This experiment is called LTM AB.

In this HIT, you will have to remember some items and perform a simple attention task. You will need to do 5 blocks of this task, each of which takes about 4.5 minutes. It should take about 30 minutes total.
There will be three parts to each block.


In the first part of each block, you will see a series of objects that you will have to remember because you will be tested on them later. On each trial you will see an object for 3 seconds, which you should commit to memory. Here is an example of 3 memory trials in a row:


In the second part of each block, you will perform an attention task. Here is the basic structure of each trial:

In this task, you will see two targets. Each of these targets will be followed by a noise mask. The first target will be a real world object. The second target will be a turned visual grating. The visual grating will be turned either counterclockwise or clockwise from vertical. Examples of each are in the figure below. At the end of each trial, you will report which of two images you saw in that trial and which direction the target was turned using the "m" and "n" keys - as outlined in the instructions that you'll see when you get to that task. You may recognize some of these objects from the first part of the experiment.


In the third (and final) part of each block, you will be asked whether you saw some images in the first part of the block. Here is an example of 3 trials:

Your job is simply to report whether you saw each image in the first part of the block using the "m" and "n" keys - as outlined in the instructions that you'll see when you get to that task.


You will perform 6 blocks, which will include each of these tasks in this order. At the end of the experiment, you will be asked to answer a few demographic questions and get the opportunity to give some feedback. Thank you for participating!

Consent to Participate in Research:

By answering the following questions, you are participating in a study on cognition and perception. By participating you are confirming that you are over 18 years of age and have normal or corrected-to-normal vision. If you have questions about this research, or if you would like to receive a report of this research when it is completed, please contact Jonathan Keefe at jmkeefe@ucsd.edu. Your participation in this research is voluntary. You may decline to answer any or all of the following questions. You may decline further participation, at any time, without adverse consequences. Your anonymity is assured; the researchers who have requested your participation will not receive any personal information about you. By continuing, you are confirming that you understand these instructions and conditions of participation.

You will now see a series of 16 objects, which you should commit to memory for later test.
Each of these objects will be presented for 3 seconds. An example of 3 trials is included below.


You will now perform the attention task.
In this task, you will see two targets. Each of these targets will be followed by a noise mask. The first target will be a real world object. The second target will be a turned visual grating. The visual grating will be turned either counterclockwise or clockwise from vertical. Examples of each are in the figure below. At the end of each trial, you will report which of two images you saw in that trial and which direction the target was turned using the "m" and "n" keys.




You will now see a series of objects, one at a time. Report whether you remember seeing each object
in the first part of the block, in which you were asked to memorize a series of objects.
Press the "n" key if the object was not presented, and press the "m" key if you recall seeing that object.
An example of 3 trials is included below.


Which image was presented on this trial?
Press the "n" for the left image and "m" for the right image.

Which direction was the visual grating turned on this trial?

Press the "n" for if it was turned counterclockwise from vertical and "m" if it was turned clockwise from vertical.

Was this image shown in the memory task?
Press the "n" key if it was not and "m" key if it was.

Please take a short break in between blocks to rest your eyes!
When you click the button to proceed, you will begin the next block.

Almost done! Just enter your demographics information here:

Age:

Gender:
Male
Female

Any feedback about the experiment?

Thanks for doing a great job!