The title is a rhetorical intensification — the research supports “significantly influences subsequent decisions throughout the day,” not absolute determination. What it does establish is specific enough to be practically useful: the emotional state you bring to the start of your working day systematically biases what information you retrieve, how you interpret ambiguous signals, and what conclusions feel most warranted. And the mechanism runs beneath conscious awareness.

Emotions get misattributed as information about decisions

Norbert Schwarz and Gerald Clore’s 1983 research at the University of Michigan produced one of the most elegant demonstrations in social psychology. Participants were asked to rate their life satisfaction. Those who happened to be called on sunny days rated it higher than those called on rainy days. The researchers then ran a version where the interviewer first mentioned the weather casually before asking the life satisfaction question. The effect disappeared. When participants became aware that their mood had an irrelevant source, they discounted it. When they were not aware, the incidental mood shaped their evaluations as if it were genuine information about their lives.

This is affect-as-information theory — the finding that emotional state is not experienced as background noise but as apparent information about whatever is being evaluated. The candidate who arrives at a hiring interview after a frustrating morning does not think “my frustration is affecting my judgement.” They think “this candidate seems less impressive than I expected.” The negative affect has been misattributed to the candidate as if it were evidence about them.

Mood shapes what you can see

Gordon Bower’s foundational 1981 research at Stanford established the mood congruency effect — emotional state systematically biases memory retrieval toward emotionally congruent material. A founder evaluating a strategic option in a negative emotional state retrieves more examples of failure, weights competitive threats more heavily, and finds downside scenarios more salient — not because the evidence is actually more negative but because the retrieval process is mood-filtered.

This does not feel like bias from the inside. It feels like careful, evidence-based evaluation. The negative examples feel relevant. The caution feels warranted. The problem is that the evidence being weighted is a mood-congruent subset of available information, not a representative sample of it.

The same strategic option evaluated on a difficult Tuesday morning and a positive Friday morning is not being evaluated equally. The emotional state is not irrelevant noise around the decision — it is shaping what counts as evidence within it.

A founder in a negative emotional state is not seeing the decision more clearly than usual. They are seeing a mood-congruent version of it.

The circadian emotional curve

Bu and colleagues’ 2025 study in PMC, drawing on nearly one million observations, found that positive affect is highest in the morning and declines through the day, with negative affect lowest in the morning and increasing through the afternoon, peaking around midnight. This pattern was consistent across studies using both social media data and direct experience-sampling methods.

This circadian curve interacts directly with the affect-as-information mechanism. Decisions made in the late morning occur against a backdrop of higher positive affect and greater emotional stability. The same decisions made in the late afternoon occur against lower positive affect, accumulated decision fatigue, and higher emotional reactivity. The emotional state is being misattributed to the decision object in both cases — but the misattribution produces systematically different evaluations.

The practical implication is decision architecture. High-stakes decisions — hiring evaluations, investor conversations, strategic reviews — should be scheduled during the window when emotional state is most stable and positive affect is highest. For most people, this is the late morning. The late afternoon is the window when the combination of declining positive affect and accumulated cognitive fatigue most degrades the quality of evaluation.

If the pattern described here maps onto something more persistent — a baseline emotional state that consistently colours how opportunities look, or difficulty accessing positive affect regardless of time of day — that is worth exploring with a professional. The circadian curve is a normal human pattern. A consistently negative baseline beneath it is a different conversation, and one that benefits from more than schedule adjustments.

The practical intervention

Before any high-stakes evaluation, two questions counteract the misattribution mechanism. What is my current emotional state? And does it reflect information about this decision, or does it reflect something else entirely?

The second question is the one most people skip. Identifying that you feel frustrated or anxious is straightforward. Identifying that the frustration came from a conversation two hours ago — and is currently being misattributed to the candidate sitting in front of you — requires the deliberate pause that the misattribution mechanism specifically bypasses.

Rothbard and Wilk’s 2011 research in the Academy of Management Journal, examining workplace morning mood carry-over, found that start-of-workday mood systematically predicted affect and performance throughout the day. The morning emotional state is not merely a starting point — it is a frame through which subsequent events are interpreted and weighted.

The objective is to be self aware of your emotional state during the mornings, and to understand that the decisions you will be making will be influenced by the state of your mood. Once you realise this, you can alter your mornings in a way where it feels more fulfilling, and less depressive. What you do to change that is up to you.

A book worth reading alongside this

Emotional Agility by Susan David provides the most directly applicable framework for the misattribution mechanism. David’s research-backed distinction between being hooked by emotions — treating them as accurate information about the world — and observing them at psychological distance maps precisely onto the Schwarz and Clore correction. Her practical framework for labelling emotional states rather than suppressing or acting on them is the most direct applied intervention for what this article describes.

This article discusses psychological patterns documented in research on affect, cognition, and decision-making. It is not designed to identify, diagnose, or assess any psychological condition, and it is not a substitute for professional support. The patterns described here are well-documented features of human cognition — recognising yourself in them is not a cause for alarm. If, however, persistent low mood or emotional difficulties are significantly affecting your work or wellbeing, speaking with a psychologist can provide personalised support that an article cannot.

This article is for educational and informational purposes only. It is not a substitute for professional psychological advice, diagnosis, or treatment. If you are experiencing significant psychological distress, please consult a qualified mental health professional.

Sources: Schwarz, N. & Clore, G.L. (1983), Journal of Personality and Social Psychology, 45(3). Bower, G.H. (1981), American Psychologist, 36(2). Bu, F. et al. (2025), PMC, nearly 1 million observations. Rothbard, N.P. & Wilk, S.L. (2011), Academy of Management Journal, 54(5). Forgas, J.P. (1995), Psychological Bulletin, 117(1).