Step 4b: Processing Main VHT Data
Table 5 contains the main VHT data of our example participant (whose practice VHT data are presented in Table 4).
As explained before, hits can only be found in the first column (i.e. “RespTime1” in Table 5). Responses in other columns are false alarms; “ResTime2” column in Table 5 has two reaction time values (3011ms and 3497ms) and both are false alarms. Also some of the “RespTime1” responses may actually be false alarms. To identify them, the reaction time criteria as defined previously using the practice VHT data are used. In our example, as is mentioned in Step 4a (i.e. processing practice VHT data), any reaction time in the main VHT which is below 49ms or above 1147ms is a false alarm. In accordance with this criterion, the participant in our example had 9 hits and 11 false alarms (9 in the first column and 2 in the second column); total 20 responses (see Table 5). All these values (i.e. total hits, total false alarms, and total response) are the outputs of this task and are used in the main statistical analysis.
Reaction time values in the main VHT data file