How Many Citta Can Arise in a Second?

I may have given a wrong impression.

I have no doubts that a mind is much faster than any computer. In fact, it is entirely possible that when fully in the “monodvara“, there can indeed be billions of citta flowing in the mind. This happens when one is in a jhana samapatti (where the jhana citta flows without interruption) or phala samapatti (where the phala citta flows without interruption).

However, when a sense input comes through one of the five PHYSICAL sense faculties (eyes,ears,nose, tongue, and the body), that signal has to be first processed by the brain, as I discussed : “Brain – Interface between Mind and Body“.

According to the scientists, it takes times of the order of milliseconds (thousandth of a second) to process such signals. In the recent post, “Amazingly Fast Time Evolution of a Thought (Citta)“, I in fact showed that the process in the “monodvara” must be very fast (matching with billions of citta per second).

So, basically I would like to see some reference in the Tipitaka about how fast these pancdvara citta vithi can be.
– To put it in another way, is there a mention in the Tipitaka how many manodvara EVENTS can take place per second? The 17 citta within that citta vithi is likely to flow at the rate of billions of citta per second.

There is no way that any single person can read and understand the whole Tipitaka. I have no problem of having faith in what Waharaka Thero taught, because it is all self-consistent. I started reading the suttas only in 2017, after the Parinibbana of the Waharaka Thero, and I have not seen a single piece of contradiction yet.

It is just that when an intriguing point like this comes up, it is good to find out more details from the Tipitaka if possible.

It is also possible that there is no specific mention of these processes in detail in the Tipitaka. It is impossible to describe all the details, especially since the Tipitaka was designed to be transmitted orally and was transmitted orally for several hundred years, before it was written down.

One more point: It is also not necessary to learn all these details about how the mind works, in order to attain any magga phala. If one can grasp the anicca, dukkha, anatta nature, that is all that is needed.
– But another goal that I have is to get a complete description of these “mind processes” as much as possible. It is fascinating, and it shows how deep Buddha Dhamma can go. It will help generating true faith in some people, who are not “saddhanusari“.
– All these descriptions probably are boring for “saddhanusari“.

I found a sutta where the Buddha says it is hard to find any phenomena in this world that changes faster than the mind: “Aṅguttara Nikāya (1.48)“.

The short sutta says: “Nāhaṃ, bhikkhave, aññaṃ ekadhammampi samanupassāmi yaṃ evaṃ lahuparivattaṃ yathayidaṃ cittaṃ. Yāvañcidaṃ, bhikkhave, upamāpi na sukarā yāva lahuparivattaṃ cittan”ti.”

Translated: “I consider, bhikkhus, that there is no phenomenon that comes and goes so quickly as citta. It is not easy to find an analogy (a simile) to show how quickly citta can change.”

Modern science says there are many things that occur in the femto-second time scale. That is million billion times per second. So, citta could change faster than that, and therefore those quotations are correct regarding how fast citta can arise.

Dr.J Chakma said: “1) There can be approximately 600 citta vithi per second if all six senses are actively working, followed by 1800 manodvara citta vithi (3 mind door citta vithi follows every sense door citta vithi). Because human brain takes approximately 10 millisecond to process a sense input. ”

That is true in the case of pancadvara citta vithi. The “time lag” of approximately 10 milliseconds takes for the brain to process a signal coming though the five physical senses. However, the time lag could be smaller, since the brain may be able to process signals coming from the five physical senses in parallel. So, the time lag could be smaller by a factor of two. In any case, these are estimates based on current scientific findings. The actual numbers could change.

Regarding #2: While the brain is processing those external signals, the mind could be in a bhavanga state or in an active manodvara state. It is a complex situation.

The only thing we can say with certainty is that the mind — at a given time instant — will be in just one of the following states: processing a pancadvara citta vithi, processing a manodvara citta vithi, or in a bhavanga state.

Jhana (or phala) samapatti is a special case, where a single manodvara citta vithi can run uninterrupted for hours.