presTimeS2

Experiments

Caution

Legacy column. It still works in old experiments, but do not use it in new ones. Use presTime instead: it accepts one presentation time per screen, separated by semicolons.

Caution

Legacy column. It still works in old experiments, but do not use it in new ones. Use presTime instead: it accepts one presentation time per screen, separated by semicolons.

presTimeS2 is the older alias of presTime2. It overrides the presentation time of the second screen of a trial, and nothing else. It is only read when presTime2 is empty, and from there on the two columns behave identically. It has no other effect anywhere in an experiment. Do not use it in new trial files; put per-screen times in presTime as a semicolon list.

Syntax

Put a single whole number of milliseconds in the cell: it becomes the presentation time of the trial’s second screen.

None of the presTime forms (semicolon lists, min_max, a|b|c, V*N) work in this column.

Options

Value	Behavior
empty (or absent)	No override.
integer N	Second screen’s presentation time becomes N ms.
non-numeric	Override skipped.

Defaults & missing values

Leave the cell empty, or leave the column out, and nothing is overridden: the second screen keeps the time presTime gave it.

It is also ignored entirely whenever presTime2 has any value at all, including one that is not a number and therefore overrides nothing itself.

Works with

• presTime2: the same override under a newer name, and everything on its page applies here too. presTime2 wins when both cells are filled in.
• presTime: the value replaces the second screen’s time in the presTime list, before the trial works out whether the last screen should stay up until the participant responds.
• ISI and stimScreens: the trial needs a second screen for the override to do anything. That screen comes from an ISI gap on the legacy path, or from a multi-screen stimScreens grouping; the override works the same way in both cases.

Examples

1. Legacy cue then probe timing:

type	stimFormat	stim1	stim2	presTime	presTimeS2	ISI
test	.png	cue	probe	250	750	0

Screen 1 shows cue for 250 ms, ISI of 0 ms, screen 2 shows probe for 750 ms.

Tips & gotchas

• Same as presTime2: on a two-screen trial where presTime gives only one value, adding presTimeS2 makes the second screen hide on a timer instead of waiting for a response. On the legacy ISI path it also cannot be used without a positive presTime for screen 1. On a multi-screen stimScreens trial that limitation disappears, because an empty presTime is filled with the 1000 ms per-screen default first.

Caution

A presTime2 cell holding something that is not a number (for example abc) still counts as filled in, so it blocks presTimeS2 and then overrides nothing itself: the trial ends up with no override at all. Clear presTime2 if you mean presTimeS2 to apply.