Figure 1
Schematic representation of the presentation of digits during the PyVDT. The software shows single digits, one at a time, on screen. Digits change according to the presentation rate. The three rightmost (i.e., most recently presented) digits make up a target sequence (i.e., any sequence beginning with an even digit, followed by an odd digit, and ending with an even digit). Pressing the space bar while the final digit in a target sequence (here, the number two) is displayed would count as a “hit”, whereas failing to press the space bar in this case would count as a “miss”. Pressing the space bar at the end of a non-target sequence (e.g., the three leftmost digits) would count as a “false alarm”, whereas failing to press the space bar would count as a “correct rejection”. See Macmillan and Creelman [14] for a detailed discussion of these four response types.
Figure 2
PyVDT configuration dialog.