Used Studies

Basis for the exponential decay model, the “stability” parameters, half-lives, the spacing effect and the reactivation windows.

1. Ebbinghaus, H. — On Memory: the classic forgetting curve (reprint)
2. Murre, J. M. J. & Dros, J. (2015) — Replication and Analysis of Ebbinghaus’ Forgetting Curve, PLOS ONE
3. Wixted, J. T. & Ebbesen, E. B. (1997) — Genuine power curves in forgetting
4. Murre, J. M. J. & Chessa, A. G. (2011) — Power laws from averaging over individual exponential forgetting curves
5. Wixted, J. T. (2004) — The psychology and neuroscience of forgetting
6. Cepeda, N. J. et al. (2006) — Distributed practice / the spacing effect: a meta-analysis of 317 experiments
7. Cepeda, N. J. et al. (2008) — Optimizing distributed practice (over 1,350 participants)
8. Cepeda et al. (2008) — Spacing effects in learning (the temporal ridgeline)
9. Bahrick, H. P. & Hall, L. K. (2005) — The importance of retrieval failures to long-term retention
10. Bahrick, H. P. — Fifty years of memory for names and faces (the permastore)
11. Maddox, G. B. et al. (2015) — Spacing and testing effects / retrieval difficulty
12. Craik, F. I. M. & Tulving, E. — Depth of processing / levels-of-processing
13. Peng, P. et al. (2024) — Levels of processing in immediate and delayed recognition
14. McGaugh, J. L. (1996) — Emotional arousal and amygdala-mediated memory modulation
15. Paré, D. (2023) — Emotional memory mechanisms (review)
16. Phelps, E. A. & Sharot, T. (2008) — Emotion, vividness and subjective memory
17. Hirst, W. & Phelps, E. A. (2016) — Flashbulb memories
18. Pantelis, P. C. et al. (2008) — Distinctiveness and interference in face memory
19. Kramer, R. S. S. (2021) — Forgetting newly learned faces (570 participants, first 24 hours)
20. Paller, K. A. et al. (2003) — Person recognition and person-specific information
21. MacKenzie, G. & Donaldson, D. I. (2016) — Person identification vs. face recognition
22. Brédart, S. (2018) — The fragility of proper names in memory (review)
23. James, L. E. et al. (2008) — Face–occupation vs. face–name associations
24. Fogler, K. A. & James, L. E. (2010) — Learning descriptive vs. non-descriptive names
25. Hamilton, L. J. & Krendl, A. C. (2023) — Social cognition and face–name memory
26. Klein, S. B. et al. (2009) — The social functions of episodic memory
27. Georgiou, A. et al. (2023) — Separating acquisition, retention and retrieval in memory

Additional consolidation research: Squire et al. (2015); “The Yin and Yang of memory consolidation”; time-dependent consolidation in distributed learning.

Basis for the definition of relationship strength, the importance bands, Dunbar layers, the reactivation of dormant contacts and the value of weak and strong ties.

28. Granovetter, M. S. (1973) — The Strength of Weak Ties, American Journal of Sociology
29. Marsden, P. V. & Campbell, K. E. (2012) — Reflections on Conceptualizing and Measuring Tie Strength, Social Forces
30. Marsden, P. V. & Campbell, K. E. (1984) — Measuring Tie Strength, Social Forces
31. Levin, D. Z., Walter, J. & Murnighan, J. K. (2011) — Dormant Ties: The Value of Reconnecting
32. Levin, Walter & Murnighan — How to Reconnect for Maximum Impact, MIT Sloan Management Review
33. Roberts, S. G. B. & Dunbar, R. I. M. (2015) — Managing relationship decay
34. Hill, R. A. & Dunbar, R. I. M. (2003) — Social network size in humans
35. Miritello, G. et al. — Time as a limited resource: communication strategy in social networks
36. Tamarit, I. et al. — Cognitive resource allocation and Dunbar circles
37. Onnela, J.-P. et al. — Structure and tie strengths in mobile communication networks
38. Aiello, L. M., Joglekar, S. & Quercia, D. — Multidimensional tie-strength analysis
39. Mattie, H. et al. — Social network structure and relationship dynamics
40. Burt, R. S. — Structural Holes (chapter)
41. Wellman, B. & Wortley, S. (1990) — Different Strokes from Different Folks: Community Ties and Social Support
42. Hall, J. A. & Baym, N. K. (2012) — Calling & texting: (hyper)coordination and friendship maintenance
43. Tie-strength study — Science (2022): a weak-ties field experiment
44. Scientific Reports (2023) — network and tie-strength analysis
45. Dunbar layers — the fractal structure of social networks (arXiv)
46. Relationship-maintenance study — Personal Relationships

Basis for the interaction weights (like < comment < message < call < meeting), channel depth (DEPTH_RANK), reciprocity factors and the cross-channel sequence bonus.

47. Daft, R. L. & Lengel, R. H. (1986) — Media Richness Theory, Management Science
48. Dennis, A. R., Fuller, R. M. & Valacich, J. S. (2008) — Media Synchronicity Theory, MIS Quarterly
49. Walther, J. B. (1996) — Computer-Mediated Communication / the Hyperpersonal Model
50. Burke, M. & Kraut, R. E. — Communication and relationship strength on social platforms
51. Scissors, L., Burke, M. & Wengrovitz, S. — What’s in a Like?
52. Bos, N. et al. — Effects of four computer-mediated channels on trust development
53. Kumar, A. & Epley, N. (2021) — It’s Surprisingly Nice to Hear You: voice and connection
54. Schroeder, J., Kardas, M. & Epley, N. — The Humanizing Voice
55. “They Like to Hear My Voice” — a voice-message study, MobileHCI 2020
56. Channel Expansion Theory — an empirical test
57. Social Information Processing Theory — Wiley SIP encyclopedia entry
58. Social Presence — a review, JCMC
59. Media Configurations — JCMC
60. Social Presence — conceptualization
61. Handshaking promotes deal-making — Harvard Business School
62. Oxytocin & Trust
63. Social bonding — a review
64. Ambient Awareness — passive salience through social media
65. Virtual Work Meetings
66. Job interview / communication-mode meta-analysis — Journal of Organizational Behavior
67. LinkedIn Trust Study

On the nonverbal / channel debate we also drew on the Lapakko critique, a SAGE reciprocity study and Cogent Engineering (2022).

Not peer-reviewed, but used to calibrate the contact cadences and health scores in practice.