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Hi David (and everyone):
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<div class="">Online testing has such promise and yet has new frustrations.</div>
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<span class="">First, what you are experiencing is not a lookit problem. Computers suppress what it interprets as background noise when recording. We have found that we hear the sound pretty reliably for some experiments but not for others, and sometimes we
hear some sounds but not others. I suspect it depends on the nature of the sound and the volume. Bottom line: it doesn’t matter how you are recording, if you collect data online you can’t depend on hearing the sound of the stimuli. <br class="">
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</span><span class="">Moreover, even if you do hear sound, it is likely out of sync with the video. You may notice that when you see a child speak what you hear is out of sync with the video. Again, this is variable and there is no easy way to correct it. This
is a known problem with video recording and with Lookit. You can find more info here: <a href="https://lookit.readthedocs.io/en/develop/researchers-lag-issues.html" class="">https://lookit.readthedocs.io/en/develop/researchers-lag-issues.html</a><br class="">
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<div class=""><span class="">A better solution is to use the timing info provided by lookit. However, this also is not exact. We (and others) have done extensive testing of the timing of stimulus presentations in lookit and have found that there is some variation
in when stimuli start relative to when lookit says they start. I don’t think this has been solved and I don’t think it is known why it happens.</span></div>
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<div class=""><span class="">We have tested hundreds of kids using online methods for the last 3 years and my recommendations are (1) don’t rely on sound for timing, and (2) online methods are best for stimuli that are static or if it doesn’t matter when the
infant looks relative to what is happening in the stimulus.</span></div>
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<div class=""><span class="">This probably isn’t the answer you wanted, but I hope it is helpful as you find a solution.</span></div>
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<div class=""><span class="">Lisa</span></div>
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Lisa M. Oakes<br class="">
Professor, Department of Psychology<br class="">
Faculty Researcher, Center for Mind and Brain<br class="">
University of California, Davis<br class="">
267 Cousteau Place<br class="">
Davis, CA 95618<br class="">
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phone: 530 754-4523 OR</div>
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530 754-8304<br class="">
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Pronouns: she/her/hers</div>
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<span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none; caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"><span><span></span></span></span><span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none; caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"></span><span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none; caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"></span><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none;"></span><span><img apple-inline="yes" id="127FB8DA-6EB0-4CD5-9C55-D527A07A7C43" src="cid:42BAFC46-1CBF-4718-B59D-003D4D71FFAA@cmb.ucdavis.edu" class=""></span>
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<div class="">On Mar 18, 2023, at 8:45 AM, Lewkowicz, David <<a href="mailto:david.lewkowicz@yale.edu" class="">david.lewkowicz@yale.edu</a>> wrote:</div>
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Dear Melissa,<o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
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Recently, we have noticed that the participant videos recorded by Lookit seem to filter out the stimulus sounds that we normally present in our videos. We use these sounds to mark the beginning of a trial when we code the participant videos and, thus, their
absence makes it impossible for us to reliably code the participant videos. Are you aware of this and, if so, is there a fix for this problem?<o:p class=""></o:p></div>
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Thanks very much in advance for looking into this problem.<o:p class=""></o:p></div>
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Best regards,<o:p class=""></o:p></div>
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David & Dick<o:p class=""></o:p></div>
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<span style="" class="">__________________________________________<o:p class=""></o:p></span></div>
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<span style="" class="">David J. Lewkowicz, Ph.D.<o:p class=""></o:p></span></div>
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<span style="" class="">Senior Scientist<o:p class=""></o:p></span></div>
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<span style="" class="">Haskins Laboratories, New Haven, CT</span><span style="font-size: 12pt; font-family: "Times New Roman", serif;" class=""><o:p class=""></o:p></span></div>
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<span style="" class="">Yale Child Study Center<span class="Apple-converted-space"> </span><o:p class=""></o:p></span></div>
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Personal:<span class="Apple-converted-space"> </span><a href="https://haskinslabs.org/people/david-lewkowicz" class=""><span style="color: rgb(5, 99, 193);" class="">https://haskinslabs.org/people/david-lewkowicz</span></a><o:p class=""></o:p></div>
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Lab:<span class="Apple-converted-space"> </span><a href="http://llamblab.haskins.yale.edu/" class=""><span style="color: rgb(5, 99, 193);" class="">http://llamblab.haskins.yale.edu/</span></a><o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
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<o:p class=""> </o:p></div>
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<span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">_______________________________________________</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class="">
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<a href="mailto:lookit-research@mit.edu" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" class="">lookit-research@mit.edu</a><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class="">
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