Tag Archives: free recall


Modeling individual differences in free recall

Building off of, and incorporating, my previous work on individual differences in memory dynamics (as measured by a large-scale free-recall experiment known as PEERS), I am currently starting to work with the CML’s model of memory and temporal context known as CMR, the Context Maintenance and Retrieval model.

Generally, along with Dr. Karl Healey, I am working on fitting the model to each individual PEERS subject using a genetic algorithm. We will then examine the best-fit parameters for each subject for correlation with other behavioral measures and with the four factors discovered before. We will also see if any of the model parameters, or some combination thereof, are strongly predictive of general intelligence.


PyEPL implementation of WMS/CVLT

Porting standardized tests of memory, mood, and personality into Python-based Experiment Programming Library (PyEPL: Geller et al. 2007; publicationproject page) in support of project Individual differences in free recall.

Tests included:

  1. Wechsler Memory Scale
  2. California Verbal Learning Test
  3. NEO-FFI
  4. PANAS-X
  5. SDFMS
  6. SWLS
  7. PSWQ

Personality/mood tests (3-7) used code written by Jonathan Miller.


Individual differences in free recall

I am leveraging a large dataset of free recall and recognition memory (known as PEERS) to investigate the correlational structure of several behavioral measures of free recall. In particular, I am interested in investigating the oft-found correlation between memory performance (recall probability) and fluid intelligence (IQ).

I presented preliminary findings at the Meeting for the Society for Mathematical Psychology in Summer 2012. (My poster can be found here.)

I later incorporated factor analysis into my investigation, and found four factors that underlie recall dynamics and can predict probability of recall to a high degree (accounted for 83% of variability), even though none of the features that went into factor analysis reflected recall success. Furthermore, the four recall dynamics factors can significantly predict IQ. This result has been written up with Karl Healey and Michael Kahana and is under review at JEP: General. (A PDF of its current state may be found here.)

I also presented this result (plus some extensions) in a poster at the 2013 Context and Episodic Memory Symposium. The poster can be seen here, or below.


Moved to “Completed” pending acceptance/minor revisions (fingers crossed).