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3

It depends on the types of changes you are looking to make. In general, my experience has been that changes to a response scale can be done with minimal threats to validity (e.g. looking to change the 4 item Likert type scale to a 6 item Likert type scale). On the other hand, changing question wording itself usually can't be done "without losing validity" ...


2

Short answer: The data is likely to be noisier, the absolute reaction time can't be trusted, but given enough power (which is easy to obtain on the Internet) relative reaction time differences should be similar to those in the lab. However, web-based reaction time studies might pose other problems, because you have less control over stimulus presentation and ...


3

There are a few factors that could contribute to differences between online versus in-lab reaction time measurement. Hardware variation Participants in an online experiment will use their own computers to complete the task, which will result in lots of variation in hardware. Many studies have looked at how hardware variations affect response time ...


1

Depending on how you collect the data, reaction times collected "online" will likely be different from those collected "on-site". When considering reaction times, it is important to decide if the reaction time is being used as a trigger, as the time to a response, or the difference in the time to response. Consider an experiment which displays a random ...


2

The main threat to a design's validity from increasing the amount of trials in any experiment comes from participant motivation and attention. After sitting in front of a monitor for a while, participants get tired, as anyone would. As a personal rule of thumb, a session should therefore not go beyond 40 minutes without breaks if possible. Rather than going ...


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Subjective value is most often manipulated using some sort of incentive structure in attentional studies. Most commonly, the reward is in the form of time or money earned either directly or through 'points.' This is a very simple and common thing to do, so I don't know what you mean by "reproducible details" -- most studies will report little more than ...


3

Anxiety and stress are very available states, and since you want to know how people currently feel (rather than some more implicit construct), you probably can't do much better than just asking them. A single-item anxiety measure as suggested by mlt should work.


0

Just found out that the upcoming Apple Research Kit for iPhone allows for some kinds of motor and touch activity monitoring. Maybe some of these can be re-purposed to collect data relevant to the original question.


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You can use Ibex, if you want to run it online: http://spellout.net/ibexfarm/ But in any case you should be able to upload the files in Linger, you'll need to do it centered since Linger doesn't support right-to-left languages. And you should check the encoding of the files. It should be ISO 8859-15 and not UTF-8.


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There's a program called Paradigm that has built-in support for Self-Paced Reading, it also handles Arabic characters. You'll just type in your sentences and then use back-slashes to specify each segment. For example: The actress\shot\the officer\who\was standing\on the balcony Paradigm will log a timestamp for the onset of each segment (in Excel) so it's ...



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