How does the Forgetting curve change after repeated exposure to the same item we would like to memorise? - Psychology & Neuroscience Stack Exchange most recent 30 from psychology.stackexchange.com 2019-06-19T21:59:53Z https://psychology.stackexchange.com/feeds/question/15705 http://www.creativecommons.org/licenses/by-sa/3.0/rdf https://psychology.stackexchange.com/q/15705 8 How does the Forgetting curve change after repeated exposure to the same item we would like to memorise? FloriOn https://psychology.stackexchange.com/users/8768 2016-08-15T08:01:46Z 2019-05-14T20:03:05Z <p>There has been a long debate going on on the actual form of the <em>Forgetting curve</em>, but my question will be about its change when we review a previously memorised fact - Unfortunately, I couldn't seem to find too much information (or perhaps I used wrong terms) on this topic.</p> <p>Maybe the most up-to-date and least divisive research paper on the topic of the actual form of the Forgetting curve would be <em>Averell, L., &amp; Heathcote, A. (2011). The form of the forgetting curve and the fate of memories. Journal of Mathematical Psychology</em>, which I have seen referenced here multiple times. According to it the shape of the curve is best described as \$\$R(t) = a + (1-a)*b*(1+t)^{-β}\$\$ which would yield \$1\$ at \$t=0\$ if the encoding happened without a problem (which we assume did). My concrete question would be that how the three parameter change after repeated exposure to the fact (where we assume that at this specific \$t_r\$ the retention increases to \$1\$ again). I think it is fair to assume that it is going to be yet another curve describable with a Power function starting at \$t_r\$ which should have a higher asymptote as the original function.</p> <p>A picture (although not scientific nor correct in terms of the actual form) illustrating my question has been already posted here at <a href="https://cogsci.stackexchange.com/questions/8377/how-are-these-review-forgetting-curve-calculated">How are these review-forgetting curve calculated?</a>, although for different purposes than mine.</p> https://psychology.stackexchange.com/questions/15705/-/21309#21309 0 Answer by George Boole for How does the Forgetting curve change after repeated exposure to the same item we would like to memorise? George Boole https://psychology.stackexchange.com/users/21059 2018-12-15T18:13:18Z 2018-12-15T18:13:18Z <p>Currently, I am working on various demonstration graphs of various spacing effect algorithms. From the research it seems like two of the parameters exist to constrain the outputted values...</p> <blockquote> <p>The parameters a and b are also assumed bounded between zero and one, and hence R(t) is similarly bounded, which must necessarily be the case as R(t) is a probability. Enforcing this bound is important as otherwise data fits can be inflated (see Navarro, Pitt, &amp; Myung, 2004, for further discussion).</p> </blockquote> <p>I think Ebbinghaus' original function R(t) = e ^ -(t/s) (see this <a href="https://psychology.stackexchange.com/questions/5199/which-equation-is-ebbinghauss-forgetting-curve-and-what-do-the-constants-repres?rq=1">thread</a>) can more easily explain things. t is time and s is the strength of the memory. After every review, s increases. If you plot this out, you see that if you increase s, the forgetting curve function flattens out.</p>