will develop into the embryo.