I believe the answer is: <span>make a decision about the stimulus.
It's written in this part of the research:
</span><span>. . .difference in reaction time between the simple and choice conditions of his . .
</span>Simple conditions resulted in fast reaction time, which also make it faster for individuals to make a decision about the stimulus. The opposite would happen if the conditions are more complicated.
"<span>For a time, geopolitical events and natural disasters had strong short-term effects on oil prices, such as </span>North Korean missile tests, <span>the </span>2006 conflict between Israel and Lebanon, <span>worries over </span>Iranian nuclear plans in 2006, Hurricane Katrina, <span>and various other factors.</span><span> By 2008, such pressures appeared to have an insignificant impact on oil prices given the onset of the </span>global recession.<span> The recession caused demand for energy to shrink in late 2008, with oil prices collapsing from the July 2008 high of $147 to a December 2008 low of $32.</span><span> Oil prices stabilized by August 2009 and generally remained in a broad trading range between $70 and $120 through November 2014,</span><span> before returning to 2003 pre-crisis levels by early 2016."</span>
An ionic solution would be able to conduct electricity where as the covalent would not so if you have a conductivity tester which are available in most labs you should be able to distinguish between the 2
