| A | B |
|---|
| plateau | level at which something is stabilized for a period of time |
| psychology | the study of the mind |
| tangible | observable; capable of being touched |
| specter | a disturbing thought |
| refute | to disprove |
| vacuous | empty; shallow; blank |
| obscure | to hide; hidden |
| convolutions | uneven ridges on the brain's surface;coils |
| fissure | narrow opening; crack |
| introspective | looking within oneself |
| progressive | improving; advancing |
| regress | to move backward to an earlier stage |
| impaired | made worse; weakened |
| syndrome | a group of signs characteristic of a certain condition |
| retardation | a hindrance;the condition of being slow in mental development |
| conscious | aware of one's existence |
| subconscious | below conscious awareness |
