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Measurements were made at intervals of 10 seconds during the
sessions of this study. The time of measurement is computed
from its position within the session, the starting time of
the session and the sampling interval (10 seconds). The
starting time of the session time-series was taken from the
session log sheet.
The start time of the session used in computing the time of
measurement is taken from the the log sheet. The time on
the log sheet was taken from the volunteers watch at the
time the EMDEX data collection was begun. The times from
the log sheet are recorded to the nearest minute. All times
from the log sheet are relative to the volunteer's watch.
Some times were estimated from the volunteer's memory, in
cases where location changes were not immediately recorded.
The difference between the EMDEX internal clock, which
determines the true sampling interval, and the watch time is
not thought to be significant for the period of interest.
The representation of the measurement time depends on the
data product. The value is computable to the nearest second.