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CalculateMarkerTimeDifference

Calculate difference between all markers and provided timestamps.

timestamps packet can be the output of ExtractMarkerTimestamps node (deprecated). Time difference will be stored as a new field/column in the instance axis data. Version 0.3.1

Ports/Properties

data

Data to process.

verbose name
Data
default value
None
port type
DataPort
value type
Packet (can be None)
data direction
INOUT

timestamps

Packet containing timestamps, usually from the output of ExtractMarkerTimestamps. If not provided then timestamps will be drawn from the data packet target_event.

verbose name
Timestamps
default value
None
port type
DataPort
value type
Packet (can be None)
data direction
IN

look_for

Direction to search for timestamp relative to each marker. Using 'next' will find reaction time from marker to timestamp.

verbose name
Look For
default value
next
port type
EnumPort
value type
str (can be None)

target_event

Only calculate time differences to this or these events. Pass as string or list of strings. If not provided then all events are considered potential targets.

verbose name
Target Event
default value
None
port type
DataPort
value type
object (can be None)
data direction
INOUT

target_field

verbose name
Target Field
default value
Marker
port type
StringPort
value type
str (can be None)

source_event

Only find time differences from this event in the data packet. If not provided them timestamps will be calculated from all events.

verbose name
Source Event
default value
None
port type
StringPort
value type
str (can be None)

source_field

verbose name
Source Field
default value
Marker
port type
StringPort
value type
str (can be None)

new_field_name

Name of field/column added to data instance table.

verbose name
New Field Name
default value
ReactionTime
port type
StringPort
value type
str (can be None)

transform

Time differences, or reaction times, are typically skewed and may have outliers. Transforming reaction time can help mitigate these problems, which is helpful before doing statistical analyses. https://opensiuc.lib.siu.edu/cgi/viewcontent.cgi?referer=&httpsredir=1&article=1077&context=tpr

verbose name
Transform
default value
none
port type
EnumPort
value type
str (can be None)

grouping_fields

When the timestamps input is not provided, thus both the source and target are taken from the same instance table, you can further constrain the search so target and source events will only be matched if they have equal values in all indicated grouping fields. Typical values for this parameter are one or more fields that key a unique trial id.

verbose name
Grouping Fields
default value
None
port type
ListPort
value type
list (can be None)

time_bounds_criteria

Optional list of [minimum, maximum] (absolute value seconds) allowed between the source and target time difference in order to be logged as valid. For example, in the case of response (reaction) times from stimulus, if a trial had a missing response (e.g. no target response marker found) this node will by default calculate the time difference from stimulus to the next trial's response marker and therefore log a reaction time that is not valid for the current trial. Setting this time bound criteria can ignore these cases and not mis-identify invalid reaction times. Example: [0, 2.5] only allows valid time differences >0 and <2.5 seconds (non-inclusive) to be logged.

verbose name
Time Bounds Criteria
default value
[]
port type
ListPort
value type
list (can be None)

add_to_existing

Add time differences to the existing field (defined in new_field_name) if it already exists in the data. (That allows this node to be run multiple times over the same data.)

verbose name
Add To Existing
default value
False
port type
BoolPort
value type
bool (can be None)

pattern_syntax

Optionally the syntax to use for the input marker patterns. If set to none, the input strings are not used as patterns but used to match a specific marker string verbatim. If set to wildcards, then the special character * can be used to match any number of characters (or none), while the character ? can be used to match any single character.

verbose name
Pattern Syntax
default value
none
port type
EnumPort
value type
str (can be None)

absolute_time

Always record time differences in absolute values.

verbose name
Absolute Time
default value
False
port type
BoolPort
value type
bool (can be None)

set_breakpoint

Set a breakpoint on this node. If this is enabled, your debugger (if one is attached) will trigger a breakpoint.

verbose name
Set Breakpoint (Debug Only)
default value
False
port type
BoolPort
value type
bool (can be None)

metadata

User-definable meta-data associated with the node. Usually reserved for technical purposes.

verbose name
Metadata
default value
{}
port type
DictPort
value type
dict (can be None)