Weber's Law states that a just noticeable change in a stimulus magnitude is ________ the original stimulus magnitude

One reason sickle-cell trait is of interest is because:

a. it illustrates how genetic disorders can lead to changes in personality b. it illustrates the importance of early dietary interventions c. it shows how a genetic disorder can be advantageous in certain environments d. it shows how teratogens can interact with genes to influence behavior

The underlying mechanism for perceptual expectancies is

a. a misleading perception that distorts or misjudges a stimulus. b. top-down processing. c. the organization of perception by beginning with low-level features. d. bottom-up processing.