Study: NCT05894967

Intervention type: BEHAVIORAL
Group type: EXPERIMENTAL
Intervention: C1 - Standard Perceptual Learning (SPL)
Description: Each trial starts with a fixation point (500ms) after which a Gabor (1° radius, at cut-off SF of 25% accuracy, estimated from Pre-Test CSF, at either 45° or 135°) appears for 128ms. The task is to indicate whether the Gabor was tilted left or right. Gabor contrast will be controlled by a 3/1 staircase (converging on approximately \~80% contrast threshold) across all training sessions.

Intervention type: BEHAVIORAL
Group type: EXPERIMENTAL
Intervention: C1 - Standard Perceptual Learning (SPL)
Description: Each trial starts with a fixation point (500ms) after which a Gabor (1° radius, at cut-off SF of 25% accuracy, estimated from Pre-Test CSF, at either 45° or 135°) appears for 128ms. The task is to indicate whether the Gabor was tilted left or right. Gabor contrast will be controlled by a 3/1 staircase (converging on approximately \~80% contrast threshold) across all training sessions.

Intervention type: BEHAVIORAL
Group type: EXPERIMENTAL
Intervention: C1 - Standard Perceptual Learning (SPL)
Description: Each trial starts with a fixation point (500ms) after which a Gabor (1° radius, at cut-off SF of 25% accuracy, estimated from Pre-Test CSF, at either 45° or 135°) appears for 128ms. The task is to indicate whether the Gabor was tilted left or right. Gabor contrast will be controlled by a 3/1 staircase (converging on approximately \~80% contrast threshold) across all training sessions.

Intervention type: BEHAVIORAL
Group type: EXPERIMENTAL
Intervention: C1 - Standard Perceptual Learning (SPL)
Description: Each trial starts with a fixation point (500ms) after which a Gabor (1° radius, at cut-off SF of 25% accuracy, estimated from Pre-Test CSF, at either 45° or 135°) appears for 128ms. The task is to indicate whether the Gabor was tilted left or right. Gabor contrast will be controlled by a 3/1 staircase (converging on approximately \~80% contrast threshold) across all training sessions.

Intervention type: BEHAVIORAL
Group type: EXPERIMENTAL
Intervention: C1 - Standard Perceptual Learning (SPL)
Description: Each trial starts with a fixation point (500ms) after which a Gabor (1° radius, at cut-off SF of 25% accuracy, estimated from Pre-Test CSF, at either 45° or 135°) appears for 128ms. The task is to indicate whether the Gabor was tilted left or right. Gabor contrast will be controlled by a 3/1 staircase (converging on approximately \~80% contrast threshold) across all training sessions.

Intervention type: BEHAVIORAL
Group type: EXPERIMENTAL
Intervention: C1 - Standard Perceptual Learning (SPL)
Description: Each trial starts with a fixation point (500ms) after which a Gabor (1° radius, at cut-off SF of 25% accuracy, estimated from Pre-Test CSF, at either 45° or 135°) appears for 128ms. The task is to indicate whether the Gabor was tilted left or right. Gabor contrast will be controlled by a 3/1 staircase (converging on approximately \~80% contrast threshold) across all training sessions.

Intervention type: BEHAVIORAL
Group type: OTHER
Intervention: C1 - Standard Perceptual Learning (SPL)
Description: Each trial starts with a fixation point (500ms) after which a Gabor (1° radius, at cut-off SF of 25% accuracy, estimated from Pre-Test CSF, at either 45° or 135°) appears for 128ms. The task is to indicate whether the Gabor was tilted left or right. Gabor contrast will be controlled by a 3/1 staircase (converging on approximately \~80% contrast threshold) across all training sessions.

Intervention type: BEHAVIORAL
Group type: EXPERIMENTAL
Intervention: C1 - Standard Perceptual Learning (SPL)
Description: Each trial starts with a fixation point (500ms) after which a Gabor (1° radius, at cut-off SF of 25% accuracy, estimated from Pre-Test CSF, at either 45° or 135°) appears for 128ms. The task is to indicate whether the Gabor was tilted left or right. Gabor contrast will be controlled by a 3/1 staircase (converging on approximately \~80% contrast threshold) across all training sessions.

Intervention type: BEHAVIORAL
Group type: EXPERIMENTAL
Intervention: C2 - Long Training (LT)
Description: Will be the same as the SPL with the exception that each session in LT will be twice as long as in SPL.

Intervention type: BEHAVIORAL
Group type: EXPERIMENTAL
Intervention: C2 - Long Training (LT)
Description: Will be the same as the SPL with the exception that each session in LT will be twice as long as in SPL.

Intervention type: BEHAVIORAL
Group type: OTHER
Intervention: C2 - Long Training (LT)
Description: Will be the same as the SPL with the exception that each session in LT will be twice as long as in SPL.

Intervention type: BEHAVIORAL
Group type: EXPERIMENTAL
Intervention: C3 - Short Staircases (SS)
Description: Will be largely the same as SPL with the only difference being a change to the adaptive procedure. SS will use so-called short-staircases, which are initialized at 60% contrast with steps of .05 log units and employs a 3/1 staircase that after every 40 trials is reset (the short in short-staircases) back to 60% contrast.

Intervention type: BEHAVIORAL
Group type: EXPERIMENTAL
Intervention: C3 - Short Staircases (SS)
Description: Will be largely the same as SPL with the only difference being a change to the adaptive procedure. SS will use so-called short-staircases, which are initialized at 60% contrast with steps of .05 log units and employs a 3/1 staircase that after every 40 trials is reset (the short in short-staircases) back to 60% contrast.

Intervention type: BEHAVIORAL
Group type: OTHER
Intervention: C3 - Short Staircases (SS)
Description: Will be largely the same as SPL with the only difference being a change to the adaptive procedure. SS will use so-called short-staircases, which are initialized at 60% contrast with steps of .05 log units and employs a 3/1 staircase that after every 40 trials is reset (the short in short-staircases) back to 60% contrast.

Intervention type: BEHAVIORAL
Group type: EXPERIMENTAL
Intervention: C4 - Mixed Difficulty (MD)
Description: This condition will be identical to SPL with the exception that two staircases - one a 2/1 staircase producing difficulties centered around 60-70% accuracy, the other a 4/1 staircase producing difficulties centered around 85-95% accuracy - will be utilized to control the stimuli.

Intervention type: BEHAVIORAL
Group type: EXPERIMENTAL
Intervention: C4 - Mixed Difficulty (MD)
Description: This condition will be identical to SPL with the exception that two staircases - one a 2/1 staircase producing difficulties centered around 60-70% accuracy, the other a 4/1 staircase producing difficulties centered around 85-95% accuracy - will be utilized to control the stimuli.

Intervention type: BEHAVIORAL
Group type: OTHER
Intervention: C4 - Mixed Difficulty (MD)
Description: This condition will be identical to SPL with the exception that two staircases - one a 2/1 staircase producing difficulties centered around 60-70% accuracy, the other a 4/1 staircase producing difficulties centered around 85-95% accuracy - will be utilized to control the stimuli.

Intervention type: BEHAVIORAL
Group type: EXPERIMENTAL
Intervention: C5 - Noise Training (NT)
Description: The NT condition will be the same as SPL with the exception that contrast thresholds will be estimated in 5-different levels of external noise (10%, 15%, 20%, 25%, 30%).