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03_cogdataset/index.html

@@ -378,6 +378,44 @@ <h2 id="data-acquisition">Data Acquisition</h2>
 <h3 id="stimuli">Stimuli</h3>
 <p>Stimuli belonged to four categories that naturally fell into two groups that were clearly distinct from each other: pictures (20 faces and 20 objects) and symbols (20 letters and 20 false-fonts). Face stimuli were created using the FaceGen Modeler 3.1 program and object stimuli were taken from the Object Databank (Tarr, 1996). Faces and objects were grey-scaled (RGB: 125, 125, 125), and manipulated to have similar size and equal luminance using the SHINE toolbox (Willenbockel et al., 2010). Equal proportions of male and female faces were presented. They all had hair and belonged to different ethnicities (e.g., Caucasian, Asian, African, American) to facilitate face individuation. The orientation of the stimuli was manipulated, such that half of the stimuli from each category had a side view and the other half a front view. All letter stimuli and false fonts were generated with MAXON CINEMA 4D Studio (RC-R20) 20.059 on macOS 10.14, appearing in gray (RGB: 125, 125, 125). Three views were rendered for each font set (real font, false/pseudo font) at 0°, 30° and -30° horizontal viewing angle with the following settings: Extrusion depth 9.79% of character height, camera distance 5.65 times character height and 18° above the center of the letter (High Angle), with a simulated focal length of 135 mm (35 mm equiv.). All stimuli were presented on a rectangular aperture at an average visual angle of 6 ̊ by 6 ̊.</p>
 <h3 id="procedure">Procedure</h3>
+<table>
+<thead>
+<tr>
+<th></th>
+<th></th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td><strong>Term</strong></td>
+<td><strong>Definition</strong></td>
+</tr>
+<tr>
+<td>Stimuli</td>
+<td>Visual items presented to the subjects during the experiment, with half being task-relevant and the other half task-irrelevant.</td>
+</tr>
+<tr>
+<td>Trial</td>
+<td>A single instance of presenting a stimulus to the subject and recording their response. <br><br>Each trial consisted of presenting a single stimulus for a specific duration.</td>
+</tr>
+<tr>
+<td>Runs</td>
+<td>The number of times a subject completed the full experimental session. <br><br>Each run consisted of a series of blocks separated by rest breaks.</td>
+</tr>
+<tr>
+<td>Block</td>
+<td>A segment within each run containing a set of trials with a specific experimental setup or condition. <br><br>Each block was composed of 4 mini blocks.</td>
+</tr>
+<tr>
+<td>Mini block</td>
+<td>A subsegment within each block. <br><br>In each mini block, a number of stimuli were presented to the subjects.</td>
+</tr>
+<tr>
+<td>Break</td>
+<td>Intervals between blocks that allowed subjects to rest and prepare for the next series of trials.</td>
+</tr>
+</tbody>
+</table>
 <p>Stimuli were presented sequentially, all supra-threshold, with half being task-relevant and the other half task-irrelevant. Only one stimulus was shown on the screen at any given time. To define task relevance, subjects were instructed to detect (press a button; non-speeded response) two targets from different categories, regardless of their orientation. This online reporting enabled an explicit assessment of subjects’ performance, engaging report-related areas for later analysis. Each block began with notification of the two target stimuli, either pictorial (faces and objects) or symbolic (letters and false fonts), creating a clear distinction between relevant and irrelevant stimuli. At the start of each block, specific target stimuli were revealed with instructions such as “detect face A and object B” or "detect letter C and false-font D." Targets did not repeat across blocks. Each run included two blocks of the Face/Object task and two blocks of the Letter/False-font task, with the order counterbalanced across runs. Subjects were instructed to maintain central fixation throughout each trial. Gaze was monitored online through an eye tracker, with repeated calibrations ensuring good quality data.</p>
 <p>Each block comprised stimuli from all four categories, with each stimulus displayed for 500, 1000, or 1500 ms, followed by a blank interval, ensuring a consistent trial duration of 2000 ms. To  avoid  periodic  presentation  of  the  stimuli, random jitter was added to the end of each trial (mean inter-trial interval of 400 ms, jittered 200-2000 ms, with truncated  exponential  distribution). Within each block, three trial types were presented: i) Task Relevant Targets, consisting of the specific stimuli participants were tasked with detecting; ii) Task Relevant Non-Targets, encompassing stimuli from relevant categories that were not designated targets; and iii) Task Irrelevant Stimuli, comprising stimuli from the remaining categories.</p>
