The paradigm registry: default event sequences and required fields
Source:R/paradigms.R
PARADIGMS.RdEach event is a list with type (fixation | text | mask | blank |
region_by_region | response | question | feedback), content (a literal or a
{field} reference), an optional trigger (a whole-number EEG code from 1 to 255
or the token "condition"/"item"), onset_locked, response keys/timeout_ms, a
response's from (where its window opens: "onset", with the text event before it,
which is the default after a text event, or "offset", once that has gone), a text
event's case ("upper" or "lower", applied by the runners as they show the text), a
mask's length_of (the fields whose longest text, in characters, sets how often its
one-character content is repeated), and an optional blocks restricting the event to
named blocks.
Format
A named list with one entry per paradigm (factorial,
lexical_decision, priming, masked_priming, categorisation,
self_paced_reading), each holding
stimulus_fields, a counterbalance recipe and an events list.
Value
A plain named list (class "list"; no package-specific class) of
built-in paradigm specifications. Each element contains stimulus_fields,
a character vector naming required item-table fields; counterbalance, a
character scalar naming the counterbalancing recipe; and events, an
ordered list of event-specification lists. The selected entry supplies the
default trial sequence, required item fields, and counterbalancing rule
inherited by a design that names that paradigm.
Details
priming is backward-masked: a 50 ms prime, a 33 ms ##### mask and the target,
with no forward mask and the item table's letter case. masked_priming follows
Forster and Davis (1984): a forward mask of hash marks for 500 ms, a lower-case prime
for three frames and an upper-case target that stays on until the response or for
2,000 ms.
References
Forster, K. I., & Davis, C. (1984). Repetition priming and frequency attenuation in lexical access. Journal of Experimental Psychology: Learning, Memory, and Cognition, 10(4), 680-698. doi:10.1037/0278-7393.10.4.680