Answer:
Sperling; iconic.
Step-by-step explanation:
In 1960, George Sperling performed several experiments to show the existence of iconic memory which is the subtype of sensory memory.
In his experiment in the 1960s, Sperling used a tachistoscope that was used to improve the reading speed of people. He flashed an image on the screen for less a second and observed that his participants were able to recall only 3-4 letters out of 12 letters displayed. The visual impression was named visual icon or iconic memory.
So, the correct answer is Sperling and iconic.