Why we think slower in the heat and work less at work

Extreme heat has become a growing concern in urban areas, with temperatures soaring to levels that make indoor living uncomfortable and even dangerous. In recent days, residents have been forced to seek alternative ways to cope with the sweltering conditions, including sleeping on balconies to escape the oppressive heat inside their apartments. This trend highlights the increasing impact of climate change on daily life, particularly in densely populated cities where heat retention is exacerbated by concrete surfaces and limited green spaces. The phenomenon of extreme heat affecting cognitive performance has been well documented in scientific studies. Research conducted during the summer of 2016 by a team at Harvard T.H. Chan School of Public Health found that individuals exposed to high temperatures performed significantly worse on concentration tests and simple arithmetic tasks compared to those who had access to air conditioning. The study observed 44 students over twelve days in Boston, revealing that those without cooling systems showed a decline of approximately 13 percent in their test results. Even after the heatwave subsided, the effects lingered as homes remained warm, further impairing mental function. The physiological response to heat is complex and involves multiple systems within the body. A study published in March by researchers at the Hong Kong Polytechnic University examined how heat affects brain activity. Twenty middle-aged workers regularly exposed to heat were placed in a climate chamber and asked to complete six cognitive tasks under varying temperature conditions. The findings indicated that while routine tasks could still be managed in hot environments, more complex challenges required greater neural effort. Electroencephalogram readings revealed that participants needed to activate broader networks of neurons to maintain performance levels, suggesting that the brain works harder rather than less in the heat. This increased demand on the brain's resources can lead to fatigue and reduced efficiency. According to psychologist Susanne Fischer from the University of Zurich, the body’s efforts to regulate temperature through sweating and increased blood flow to the skin divert resources away from cognitive functions such as concentration, memory, and emotional regulation. Additionally, the brain's ability to cool itself and receive adequate oxygen becomes compromised, disrupting neurotransmitter balance and affecting motivation and mood. These effects begin to manifest at around 25 degrees Celsius, leading to a noticeable decline in cognitive performance. Economic implications of this decline in productivity due to heat are significant. Klaus Weyerstraß, an economist at the Institute for Advanced Studies in Vienna, has calculated the financial cost of reduced productivity caused by rising temperatures. His research models the economic consequences based on climate scenarios up to 2070. Under the worst-case scenario, which Weyerstraß notes is becoming increasingly plausible, Austria could lose approximately 3.6 billion euros annually in economic output due to decreased human productivity. As the frequency and intensity of heatwaves increase, the need for adaptive strategies becomes more urgent. Individuals are exploring unconventional methods to stay comfortable, such as using balconies as temporary sleeping quarters. While these measures provide immediate relief, they underscore the broader challenge of addressing the long-term impacts of climate change on public health and economic stability. The situation calls for comprehensive policies aimed at mitigating urban heat islands and enhancing resilience against extreme weather events.