Latency recorded as zero


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NatalieM
NatalieM
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I have an attention task where a background video is playing and participants are asked to respond to '+' appearing on either right or left side of video with varying post trial pauses. The problem is that when I look at pilot data the latencies are usually recorded as 2000 (which I have set as response timeout). I am using a MacBook Air to run these tasks and I am wondering if it either a code problem OR that my computer is not powerful enough to record responses and deal with the background video at the same time. Help is most appreciated!!

Here's the code:

<trial middleleft_2>
/stimulustimes = [0 = middleleft; 500 = erasemiddleleft]
/correctresponse = ("Z")
/validresponse= ("Z", "/")
/posttrialpause = 2000
/response = timeout(2000)
</trial>

<trial middleleft_3>
/stimulustimes = [0 = middleleft; 500 = erasemiddleleft]
/correctresponse = ("Z")
/validresponse= ("Z", "/")
/posttrialpause = 3000
/response = timeout(2000)
</trial>

<trial middleleft_4>
/stimulustimes = [0 = middleleft; 500 = erasemiddleleft]
/correctresponse = ("Z")
/validresponse= ("Z", "/")
/posttrialpause = 4000
/response = timeout(2000)
</trial>

<trial middleright_2>
/stimulustimes = [0 = middleright; 500 = erasemiddleright]
/correctresponse = ("/")
/validresponse= ("Z", "/")
/posttrialpause = 2000
/response = timeout(2000)
</trial>

<trial middleright_3>
/stimulustimes = [0 = middleright; 500 = erasemiddleright]
/correctresponse = ("/")
/validresponse= ("Z", "/")
/posttrialpause = 3000
/response = timeout(2000)
</trial>

<trial middleright_4>
/stimulustimes = [0 = middleright; 500 = erasemiddleright]
/correctresponse = ("/")
/validresponse= ("Z", "/")
/posttrialpause = 4000
/response = timeout(2000)
</trial>

**Block**

<block FIGHT> 
/trials = [1-5 = noreplace(middleleft_2, middleright_2, middleleft_3, middleright_3, middleleft_4, middleright_4)]
/ bgstim = (Fight)
</block>

<block SIT> 
/trials = [1-5 = noreplace(middleleft_2, middleright_2, middleleft_3, middleright_3, middleleft_4, middleright_4)]
/ bgstim = (Sit)
</block>


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NatalieM - 10 Years Ago
Dave - 10 Years Ago
NatalieM - 10 Years Ago
Dave - 10 Years Ago
NatalieM - 10 Years Ago
                         Thanks for attaching the materials. I cannot find any fault with the...
Dave - 10 Years Ago
                             Problem solved! Thank-you
NatalieM - 10 Years Ago

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