# FSRS 5: Ideas and Sims

**URL:** <https://forums.ankiweb.net/t/fsrs-5-ideas-and-sims/51278>\
**Category:** FSRS\
**Created:** [October 28, 2024, 8:00am UTC](https://forums.ankiweb.net/t/fsrs-5-ideas-and-sims/51278 "2024-10-28T08:00:50Z")\
**Posts on this page:** 1\
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**Author:** ![DerIshmaelite](https://sea2.discourse-cdn.com/flex002/user_avatar/forums.ankiweb.net/derishmaelite/32/17983_2.png) [@DerIshmaelite](https://forums.ankiweb.net/u/DerIshmaelite)\
**Post date:** [October 28, 2024, 12:08pm UTC](https://forums.ankiweb.net/t/fsrs-5-ideas-and-sims/51278/5 "2024-10-28T12:08:55Z")

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I think that the size of the collection and the rate at which it grows (number of new cards per day) influences the retention of older learned cards.

**New cards interfere with retention of older cards** → Retroactive Inhibition

[Retroactive inhibition | psychology | Britannica](https://www.britannica.com/science/retroactive-inhibition)

[Learning theory - Stages, Acquisition, Retention | Britannica](https://www.britannica.com/science/learning-theory/Stages-of-learning#ref586992)

This also applies in the opposite direction.

**Older cards interfere with learning of new cards** → Anterograde Inhibition

 ![image](https://us1.discourse-cdn.com/flex002/uploads/anki2/original/3X/7/b/7bfe9a5aeb1891f1782ca4fc15cb28d24787d127.png)

So I believe that **collection size (Older cards)** and **Number of New Cards per day** are variables that should be looked into.

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