Difference thresholds are determined by a constant fraction of ...

[ereecah]

Difference thresholds are determined by a constant fraction of the magnitude of the original stimulus. This is the premise of
 
  a. Weber's law.
  b. selective attention theory.
  c. Gestalt laws of perceptual organization. d. signal-detection theory.
  e. the volley principle.

Question 2

Which activity might allow Gwyneth to help her six-month-old granddaughter develop object permanence?
 
  a. playing peek-a-boo with her
  b. singing the alphabet song with her
  c. singing songs like Itsy Bitsy Spider
  d. playing patty-cake with her
  e. reading children's books to her

[yuyiding]

Answer to Question 1

a

Answer to Question 2

a