Sentence examples for an invalid trial from inspiring English sources
If an invalid trial was selected from the urn, the final payment was only the show-up fee of $15.
The arrow was followed in 44% of the trials by the appearance of the target (a large asterisk) at the cued location (a "valid" trial), in another 16% of the trials at the opposite location (an "invalid" trial), and in 20% of trials, no target appeared (a "noise" trial).
For example, RT costs of invalid cueing are larger after a valid than after an invalid trial (Jongen and Smulders 2007)—and RTs to invalid targets increase with the number of preceding valid trials (Vossel et al. 2011).
A valid trial was defined as a stimulus bar being presented at the cued peripheral location, and an invalid trial was defined as a stimulus bar being presented at the uncued (opposite to the cued location) peripheral location.
In the 20% invalid trial, the target line segment would appear in the shape singleton (the green diamond).
As expected, as precision (confidence in the validity of the cue) increases, there is a RT benefit for valid trials and an equivalent cost for invalid trials.
It is well established that reaction times (RT) are shorter when the target appears at the cued location (in valid trials) than when it appears at an uncued location (in invalid trials).
A RT advantage for valid compared to invalid trials in a cued attention paradigm was also reported by Freunberger and colleagues as well as by Sauseng and colleagues, who showed a larger P1 and alpha power for task-irrelevant trials on ipsilateral sites (Freunberger et al., 2008) and 10 Hz frequency specific effects in visual short-term memory using TMS (Sauseng et al., 2011).
An extensive literature indicates that such "invalid" trials involve a set of complex operations, including both spatial and non-spatial processes (e.g., breaches of expectation, resetting of current attention priorities [Corbetta et al., 2008; Doricchi et al., 2010; Geng et al. 2006; Vossel et al., 2006]).
To examine whether there was a bias for threat in disengagement processes, an ANOVA of RTs from invalid trials was carried out with anxiety and cue valence (angry and neutral) as IVs.
Most importantly, the two VL patients now displayed a reversed invalidity effect and responded faster in invalid trials compared to neutral trials (see Figure 2G).
