Question

stereograms appear to be composed entirely of random dots. however, they contain separate images that a viewer can “fuse” into a three - dimensional (3d) image by staring at the dots while defocusing the eyes. an experiment was performed to determine whether knowledge of the embedded image affected the time required for subjects to fuse the images. one group of subjects (group nv) received no information or just verbal information about the shape of the embedded object. a second group (group vv) received both verbal information and visual information (specifically, a drawing of the object). the experimenters measured how many seconds it took for the subject to report that he or she saw the 3d image. complete parts a - c.
a) what two variables are discussed in this description?
a. group and the 3 - d image viewed
b. fusion time and group
c. fusion time and age
d. fusion time and the 3 - d image viewed

Explanation:

Step1: Identify variables in the experiment

The experiment measures the time it takes for subjects to report seeing a 3 - D image and also differentiates between groups (NV and VV) based on the type of information they receive. The two main variables of interest are the time it takes for the subjects to fuse the images (fusion time) and the group they belong to (NV or VV).

Step2: Analyze multiple - choice options

Option A mentions group and 3 - D image viewed which is too general. Option B only mentions fusion time and group which is correct as these are the two key aspects being studied. Option C mentions fusion time and age but age is not mentioned in the experiment description. Option D mentions fusion time and 3 - D image viewed which is not as specific as the group factor which is a key variable.

Answer:

B. Fusion time and group