Describe how the visual system detects edges
What will be an ideal response?
Answer: If there are light and dark surfaces next to each other forming an edge separating the surfaces, center-surround receptive fields are excited by the light surface but inhibited by the darker surface. Additionally, the center-surround receptive fields on the border between the light and dark surfaces respond differently since these receptive fields startle both the light and dark sides. On the light side, the center of these receptive fields is excited by the light and a portion of the surround is excited by the dark, producing a heightened response. Conversely, on the dark side, the center is inhibited by the dark and a portion of the surround is inhibited by the light, producing a more negative response. The resulting perception is an edge but one with Mach bands.
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The long-held understanding of cocaine and methylphenidate is that these drugs act as ____________________, though researchers recently theorized that they may also act as ____________________
a. DAT inverse agonists; SERT inverse agonists b. competitive reuptake inhibitors; DAT inverse agonists c. competitive substrate-releasing agents; competitive reuptake inhibitors d. NET inverse agonists; competitive reuptake inhibitors e. DAT antagonists; NET antagonists
Psychological factors can play a much greater role in helping to prevent ______ than in helping to prevent ______.
a. cancers; infectious diseases b. cancers; influenza c. influenza; chronic illnesses d. chronic illnesses; infectious diseases