Decisions Decisions

A new study reported on in Science Daily suggests that complex decision making occurs in at least one single celled organism. 1

Perhaps our first thoughts when considering single celled organisms is that they are primitive relics of the past with simple physiologies and perhaps only programmed behaviors. However we must consider the simple fact that for several billions of years single cell organisms lived and thrived on the planet and evolved into innumerable species and eventually into multicellular organisms.

Recently a team of researches at Harvard Medical School replicated a century old experiment demonstrating   that  Stentor roeselii  exhibits a complex hierarchy of avoidance behaviors. The evolutionary advantage for the development of this complex avoidance behavior in Stentor roeselii can only be hypothesized but the authors offer this speculation in the paper:

“Such behavioral complexity may have had an evolutionary advantage in protist ecosystems, and the ciliate cortex may have provided mechanisms for implementing such behavior prior to the emergence of multicellularity.”  2

This is an interesting article not only for demonstrating that life, in all it’s forms, may exhibit behaviors we have yet to document but also for the fact that there may be great scientific value in replicating  other forgotten studies from decades past.

Additionally, studies like this one make it clearer that all life is indeed life — and that– is something worth pondering.


  1. Harvard Medical School. (2019, December 5). New study hints at complex decision making in a single-cell organism. ScienceDaily. Retrieved December 11, 2019 from
  2. Joseph P. Dexter, Sudhakaran Prabakaran, Jeremy Gunawardena. A Complex Hierarchy of Avoidance Behaviors in a Single-Cell Eukaryote. Current Biology, 2019; DOI: 10.1016/j.cub.2019.10.059


feedback welcome

Please log in using one of these methods to post your comment: Logo

You are commenting using your account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s