Peak Shift Is Said to Occur When Two

question 108

Multiple Choice

Peak shift is said to occur when two

• A) stimuli are so similar that subjects have difficulty distinguishing between them, and thus the peak of the responses shifts so that they respond similarly to both.
• B) discriminative stimuli are very similar and produce maximal responding to a stimulus near the S^D and away from the S^Δ.
• C) similar stimuli are reinforced and produce a broader peak of maximal responding to more stimuli than would have occurred if only one stimulus had been reinforced.
• D) discriminative stimuli are dissimilar and produce maximal responding to a stimulus midway between the S^D and the S^Δ.

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Definitions:

Stolon

Stem that grows horizontally along the ground and may give rise to new plants where it contacts the soil—e.g., the runners of a strawberry plant.

Bulb

An underground storage organ formed from swollen plant parts, containing nutrient reserves to support the plant's next cycle of growth.

Rhizome

Rootlike underground stem.

Corm

A rounded underground storage organ consisting of swollen stem tissue, covered with scaly leaves, found in some plants serving for food storage and to survive winter or dry months.