 <p>Trial division was pseudorandomized with respect to two factors: the assignment of non-target stimuli to a miniblock, and the number of trials with specific durations within each task-relevance level. The assignment of non-targets was restricted by two constraints: i) Each stimulus was presented an equal number of times as a non-target stimulus (and as an irrelevant one) throughout the experiment. ii) Non-targets were, by definition, different from the targets in that specific miniblock. To meet these constraints, two pseudorandomized versions were made where the targets and non-target stimuli of each miniblock were determined. Three additional versions were prepared for each target/non-target division to balance the duration division between categories and orientation. In each version, slight imbalances (maximum difference of four trials) existed between the different durations for each condition (targets, non-targets, irrelevant). This imbalance was a necessary consequence of keeping the balance in duration and category across orientation and across categories as the numbers were not evenly divisible by three. The imbalances canceled out over the entire experiment so there was a perfect duration balance across the experiment: an equal amount of stimuli were presented for 500, 1000 and 1500 ms durations. The imbalances between durations within each relevant condition were balanced across the three versions. In total, six different versions were assigned to the subjects in consecutive order, repeating every six subjects. To get more details, please see the “Trial counts” section in <a href="https://osf.io/gm3vd">COGITATE Preregistration, v4</a>.</p>
@@ -406,20 +444,15 @@ <h4 id="anatomical-mri-data-acquisition">Anatomical MRI Data Acquisition</h4>
 <h4 id="behavioral-data-acquisition">Behavioral Data Acquisition</h4>
 <p>The task was executed using Matlab (CHBH: R2019b, PKU: R2018b) with Psychtoolbox v.3 (Pelli, 1997) on a custom PC at CHBH and a Dell XPS desktop PC at PKU. Visual stimuli were presented on a screen placed in front of the subjects with a PROPixx DLP LED projector (VPixx Technologies Inc.) at a resolution of 1920 x 1080 pixels and a refresh rate of 120 Hz. The distance between the subject’s eyes and the screen was different at each site (CHBH: 119 cm, PKU: 85 cm) to achieve the same FOV of 36.6 x 21.2 degrees. Participants responded with both hands using two 5-button response boxes (CHBH: NAtA, PKU: SINORAD).</p>
 <h4 id="eye-tracking-data-acquisition">Eye Tracking Data Acquisition</h4>
-<p>Eye movements were monitored and recorded from both eyes (binocular eye-tracking) using the MEG-compatible EyeLink 1000 Plus eye-tracker (SR Research Ltd., Ottawa, Canada). Nine-point calibration was performed at the beginning of the experiment, and recalibrated if necessary at the beginning of each block/word. Pupil size and corneal reflection data were collected at a sampling rate of 1000 Hz.</p>
+<p>Eye movements were monitored and recorded from both eyes (binocular eye-tracking) using the MEG-compatible EyeLink 1000 Plus eye-tracker (SR Research Ltd., Ottawa, Canada). Nine-point calibration was performed at the beginning of the experiment, and recalibrated if necessary at the beginning of each block. Pupil size and corneal reflection data were collected at a sampling rate of 1000 Hz.</p>
+<p>The channel name that contains the eye tracker data in the FIF file is as follows: MISC1 (X), MISC2 (Y), and MISC3 (pupil)</p>
 <h4 id="behavioral-data-code-scheme">Behavioral Data Code Scheme</h4>
 <p>Stimuli are coded as a 4-digit number.<br />
 1st digit = stimulus type (1 = face; 2 = object; 3 = letter; 4 = false font)<br />
 2nd digit = stimulus orientation (1 = center; 2 = left; 3 = right)<br />
 3rd &amp; 4th digits = stimulus id (1...20; for faces 1...10 is male, 11...20 is female)  </p>
 <p>e.g., "1219" = 1 is face, 2 is left orientation and 19 is a female stimulus #19</p>
 <h4 id="eye-tracker-and-meg-code-scheme">Eye Tracker and MEG Code Scheme</h4>
-<p>The channel name that contains the eye tracker data in the FIF file is as follows: MISC1 (X), MISC2 (Y), and MISC3 (pupil)</p>
-<h5 id="defining-some-terms"><strong>Defining some terms</strong></h5>
-<p><strong>Trial</strong>: Stimulus presentation followed by a fixation (the two add up to 2 sec) followed by a jitter of 200 msec to 2000 ms.</p>
-<p><strong>Mini block</strong>: presentation of 34 to 38 stimuli, in the beginning of which the target stimuli were presented.</p>
-<p><strong>Block</strong>: composed of 4 mini blocks. At the end of each block, there was a break.</p>
-<p><strong>Break</strong>: Pause between 2 blocks</p>
 <h5 id="successive-trigger-scheme"><strong>Successive trigger scheme</strong></h5>
 <p>The triggers were sent successively. The first trigger represented the stimulus type, followed by orientation, stimulus duration, and task relevance, all interspaced by 50 ms. Additionally, a trigger was sent upon key press.</p>
 <h5 id="1st-trigger-on-stimulus-onset-stimulus-type"><strong>1st Trigger (on Stimulus Onset): Stimulus Type</strong></h5>

index.html

@@ -202,5 +202,5 @@ <h1 id="welcome-to-the-cogitate-data-release-documentation">Welcome to the Cogit
 
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