In Experiment 1, participants were instructed to memorize the digits on Display 1 column by column, that is, from the top to the bottom on the left column, then from the top to the bottom on the right column.
In this experiment, participants were instructed to memorize the digits on Display 1 column by column, that is, from the top to the bottom on the left column, then from the top to the bottom on the right column.
In Experiment 3, participants were instructed to memorize the digits on Display 1 row by row, that is, memorize the top row first (from left to right), then middle row (if there are three digits in each column) and bottom row.
In this experiment, participants were instructed to memorize the digits on Display 1 row by row, that is, memorize the top digit in the left column and the top digit in the right column, until the bottom digit in the left column and the bottom digit in the right column.
Instead of memorizing the digits column by column from the top to the bottom, participants in Experiment 2 were instructed to memorize the digits on Display 1 (see Figure 2) column by column in a reversed order, that is, from the bottom to the top digit on the left column, then from the bottom to the top digit on the right column.
Instead of memorizing the digits column-by-column, participants in Experiment 3 were instructed to memorize the digits on Display 1 row-by-row from the top to the bottom, that is, memorize the top digit in the left column and the top digit in the right column, until the bottom digit in the left column and the bottom digit in the right column.
The stimulus, design, and procedure were the same as in Experiment 1, except of the instructions for memorizing the digits on Display 1.
The stimulus, design, and procedure were the same as in Experiment 1, except for the instructions for memorizing the digits on Display 1.
To ensure that participants memorized the digits in the instructed order, the digits were presented one at a time, 500 ms per digit, starting from the bottom digit to the top digit of the left column, then the bottom digit to the top digit of the right column.
All-digit dialing would create a cache of new phone numbers, but whether users could memorize the seven digits it entailed was an open question.
"The only reason anyone would memorize the three-digit code is if they used their credit cards a lot to buy things online, since almost all merchants require it to conclude an online transaction," Charles Tran, creditdonkey.com founder, said in a statement.
