He found that subjects typically used a simplifying strategy or heuristic to manage probability revision in a Bayesian decision task (Marks and Clarkson, 1972).

Marks proposed a theory that judgement involves a relation between a stimulus and a word acting as a reference point, and he followed Louis Leon Thurstone's suggestion that stimuli differ in their discriminal dispersions; see Law of comparative judgment.

Four decades later, Dawn Chen, Hongjing Lu, and Keith Holyoak (2014) confirmed Marks' theory in a computational realization by demonstrating that: "Reference points cued by the form of comparative questions systematically modulate the precision of magnitudes represented in working memory, yielding the semantic congruity effect" (Chen, Lu and Holyoak, 2014, p. 46).

With Michael Murray and colleagues, he actively promoted a critical-theoretical approach, including the foundation of the International Society of Critical Health Psychology.

This organisation has included the consideration of social justice, community approaches, and art projects to reduce health inequalities.

With Professor Peter McKellar at the University of Otago, Marks obtained funding from the Medical, now Health Research Council of New Zealand, to carry out double-anonymized, randomised controlled trials to investigate the acute effects of cannabis intoxication, e.g., "Cannabis and Temporal Disintegration in Experienced and Naive Subjects", subsequently published in Science.

A series of masters and doctoral students including Sally Casswell and Annette Beautrais submitted this research for their PhD or MSc dissertations.

Long-term homeostatic imbalances arise through genetic, environmental, or biopsychosocial mechanisms causing illness and/or loss of well-being.

Overconsumption of high-calorie, low-nutrient foods, combined with stressful living and working conditions, have caused imbalances in homeostasis, overweight, and obesity in more than two billion people.

Annunziato and Grossman (2016)[2] explain that Marks' homeostasis theory attributes the obesity imbalance to a "Circle of Discontent", a system of feedback loops linking weight gain, body dissatisfaction, negative affect, and overconsumption.

Annunziato and Grossman (2016) indicate that the homeostasis theory focuses on five feedback loops that form an insidious and vicious "Circle of Discontent".

The authors explain that Marks (2015) proposes a four-armed strategy to halt the obesity epidemic consists of (1) putting a stop to victim-blaming, stigma, and discrimination; (2) devalorizing the thin-ideal; (3) reducing consumption of energy-dense, low-nutrient foods, and drinks; and (4) improving access to plant-based diets.

Annunziato and Grossman (2016) concluded: "If fully implemented, interventions designed to restore homeostasis have the potential to halt the obesity epidemic".

Recently, Cui et al. (2007) found that reported image vividness correlates with increased activity in the visual cortex.

This study shows that increased visual cortical activity reflects the subjective experience of forming a mental image.

Logie, Pernet, Buonocore, and Della Sala (2011) used behavioural and fMRI data for mental rotation from individuals reporting vivid and poor imagery on the VVIQ.

Lee, Kravitz, and Baker (2012) used fMRI and multi-voxel pattern analysis to investigate the specificity, distribution, and similarity of information for individual seen and imagined objects.

Marks subsequently published an article in Nature demonstrating that the original claims of remote viewing experiments were based on flawed experimental procedures.

2000; co-authored with the late Richard Kammann; forewords to both editions by Martin Gardner) that Uri Geller was able to hoodwink scientists, journalists and the many members of the public with a series of simple but audacious sleights of hand.

Marks became convinced that the leading members of the Committee for Skeptical Inquiry such as Ray Hyman, Paul Kurtz and James Randi were actually "pseudoskeptics", i.e. disbelievers, who were never open to the possibility of the paranormal in the first place.

Such a challenge obviously goes against all the ethos and efforts of academic parapsychology at UK Universities, such as Northampton, which follow the basic belief of Joseph Banks Rhine that by piecing together numerous factors and personality- traits, a degree of control over psi can eventually be achieved.

Marks's challenge also goes against my own efforts to show that altered states of consciousness are the royal road to reliably reproducing lifting psi-in-the-wild to psi-in-the-lab.

In 2010, David Marks systematically analysed the association between literacy skills and intelligence quotient(IQ) across time, nationality, and race.

Kaufman described how Marks tested these predictions by looking at samples representative of whole populations (rather than individuals) and used ecological methods to compute statistical associations between IQ and literacy rates across different countries.

In embracing intentionality, purpose, and desire, the GTB is non-reductive while, at the same time, drawing upon principles from other sciences, in particular, Biology and Physiology.

Following Claude Bernard, Walter B. Cannon, and others, David Marks advocates the usefulness of the concept of 'Psychological Homeostasis' and explains the implications for the Science of Behaviour.